Input Signal From the Auto Trans, Torque Limitation

INPUT SIGNAL FROM AUTOMATIC TRANSMISSION





Symptom Of Fault.
The CHECK ENGINE lamp (MIL) is on.
The CHECK GEARBOX lamp is-on. Diagnostic trouble code in transmission control module (TCM).





Diagnostic Procedure.
1. Check the lead
- Check the lead between pin 13 of the transmission control module and pin 13 of the Trionic control module for continuity.
- Check the lead for open circuit and shorting.

Is the lead OK?

YES: Continue with point 2.
NO: Rectify the fault and then continue with point 3.





2. Check the output signal
- Ignition switch in the OFF position.
- Plug in the transmission control module.
- Remove the Trionic control module.
- Ignition switch in ON position.
- Connect the test lamp to pins 13 and 1 of the Trionic control module's connector.
- Connect an ISAT scan tool.
- Select "AUT TRANSMISSION".
- Select "ACTIVATE".
- Select " TORQUE LIMITATION". The test lamp should flash.

Functionality OK?

YES: Continue with point 3.
NO: Continue fault diagnosis in the Automatic Transmission.





3. Final check:

- Clear the diagnostic trouble code.
- Implementation of driving cycle: Drive the car at varying engine loads and rpm for 5 minutes.
- Evaluation of driving cycle: Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?

YES: Continue at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO: The remedial measure taken was correct.