Diagnostic Procedure
1. Select The SystemSelect the type of engine management system the car is fitted with
MOTRONIC
Go to step 2
TRIONIC
Go to step 9
2. Checking The Control Module's Output
Unplug the connector
- Motronic (505)
Go to step 3
3. Checking The Control Module's Output
Part 1 Of 2:
Part 2 Of 2:
Connect test lamp 86 11 857 between pin 51 of the female connector and a good grounding point.
Turn the ignition switch to the ON position.
Go to step 4
4. Checking The Control Module's Output
Contact TCM.
Activate Torque Limitation
- Value should read On.
The test lamp should light.
Is the function correct?
NO
Go to step 5
YES
Go to step 6
5. Rectifying The Lead
Repair or replace the lead between pin 25 of the TCM and pin 51 of the Motronic control module.
6. Final Check
Clear the diagnostic trouble codes in all systems.
Carry out a drive cycle
- Drive the car at varying engine loads and engine rpm for five minutes.
Evaluate the drive cycle
Check that the diagnostic trouble code has not recurred
Is the function correct?
NO
Go to step 8
YES
Go to step 7
7. Final Check
The steps taken to rectify the fault were correct.
- Diagnosis is complete
8. Final Check
Diagnosis for this fault code is complete.
Refer to Procedures, Before Changing A Control Module.
9. Checking The Control Module's Output
Unplug the connector
- Control module, TRIONIC (430a)
Go to step 10
10. Checking The Control Module's Output
Part 1 Of 2:
Part 2 Of 2:
Connect test lamp 86 11 857 between pin 13 of the female connector and a good grounding point.
Turn the ignition switch to the ON position.
Go to step 11
11. Checking The Control Module's Output
Contact TCM.
Activate Torque Limitation
- Value should read ON
The test lamp should light.
Is the function correct?
NO
Go to step 12
YES
Go to step 13
12. Rectifying The Lead
Repair or replace the lead between pin 25 of the transmission control module and pin 13 of the TRIONIC control module.
When repair is complete:
Go to step 13
13. Final Check
Clear the diagnostic trouble codes in all systems.
Carry out a drive cycle:
Drive the car at varying engine loads and engine rpm for five minutes.
Evaluate the drive cycle:
Check that the diagnostic trouble code has not recurred
Is the function correct?
NO
Go to step 15
YES
Go to step 14
14. Final Check
The steps taken to rectify the fault were correct.
Diagnosis is complete
15. Final Check
Diagnosis for this fault code is complete.
Refer to Procedures, Before Changing A Control Module.