Poor Shifting Performance

Fault Symptom
Poor shifting performance.

Conditions
Short-circuit to ground or open circuit in the signal lead between the gear selector position sensor and the TCS.

Diagnostic Help
The operational status of the TCS, wheelspin or not, can be ascertained using an ISAT scan tool. Select "AUT TRANSMISSION". Select "READ ON/OFF". Select "TCS ACTIVE". Identified wheelspin will result in an ON reading, otherwise the reading will be OFF.





Procedure
1. Check the output signal from the TCS

- Plug a BOB into the transmission control module connector but do not connect the control module,
- Connect the ISAT scan too[.
- Turn the ignition switch to the ON position.
- Select "TCS".
- Select "ACTIVATE".
- Select "TCS LAMP".
The TCS indicator lamp can be turned on and off by means of the ISAT scan tool's F1 and F2 keys.
- Connect a test lamp to pins 4 and 17.
The test lamp should light up at the same time as the TCS indicator lamp.

Does the test lamp work OK?

YES: Inspect the connector visually for moisture, corrosion and pin slide-out. If no relevant cause of the fault can be seen, proceed to point 3.
NO: Continue with point 2.





2. Check the lead between the transmission control module and the TCS control module.
Check the continuity of the wiring between pin 4 of the transmission control module and pin 12 of the TCS control module.

Is the wiring OK?

YES: Continue fault diagnosis in the Traction Control System. The continue with point 3.
NO: Rectify the fault and continue with point 3.





3. Final check

WARNING: In order to activate the TCS function the car can be driven onto a lift. Exercise the greatest caution if this method is used. If only the front suspension assembly is raised and supported on stands, the handbrake must always be applied. In such case, make sure that nobody is standing in front of the car or beside the front wheels when this check is carried out. Speed must be kept as low as possible, but at least above 4 km/h.

- Raise the car's front suspension assembly.
- Connect the ISAT scan tool.
- Start the engine and run it at idling speed.
- Select "AUT TRANSMISSION".
- Select "READ ON/OFF".
- Select "TCS ACTIVE".
- Rev up the engine in gear position 1 and check that the TCS indicator lamp lights up at the same time as "TCS ACTIVE" on the ISAT scan tool changes status from "OFF" to "ON".

Is the result OK?

YES: The remedial action taken was correct.
NO: Continue as described under "Before Changing An Electronic Control Module". Before Changing A Control Module