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V.A.G 1552
Vehicle
System Tester
Information for self-diagnosis
Operating Instructions
Contents
Page
1. At a glance```````````````````````````````````````````````````````````4
2. For what do you need a new diagnosis system?``````````````5
3. Description of the tester```````````````````````````````````````````6
4. What is “self-diagnosis”?`````````````````````````````````````````7
5. How doer self-diagnosis operate?```````````````````````````````8
How is it performed?
6. How can you operate the unit?``````````````````````````````````11
6.1. Changing the program card`````````````````````````````````11
6.2. Connecting the tester:`````````````````````````````````````````12
6.2.1. With diagnostic cable V.A.G 1551/1 (with fault finding)```12
6.2.2. With diagnostic cable V.A.G 1551/3 (with fault finding)```14
6.3. The operating modes which you can select:`````````````````````16
6.3.1. Operating mode 1 – Vehicle system test``````````````````````````17
6.3.1.1. Description of the functions```````````````````````````````````````20
6.3.1.1.1. 01 – Interrogating control unit version````````````````````````20
6.3.1.1.2. 02 – Interrogating fault memory````````````````````````````````21
6.3.1.1.3. 03 – Final control diagnosis``````````````````````````````````````21
6.3.1.1.4. 04 – Basic setting```````````````````````````````````````````````````21
6.3.1.1.5. 05 – Erasing fault memory```````````````````````````````````````23
6.3.1.1.6. 06 – Ending output````````````````````````````````````````````````23
6.3.1.1.7. 07 – Coding control unit``````````````````````````````````````````23
6.3.1.1.8. 08 – Reading measuring value block```````````````````````````24
6.3.1.1.9. 09 – Reading individual measuring value`````````````````````26
6.3.1.1.10. 10 – Adaptation```````````````````````````````````````````````````26
6.3.2. Operating mode 3 – Self-test`````````````````````````````````````````29
6.3.3. Operating mode 4 – Dealership number```````````````````````````30
7. Warranty/Service```````````````````````````````````````````````````````````32
8. Technical data```````````````````````````````````````````````````````````````33
9. Replacement parts`````````````````````````````````````````````````````````34
10. Subject index and what the terms mean`````````````````````````````35
Fig. 1: Tester and diagnostic cables
1. At a glance
1. Display: Here you can read off the data which the unit outputs.
2. Socket for connecting diagnostic cable (the diagnostic cable is the connection cable between tester and vehicle)
3. Covers for program card and the RS 422 interface
4. Diagnostic cables
4a V.A.G 1551/3 for vehicles with 16-pin diagnostic connection
4b V.A.G 1551/1 for vehicles with 2-pin diagnostic connection
5. Keyboard
O to 9 Keys for numerical entries
C You can use this key to erase entries, return to the previous operating level or to interrupt a program in operation.
Q You can use this key to perform (confirm) entries
→ You can use this key to move forward within the program or the text.
↑and↓ You can use these keys to change the adaptation values in function 10 “Adaptation” (Chapter 6.3.1.1.10.) or can run through the measuring value blocks in function 04 “Basic setting” (Chapter 6.3.1.1.4.) and in function 08 “Read measuring value block” (Chapter 6.3.1.1.8.).
HELP You can retrieve additional operating information by pressing the HELP key
2. For what do you need a new diagnosis system?
The Volkswagen Group is constantly endeavouring to meet increasing customer expectations, but also to comply with stricter legal requirements in respect of safety and environmental compatibility. We are therefore constantly improving the functions of our vehicles and introducing new functions. The intrinsic complexity of these systems in the vehicle necessitates constantly monitoring them if they are to operate fault-free. This is done with the aid of diagnostic systems which include indications on the instrument panel which inform the driver of functions which are restricted or which have failed, but also, in particular, testers such as the
V.A.G 1552 Vehicle System Tester. The V.A.G 1552 is intended to assist you in fault finding and in rectifying faults.
The V.A.G 1552 has the benefit of being very compact and
light enabling you to use it without problems in the vehicle. If you wish to use the V.A.G 1552 when driving, you then should
take a second person with you to observe the tester.
Before explaining the functions of the tester (see Chapter4-6),
We should like to first of all describe to you the visible parts
of the unit.
3． Description of the tester
The tester consists of two parts:
a) the swiveling top half of the housing,
b) the bottom half of the housing.
Re a) the top half of the housing contains the illuminated display (data output display) with 2 lines, each line displaying up to 40 characters. This is where the information appears. The numerous functions of the tester are also displayed here.
The top half of the housing ( the cover) can be locked in different positions. It is therefore possible for you adjust so that you can read the data conveniently.
Re b) the bottom half of the housing contains the keys with which you are able to operated the tester.
The bottom half also contains the slot for the program card (behind the cover; 3). All the function of the tester are controlled with this program card; the card can be replaced by a different one. This is done, for example, if the function of the tester are enlarged as a result of new developments. The program card can be supplied in different languages. The socket（see 2 in figure）on the side of the tester is for the power supply as well as the data interchange with the control units. The diagnostic cable (see 4a or 4b) links the tester to the diagnostic connection in the vehicle. The cover (3 in Fig.) also conceals an RS-422 interface. This interface enables you to connect the tester to the interface splitter in the tester trolley V.A,G 1700, enabling you to tie into ongoing processes in place of the fault reader V.A.G 1551.
In addition, the control unit activates the following system functions, which are also dependent on the temperature:
-the knock control
-the adaptation of the idle speed cylinder charge control
-the lambda control and
-the fuel tank ventilation system.
How does the sender operate? The measuring element of the sender is an NTC resistor. An NTC resistor is a thermistor which reduces its resistance as the temperature increases; in other words, the voltage at the NTC resistor decreases. As a general rule, it can be stated that each voltage at the NTC resistor corresponds to a specific temperature.
How are faults recognized and stored?
Fig. 3: Operational check and fault recognition
The measuring range is specified by the software in the control unit to the range -35℃ and 120℃. If the temperature is higher or lower, the control unit interprets this is as a faulty or implausible (i.e. unusual) signal. The fault is then stored in the fault memory of the control unit.
The data regarding fault source and fault type are stored in the fault memory. The data regarding fault source describe the component checked. The data regarding fault type provide information regarding the fault recognized – to the extent that the control unit is able to assess this. If the control unit now recognizes that a temperature signal is no longer being received, it ensures continued operation of the system by using a substitute value, e.g. 80℃..This condition is noticeable from rough running during cold starts and also during the warm-up phase. If the fault occurs only briefly, it is identified as a sporadic fault (/SP). The faulty signal is only regarded and stored as a “permanent fault” if it remains present for a specified period of time.
4. What is “self-diagnosis”?
Traditional methods of fault finding are extremely time-consuming. They involve having to disconnect several plug connections on the electronic systems in order to test operations or components using various involved procedures. This did make it possible to rectify faults (such as loose contacts or corroded connectors), although such faults often re-occurred after a short time. In addition, these methods can give rise to new faults, e.g. bent contact pins or cable breaks.
Microprocessor-controlled vehicle systems with self-diagnosis offer a number of benefits contrast to such methods:
- They monitor and check the sensor signals, the control unit function and the control elements continuously
- They perform protective functions which prevent e.g. a fault in engine operation
- They permit emergency running, enabling the driver to still reach the workshop even if the sensors have failed.
As the faults recognized are stored in the control unit, it was a logical development to also make use of this fault information for troubleshooting in the workshop. We have therefore created a diagnostic interface which enables information to be transferred between control unit and tester. The information flow is possible in both directions. This means the tester cannot only receive data but can also transmit data and commands to the control unit.
The Vehicle System Tester V.A.G 1552 which we have developed is intended to thus assist you in a simple manner in service and repair work, in fault finding and rectifying faults. The diagnosis system, together with the accompanying literature, helps you to locate faults much more quickly, to enhance the reliability of the repair work performed and thus to reduce repair costs.
5. How does self-diagnosis operate?
How is it performed?
All the electronic systems in a vehicle are identically structured: The system’s sensors supply information to the control unit regarding the operating state of the vehicle at that moment. The control unit processes this information and forms from this signals for controlling the system’s control elements is now monitored?
Let us illustrate this by taking an example of the coolant temperature sender G 62 on an engine management system.
Fig. 2: Diagram of engine management system
What is the task of the coolant temperature sender G 62?
The engine has to run smoothly, also when idling; it must also start easily, even when cold; and finally combustion must function optimally. The control unit requires information regarding the engine temperature if these functions are to be performed properly. This is the information which is supplied by the coolant temperature sender G 62.
The sender projects into the coolant where it measures the temperature corresponding to the engine temperature, and passes this information to the control unit. The control unit determines the most favourable values for the ignition angle, for injection timing and for idle speed stabilization and passes these to the control elements.
6. How can you operate the tester?
We provide you information on the following pages regarding three operations:
- Changing the program card (Chapter 6.1.)
- Connecting the tester (Chapter 6.2.) and
- The operating modes which you can select (Section 6.3.)
6.1. Changing the program card
All the functions of the tester are controlled by the software of the program card. The program card is the size of a cheque card.
When new vehicles come onto the market, the software for the tester has to be updated. The program card then has to be changed.
Caution! You must not remove or insert the program card unless the
power has been switched off, in other words when the diagnostic cable is not connected to the vehicle!! Please do not touch the contacts of the program card! And please also avoid static charges!
Please perform the following steps to change the program card:
1. Remove the cover for the slot of the program card on the right-hand side of the housing (see Fig. 1, number 3). Slacken the Phillips screw for this purpose!
2. Take hold of the tab on the sticker and pill the card out to the right.
3. Insert the new program card-into the slot as far as it will go. Please ensure that you insert the card properly – this is illustrated on the sticker.
4. Now, push the tab of the sticker in and up and close the cover of the slot.
5. Switch on the power supply of the tester.
6. Select operating mode 3. The tester starts by performing a self-test (Chapter 6.3.2.). If the self-test is completed without any fault, the old program card is no longer needed.
3. Test the diagnostic cable V.A.G. 1551/3 for continuity as shown in Fig. 5b
Fig. 5b: Diagnostic cable V.A.G. 1551/3
If no readout appears in the display, this may also be caused by a soiled program card. In this case, clean the contacts of the program card with a lint-free cloth soaked in methylated spirits and re-insert the card in the slot.
6.2．Connecting the tester
The tester is equipped with a reverse polarity protection for the power supply through the diagnostic cable. Nevertheless, the input and output stages of the tester are only reliably protected if the diagnostic cable is correctly connected.
For this reason, when connecting the diagnostic cable V.A.G 1551/1 and also diagnostic cable V.A.G 1551/3, always kep to a certain sequence as follows:
6.2.1 With the diagnostic cable V.A.G 1551/1 (with fault finding):
1. Plug the black connector for the power supply of the diagnosis tester into the black flat-contact socket in the vehicle.
2. Pay attention to the readout in the display. The following next must be displayed:
Vehicle system test HELP
Enter address word XX
Once the text appears in the display, plug in the white connector.
If this readout does not appear in the display:
Do not plug in the white connector! Either the polarity of the power supply to the tester is reversed or there is no power.
3. Check the voltage at the black flat-contact socket in the vehicle (see letter A in Fig.4a) and pay attention to the polarity to avoid incorrect polarity! The power supply must be at least 10 volts (re-charge the vehicle battery, if necessary!).
Contact A1 = Battery earth (－)
Contact A2 = battery positive (＋)
Fig.4a: Connections on vehicle for power supply (A) and diagnosis (B)
4. Test the diagnostic cable V.A.G 1551/1 for continuity as shown in Fig.4b
At vehicle
Flat-contact Contact
Connector At tester
Connector-D-
Contact
Black -A- 1
2 3 Battery (－)
2 Battery (＋)
White -B- 1
2 4 L wire
1 K wire
Blue -c- 1 5 Lamp lead
Fig.4b: Diagnostic cable V.A.G 1551/1
The fault memory of the control unit does not store a text but a code (consisting of digits and letters) for the fault source and fault type. The tester reads the fault memory of the control unit, translates the code into a text and then presents it in the display.
For example, the following fault texts may be displayed:
Coolant temperature sender – G 62
Open circuit/short circuit to positive
What is the cause of this fault test?
The voltage at the input of the control unit for the temperature sensor is 5 volts. This would correspond to a temperature of less than －35℃.
There are two possible causes of this fault:
1. An open circuit in the wiring (please compare Fig. 3, number 1)
There is an open circuit in the cable. As a result of the circuitry in the control unit, the temperature sensor indicates a voltage of 5 volts.
2. A short circuit to positive (compare Fig. 3, 2)
A short circuit to positive (e.g. in the connector ) will also result in a voltage of 5 volts at the inlet of the control unit for the temperature sensor.
The control unit is not able to distinguish the two causes of the fault described above.
Coolant temperature sender – G 62
Short circuit to earth
What is the cause for this fault text?
The voltage at the input of the control unit for the temperature sensor is 0 volt. This would correspond to a temperature of more than 120℃.
The cause is a short circuit to earth (compare Fig. 3, number 3). A short circuit to earth e.g. caused by worn insulation on the connection cable) results in a voltage of 0 volt (earth) at the input of the control unit.
Please remember, however, that faults cannot be determined only by means of the fault text. It is possible for the control unit to also recognize a signal as being faulty if the fault doer not exist at the component, but at the wiring harness or at the plug connection. For this reason, the precise cause of the fault can only be determined by comparing the fault display and the fault tables of the workshop manual.
6.2.2. With the diagnostic cable V.A.G. 1551/3 (with fault finding):
1. Plug the diagnostic cable into the diagnosis connection in the vehicle.
2. Pay attention to the readout in the display. The following text must be displayed:
Vehicle system test HELP
Enter address word XX
If this readout does not appear in the display:
Check the voltage at the diagnosis connection in the vehicle according to Fig. 5a and pay attention to the polarity. The power supply must be at least 10 volts (re-charge the vehicle battery, if necessary!).
Contact 4 = Battery earth(－)
Contact 16 = Battery positive (＋)
Fig. 5a: Connection on vehicle for diagnosis
6.3.1. Operating mode 1 “Vehicle System Test”
Vehicle System Test HELP
Enter address word XX
If this operating mode is selected after connecting the tester, please first of all enter two digits with the keyboard. These digits are the address word of the control unit. This address word is used to select the individual control units in the vehicle.
If you press the HELP key, the list of address words appears in the display:
List of address words
Address word Designation of system
01 Engine electronics
41 Diesel pump electronic
02 Gearbox electronics
12 Clutch electronics
03 Brake electronics
14 Wheel damping electronics
24 Drive slip control
15 Airbag
26 Electric roof control
17 Dash panel insert
08 AC/Heating electronics
00 Automatic test sequence
(interrogate and display fault
memory for all systems)
After entering the address word (for example “01”) and pressing the key O, the address word and the designation of the system are displayed in the second line of the display.
Vehicle System Test O
01 – Engine electronics
You can still alter the entry with the key C.
6.3. The operating modes which you can select
你可以选择的公作方式
Important preliminary remarks:
重要的初步评述
- The texts which you see in these operating instructions in the display, are only examples. The texts which actually appear depend on the control unit which is connected and on the program card version used.
- If you operate with different systems, you must also use the relevant workshop manuals.
Once you have connected the tester, you can select three different operating modes:
1. Operating mode 1 (“Vehicle System Test”)
2. Operating mode 3 (“self-test”) and
3. Operating mode 4 (“dealership number”)
After the tester has been connected, it automatically moves into operating mode 1 (“Vehicle System Test”). In other words:
Vehicle System Test HELP
Enter address word XX
You can select operating modes 3 and 4 by pressing the key C. The following text then appears in the display:
1 – Vehicle System Test HELP
3 – Self-test 4 – Dealership number
If you press the HELP key, operating information appears on the display.
So much for the preliminary remarks.
If you now press the → key, you can select the individual functions:
Vehicle System Test HELP
Select function XX
If you press the HELP key, the tester displays a list of the functions which you can select:
List of functions
01 – Interrogate control unit version
02 – Interrogate fault memory
03 – Final control diagnosis
04 – Basic setting
05 – Erase fault memory
06 – End output
07 – Code control unit
08 – Read measuring value block
09 – Read individual measuring value
10 – Adaptation
If you wish to select one of these functions, please enter one of the two-digit numbers and confirm this entry with the key O. The tester then sends a command to the control unit. If no provision is made for the selected function in the control unit or if the command cannot be performed because of the present operating state, the following text will appear in the display:
Function is unknown or cannot be →
carried out at the moment.
The address word 00 represents a special case. You can use this address word to start an automatic sequence:
Vehicle System Test O
00 – Automatic test sequence
If you press the key O, the tester sends all the known address words one after the other. If a control unit answers with its control unit identification, this appears in the display.
The tester now reads the fault memory. The fault recognized appear automatically in the display one after the other.
After the contents of fault memory have been output, the dialogue with the control unit is ended and the next address word is sent.
Note: If no dialogue takes place with a control unit (because of an open circuit in the wiring to this control unit or control unit is faulty),
this control unit does not appear in the display.
Once the tester has sent the last address word or the conents of last fault memory have been read, it switches to the initial operating level (in other words the operating level which it had after it was switched on).
How is the datalink to a control unit established?
Enter the address word (e.g. “01”). The following text appears in the display:
Vehicle System Test O
01 – Engine electronics
If you now press the key O, the tester establishes the datalink to control unit. The following text appears in the display:
Vehicle System Test O
Tester sends address word 01
The control unit now answers with its control unit identification:
0123456789 ENGINE →
Coding 00012 WSC 01234
6.3.1.1. Description of the functions
6.3.1.1.1. Function 01 – Interrogating control unit version
If you select this function, the control unit identification appears in the display:
0123456789 ENGINE XXX →
Coding XXXXX WSC XXXXX
The top display line contains the following data:
- On the left: First, the part number of the control unit. This is followed by the designation of the relevant component (ENGINE).
- On the right: The identification of the software presently used in the control unit (provided this identification exists in the control unit).
The bottom display line shows the current coding of the control unit. In the case of memory-coded control units (see Function 07), the display shows the coding and the workshop code (WSC). The workshop code is the came as the dealership number. It indicates the workshop in which the control unit was last coded.
6.3.1.1.2. Function 02 – Interrogating fault memory
Preliminary remark: The tests of the fault sources (or in other words fault locations) in the top display line and the fault types in the bottom display line can each only be indicated with a total of 40 characters. As 40 characters are not always sufficient, the words have to be abbreviated. If you wish to see the complete text, please refer to the workshop manuals.
If you select the Function 02 “Interrogate fault memory”, the display first of all shows the number of fault recognized, for example:
3 faults recognized →
You can now press the → key to display the individual fault numbers with the relevant texts, for example:
→
Fault number: 00513
The fault number appears in the first display and the relevant text appears after pressing the → key.
Engine speed sender – G28
No signal /SP
The designation of the fault source appears in the top line. “G 28” is the component designation which you can find in the workshop literature. The fault type, in other words in this example “No signal”, appears in the bottom line.
If the fault type in the bottom line is displayed with the suffix /SP, this indicates that this is a fault which occurs sporadically (a short-time fault).
6.3.1.1.3. Function 03 – Final control diagnosis
Final control diagnosis is part of the electrical test and enables you to test the circuits of the individual final control elements.
If you select the Function 03 “Final control diagnosis”, the tester requests the control unit to activate the first final control element.
The following text appears in the display:
Final control diagnosis →
Injector cylinder 1 – N 30
You can see the designation of the particular control element in the bottom line.
If you now press the → key, you enter the command for actuating the next control element. The sequence of the control elements is always determined by the control unit.
If a control element which appears in the display is not activated, then please check whether a fault exists in the plug connection, in the wiring harness, in the electrical or mechanical part.
6.3.1.1.4. Function 04 – Basic setting
After performing repairs or inspecting certain systems, it is then necessary to conduct a basic setting (refer also to the workshop manual). In other words, the controls of the control unit are set to fixed values. It is possible, for example, to set the ignition timing if the system is in the basic setting.
The basic setting must only be performed in the operating state recommended for the vehicle. For example, engine oil temperature must be above 80℃. For this reason, a number of control units supply the readouts which are applicable at that moment as a setting aid. After selecting the Function 04, therefore, you must first of all enter a display group number and confirm the entry with key O (see also Function 08):
Basic setting HELP
Enter display group number XX
If the readout is displayed with physical units (in other words “with digits and letters”), you can find the selected display group number in the top display line:
Basic setting 3 →
850 rpm 17﹪ 21﹤° 12.7°BTDC
If you wish to display a different group of measuring values, please press the key C and then enter the desired display group number. You have the additional facility of running through the measuring value groups with the keys (display group number minus 1) and (display group number plus 1).
If you wish to output the measuring values as a block of ten, please use the display group number 00. The following readout then appears in the display:
Basic setting 0 →
176 34 70 128 128 128 128 128 64 39
Note: The meaning of the digits which appear in the display is given in the relevant workshop manual.
If you wish to assess the readouts under normal operating conditions, leave Function 04 (Basic setting) and move into Function 08 (Reading measuring value block). To do this, press key 8. The following readout then appears in the display:
Read measuring value block 3 →
850 rpm 17﹪ 21﹤° 12.7°BTDC
You can now return to Function 04 (Basic setting) by pressing key 4.
6.3.1.1.5. Function 05 – Erasing fault memory
Once you have completed the repair work, you have to erase the fault memory. You do this with Function 05.
Before giving the tester command, first of all check whether the fault memory has been interrogated. If it has been interrogated, the following text appears in the display:
Vehicle System Test →
Fault memory is erased
If the following text appears although the fault memory was erased, you have to once again interrogate the fault memory and rectify the fault.
Vehicle System Test →
Fault memory is not erased
6.3.1.1.6. Function 06 – Ending output
The dialogue with the control unit is ended with Function 06. The tester returns to the initial operating level. You can now enter a new address word. The following test appears in the display:
Vehicle System Test HELP
Enter address word XX
6.3.1.1.7. Function 07 – Coding control unit
Note: Please refer to the workshop manual when using this function!
This function enables you to alter the contents of a memory cell in the control unit. In other words, you can adapt the operation of the control unit to different conditions, for example
- to different engine, gearbox, body or running gear versions
- to different fuel qualities
- to legal provisions in import countries.
If you select the Function 07 “Code control unit”, the following text appears in the display:
Code control unit
Enter code number XXXXX (0 - 00127)
The code number may be within the range between 00000 and 00127 or between 00000 and 32000, respectively. The range applicable to the control unit which is connected is shown in parentheses, in other words 00000-00127 appears in the display above. Form what has been said so far, you will realize that you have to enter a 5-digit number.
You confirm your entry with the key O.
After coding, the control unit answers with the current control unit identification and the relevant workshop code (WSC):
0123456789 ENGINE →
Coding 00111 WSC 01234
6.3.1.1.8. Function 08 – Reading measuring value block
If you select Function 08, the control unit transmits the measuring values to the display. The measuring values appear in the bottom line. They supply information regarding the operating state of the system or of the system sensors.
The measuring values assist you in many cases in fault finding and in rectifying faults.
As not all the measuring values can be assessed at the same time, they are combined into display groups which can be selected by means of display group numbers and viewed one after the other. You will find the display group numbers of the individual control units in the workshop manuals.
If you select 08, the following text appears in the display:
Read measuring value block HELP
Enter display group number XX
As soon as you have entered the display group number and confirmed the entry with key O, the measuring values appear in the bottom line of the display:
Read measuring value block 3 →
850 rpm 17﹪ 21﹤° 12.7°BTDC
In the case of an engine control unit, for example, the individual measuring values are assigned as follows (from left to right in the display):
1 – Engine speed (850 rpm in the display above)
2 – Engine load (17﹪)
3 – Throttle valve angle (21﹤°)
4 – Ignition angle (12.7°BTDC)
The display group number selected appears in the top line of the display (the number 3 in the example above).
You can display a different measuring value group by pressing the key C and entering the desired display group number. In addition, you have the facility of running through the measured value groups with the keys ↑ (display group number minus 1) and ↓ (display group number plus 1).
If you wish to display the measuring values without a physical unit, please enter the display group number 00. You will then see the following readout in the display:
Read measuring value block 0 →
176 34 70 128 128 128 128 128 28 64 39
In the case of an engine control unit, for example, the individual measuring values in the display are assigned as follows (from left to right in the display):
1 – Coolant temperature
2 – Engine load
3 – Engine speed
4 – Position of lambda control
5 – Learned value of lambda control when idling
6 – Learned value of lambda control at high speeds and low load
7 – Learned value of lambda control in top part load range
8 – Pilot control of idling speed stabilization
9 – Switch inputs
10 – Ignition timing
In other words, the first number in the display (in our case the number 176) is the coolant temperature (1); the second number in the display (in our case 34) is the engine load (2) and so on.
Note: Please refer to the relevant workshop manual for an explanation of the numbers which appear in the display.
In order to assess the readouts which appear in the basic setting, you can switch over from Function 08 into Function 04 “Basic setting” by pressing the key 4.
Basic setting 3 →
850 rpm 17﹪ 21﹤° 12.7°BTDC
You can return to Function 08 “Read measuring value block” by pressing the key 8.
6.3.1.1.9. Function 09 – Reading individual measuring value
This function enables you to display an individual measuring value.
Read individual measuring value
Enter channel number XX
You can find the channels which are supported by the control unit in the workshop manual.
To display an individual measuring value, enter a channel number with 2 digits and confirm the entry with key O.
Read individual measuring value →
Channel 10 Measuring value 1534
You can select another channel by pressing the key C.
6.3.1.1.10. Function 10 – Adaptation
Note: Please read up on the subject “Adaptation” in the workshop manual!
You have the possibility of altering correction values (e.g. in respect of idling speed or quantity of fuel injected) in the control unit for each individual vehicle. You have to do this in three steps: a) Reading adaptation, b) Testing adaptation, c) Storing adaptation.
You have a further possibility in this function: d) Erasing learned valued.
a) Reading adaptation
Adaptation
Enter channel number XX
In order to read the existing adaptation value, please first of all enter the two-digit channel number and confirm the entry with the key O. The control unit thereupon transfers the value in use at that moment which the tester displays with the relevant channel number.
Channel 10 Adaptation 12345 →
- ↑ - ↓ -
b) Testing adaptation
You can alter the adaptation value in single steps with the keys ↓ (adaptation value minus 1) and ↑ (adaptation value plus 1) and check the reaction of the control unit or the system, respectively.
If you press the → key, you can enter a new adaptation value and confirm the entry with the key O.
Channel 10 Adaptation 12345
Enter adaptation value XXXXX
In many applications it will prove helpful to observe not only the adaptation value but also the related measuring values.
If a measuring value block is assigned to the channel, this appears in the bottom line of the display.
The form of the measuring value display depends on the type of control unit. The following types of information may appear in the display:
Channel 10 Adaptation 12001 O
176 34 70 128 128 128 128 28 64 39
Channel 10 Adaptation 12001
850 rpm 17﹪ 21﹤° 12.7°BTDC
c) Storing adaptation
Once you have found the right adaptation value, confirm this with the key O.
Channel 10 Adaptation 12001 O
Store changed value?
If you once again press the key O, the adaptation value is transferred to the control unit for storing.
Channel 10 Adaptation 12001 →
Changed value is stored
d) Erasing learned values
In an electronic system, in other words an adaptive system, various settings (e.g. the idling speed setting) adapt to the operating conditions of the engine within a certain range without necessitating setting operations. When performing repairs or after conversion work, it may be necessary to erase these learned values and to set them to a basic setting. This can be done by entering the channel number 00.
Adaptation O
Enter channel number 00
Now, confirm the channel number with the key O. In order to erase the learned values, you need only once again press the key O.
Adaptation O
Erase learned valued?
Adaptation →
Learned values have been erased
6.3.2. Operating mode 3 “Self-test”
You can use the self-test in order to check the electrical operations of the tester. It is possible to check the diagnostic cable (V.A.G 1551/1).
You can start the self-test by pressing key 3. The following steps are then performed:
1. the installed program version is displayed;
2. the program memory is tested. Faults are displayed.
You can perform the following tests with the diagnostic cable V.A.G 1551/1:
- Test of the input and output stages for the K and L wires. Only the cable with the black connector for the power supply should be plugged in! (A fault is indicated you in the display).
- Test of all input stages. The readout in the display indicates whether battery voltage (readout: H) or whether earth (readout: L) is present. You have the facility of testing the diagnostic cable and the input stages.
Status of input stages →
K wire: H L wire: H
If the status H is displayed, the diagnostic cables or the input stages are connected to the H potential (battery voltage). Because of the internal circuitry, H potential is also displayed if the diagnostic cable is not plugged in.
If you wish to test the input stages with the diagnostic cable connected, please connect the appropriate contacts to earth. The readout must change from H to L (L in display equals earth at connector).
You can end the self-test by pressing the → key.
6.3.3. Operating mode 4 “Dealership number”
In this operating mode, you can display the dealership number or enter it yourself.
In order to code a control unit or to perform adaptation, you have to enter the dealership number in the tester. It can no longer be altered after performing one of these functions.
Dealership number HELP
1 – Display 2 – Enter
1 – Displaying dealership number
If you press the key 1, the display shows the dealership number which is stored.
Dealership number →
Stored dealership number: 01234
If you wish to return to the original display, please press the → key!
2 – Entering dealership number
If you wish to enter the dealership number, please press the key 2!
Dealership number
Enter dealership number XXXXX
As the 5 Xs in the display indicate, the dealership number is entered with 5 digits using the keyboard. You can erase an incorrect entry with the key C.
Once you have entered the correct dealership number, store it by pressing the key O.
Dealership number O
Dealership number entered 01234
The following specification applies to entering the dealership number:
User Dealership number
Control unit manufacturer 00000
User from outside the
Organization
000XX 2-digit
Sales Centres,
Imporers
00XXX 3-digit
Volkswagen Group
(Cost Centre)
0XXXX 4-digit
Dealerships XXXXX 5-digit
Once you have entered the dealership number and have stored it by pressing the key O, the original display reappears. You can exit from this display by pressing the key C.
7. Warranty/Service
The warranty period is 12 months starting from the data of the delivery note.
Domestic warranty procedure
In the event of a fault, please contact the following service centre:
EAST
Elektrische Antriebs- und
Steuerungstechnik GmbH
Westendorf 5
38388 Twieflingen
Telephone 05352/3907 or 3908
Fax 05352/58228
Within the warranty period you shall receive a replacement tester or replacement part, also before shipping your tester, free of charge and carriage paid.
The replacement unit is shipped by express carriage (24-hour service within Germany) accompanied by a return order for the faulty unit or part. In the event that the faulty unit or part is not shipped back, we shall invoice you for a new tester.
The warranty terms do not cover natural wear and tear and damage arising from improper use. Following the lapse of the warranty period, the tester can be exchanged subject to the applicable exchange prices.
A new warranty valid for 6 months applies to testers which are exchanged at customer’s expense.
Export warranty procedure
The warranty period is 12 months starting from the data of the delivery note.
In the event of a fault, please contact your importer.
Within the warranty period you shall receive a replacement tester or replacement part free of charge and carriage paid. The faulty unit should be returned to the service centre within 14 days. If the tester is not returned, you shall be invoiced with the price of a new tester.
The warranty terms do not cover natural wear and damage arising from improper use. Following the lapse of the warranty period, the tester can be exchanged subject to the applicable exchange prices.
A new warranty valid for 6 months applies to tester which are exchanged at customer’s expense.
Note: Always use genuine replacement parts for repairs and service!
8. Technical data
Operating voltage : 9 V … 16 V
Power consumption : approx. 400 mA
Temperature in use : - 10℃ ... + 45℃
Storage temperature : - 20℃ ... + 60℃
Housing : - impact-resistant plastic housing
- contact keyboard
- replaceable program card
Display : - illuminated LCD module with 2 lines each of 40 characters
- character height approx. 5mm
- 5 x 7 matrix
Dimensions : L x W x H (in mm) 190 x 140 x 55
Weight : approx. 0.85 kg
9. Replacement parts
Designation Order number
Diagnostic cable V.A.G 1551/1 Z 401 284 WE
V.A.G 1551/3 Z 401 448 WE
This instrument is radio interference suppressed in accordance with AmtsblVfg 243/1991.
The Federal office for Telecommunication Equipment has been advised that the tester has been commercialized. This authority is also entitled to examine series production to ensure that the relevant provisions are respected.
Errors and omissions accepted! Subject to modification.
10. Index of subjects and what they mean
Adaptation values – Settings stored in the control unit (e.g. adaptation of idling speed), which may differ from one vehicle to the next and which can be adapted to the vehicle within a specified range (see Workshop Manual)
Automatic test sequence – The contents of the fault memories of all control units fitted to the vehicle are interrogated and displayed automatically one after the other by entering the address word 00.
Basic setting – To permit adjustment operations to be performed,
all the controls in the control unit are switched off and set to a basic value.
Block of ten – Group of 10 measuring values channel in the control unit. The measuring value of this channel appears in the display after the channel number is entered.
Coding – Adjusting the operation of the control unit to different vehicle configurations (e.g. different engine, gearbox, body or running gear versions).
Control unit – Electronic device for controlling and monitoring vehicle functions.
Control unit function – Activity/task performed by the control unit.
Control unit identification – It is displayed by the tester after selecting the control unit and contains the part number, the clear text, the software version, the coding and, if entered, also the workshop code for the control unit addressed.
Control unit version – Current configuration status of the control unit.
Dealership number – Operating mode of tester for entering the 5-digit dealership number. It is not possible to code the control unit or to change an adaptation value unit the dealership number has been entered.
Diagnostic cable – Cable which connects vehicle and tester
Diagnostic connection – Connection socket for the diagnostic cable on the tester or on the vehicle.
Diagnostic interface – Connection point of tester and of control unit for interchanging data.
Display – Indicating and output unit of the tester.
Display group number – Number of a group of measuring values specified in the control unit.
Fault memory – The fault memory is the element of the control unit which stores all the faults recognised by the control unit.
HELP – Key for displaying operating information.
Initial operating level – Operating level which the tester adopts after the power is switched on.
Interface connector system – Located in the tester trolley V.A.G 1700. The testers are linked up through the interface connector for interchanging data.
K wire – This wire performs two tasks:
– the particular control unit is interrogated (addressed) via the K wire,
– this is then followed by the data interchange between tester and control unit via the K wire.
In other words, the data are transmitted in both directions via the K wire (from the tester and in the reverse direction). Only the K wire is fitted to more recent vehicle systems.
L wire – Designation of the wire which is used to interrogate (address) the control unit. This wire is no longer needed in more recent vehicle systems as the system is addressed via the L wire.
Measuring value – Result of a measurement.
Measuring value block – Specified group of measuring valued from the control unit which can be selected and displayed by entering a display group number.
Memory cell – An element contained in an electronic circuit for storing data.
Memory-coded control unit – Universal control unit which can be adapted to different vehicle versions by entering a code.
NTC resistor – Temperature-dependent measuring element. The resistance decreases as the temperature increases, in other words the voltage at the NTC resistor becomes less. A temperature lever can be assigned to each voltage level.
Operating level – Tester status in which it awaits a keyboard entry.
Operating mode – The tester distinguishes three operating modes:
vehicle system test, self-test, dealership number.
Physical unit – The unit (e.g. ℃) of a physical quantity (e.g. temperature).
Program card – This card contains the software, in other words the programs which the control unit needs to operate.
Program card version – Designation of the program status (data and version number, e.g. 1.07.93 –D/1.0-).
Reverse polarity g – Incorrect connection of the power supply cables.
Reverse polarity protection – Means of protecting tester against reverse polarity.
RS-422 interface – Standardized connection facility on the tester for connecting it to a personal computer.
Self-diagnosis – The control unit monitors the components connected to it and, in the event that a component fails, ensures that operation of the control unit is maintained with certain restrictions. Fault recognized are stored in the fault memory of the tester.
Self-test – Operating mode of the tester for testing the program card and the diagnostic interface of the tester.
Sensor – Device for detecting measuring values
Sensor signal – The measuring values of a sensor.
Vehicle system test – Operating mode of the tester for the interchange of information with the control unit.
Workshop code (WSC) – The 5-digit dealership number of the dealership in which the control unit was last coded or adapted. |
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深度剖析 2019-2020 概念车设计趋势
智能座舱演进的思考
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