When Put In Gear, Drive Signal

DRIVE SIGNAL
INPUT SIGNAL FROM THE AUTOMATIC TRANSMISSION





Symptom Of Fault.
Engine idling speed drops when the selector lever is moved away from P or N.

Conditions.
No diagnostic trouble codes.





Diagnostic Procedure.
1. Check the DRIVE function

- Connect an ISAT scan tool.
- Ignition switch in ON position.
- Select "READ ON/OFF". Select "DRIVE".
- Move the selector lever from P and N to another gear position to check for the presence of an input signal.

Is the ISAT scan tool reading correct?

YES: Change the idle air control valve and then continue with point 3.
NO: Continue with point 2.





2. Check the DRIVE signal

- Remove the Trionic control module.
- Ignition switch in ON position.
- Connect the test lamp to pins 14 and 25 of the Trionic control module's connector.

The test lamp should light up when the selector lever is in any position except P and N.

Functionality OK?

YES: Continue with point 3.
NO: Check and if necessary repair or replace the lead between pin 14 of the Trionic control module and pin 11 of the transmission control module. If the lead is OK, continue fault diagnosis in the Automatic Transmission. Then continue with point 3.





3. Final check:

- Perform a driving cycle:

^ Drive the car at varying loads and engine rpm for 5 minutes.
^ Car speed should exceed 20 km/h at some time during the driving cycle.
^ Stop the car, apply the handbrake and run the engine at idling speed.
^ Switch off the A/C and all electrical equipment. If the car has automatic transmission, select position P.
Allow the engine to stabilize its idling speed for 10 sec.
^ Switch on the A/C and all electrical equipment. If the car has automatic transmission, select position D. Allow the engine to stabilize its idling speed for 10 sec.

- Evaluation of driving cycle:
Check whether diagnostic trouble codes P0505-PO507 have been generated.

Has either of the diagnostic trouble codes been generated?

YES: Continue at Diagnostic Trouble Code P0505, P0506, P0507: Idle Air Control Valve.
NO: The remedial measure taken was correct.