Throttle Position Signal

OUTPUT SIGNAL TO 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).

Conditions.
No diagnostic trouble code in the Trionic system.





Diagnostic Procedure.
1. Check the lead

- Check the lead between pin 57 of the Trionic control module and pin 25 of the transmission 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 Trionic control module.
- Remove the transmission control module.
- Ignition switch in ON position.
- Take a frequency reading across pins 25 and 22 of the connector.

The frequency should be 100 Hz.

Frequency OK?

YES: Continue with point 3.
NO: Continue at "Before Replacing a Control Module". Component Tests and General Diagnostics





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 fault diagnosis in the Automatic Transmission.
NO: The remedial measure taken was correct.