With Integrated Fault-Diagnosis System (Flash Codes)

Fault diagnosis - stored faults




1 Ground pin of the the ISAT 10 pin socket is under the rear seat on the RH side, or under bellows ahead of shifter on convertible. Use test cable, part No.83 94 504.

2 Read off the fault codes flashed by the "CHECK ENGINE" lamp.

Note: Read through the entire starting procedure carefully before switching on the ignition.




3 Switch on the ignition.
The "CHECK ENGINE" lamp will light up.

4 Set the switch to "ON" (grounding pin 16 of the control module).
The "CHECK ENGINE" lamp will go out.




5 Watch the "CHECK ENGINE" lamp carefully. After about 2.5 seconds it will flash briefly, signifying that the first fault code is to be activated. As soon as the lamp has flashed, set the switch immediately to "OFF".

6 The first of three possible fault codes has now been activated and will be displayed by a series of short flashes of the "CHECK ENGINE" lamp.

Note: The fault codes starts and finishes with a long flash of the "CHECK ENGINE" lamp. These long flashes have nothing to do with the code itself but serve merely to indicate the beginning and end of the code.





Fault code

The entire sequence takes place as shown in the diagram.

In the example, the fault code is "1 2 11 2". Reference to the table shows that the fuel-air mixture on idling is incorrect. When the switch is set to "OFF", fault code "1 2 11 2" will be flashed repeatedly and the next fault code, if any, in the control module memory will not be activated.

Note: If testing is carried out with the engine switched off, the first code flashed will be "1 2 2 3 1" (no speed signal). Engage the starter motor for about 5 seconds.|m-If the fault code disappears, the ignition signal is OK and the fault is elsewhere in the system. As soon as acknowledgement has been received, allow the ignition switch to return to the Drive position and testing will continue.


Next fault code

To check whether there are any additional faults in the system, continue as described below.

7 Set the switch to "ON".

8 After a short flash of the "CHECK ENGINE" lamp, set the switch to "OFF".




Fault code No.2 will then be flashed in same way as the first one.

If an additional fault is stored it will be flashed in the same way as the first fault but with its own fault code.




9 Follow the same procedure to obtain the fault code for a third stored fault, if any. If no third fault has been stored, or all the faults have been rectified, this will be indicated by a continuous series of long flashes.


To restart the test procedure

If for any reason you want to obtain the fault codes again, starting from the first fault, proceed as follows:

1 Set the switch to "ON".




2 After two short flashes, set the switch to "OFF" and the code for fault No.1 will be flashed once again.

Set the switch to "OFF" immediately after the second flash of the "CHECK ENGINE" lamp.


To clear the memory

1 Set the switch to "ON".




2 After three short flashes, set the switch to "OFF".

The memory has now been cleared, which is indicated by a continuous series of long flashes of the "CHECK ENGINE" lamp.




Note: The contents of the memory cannot be cleared before code "00000" has been displayed (indicating end of fault codes).