P0705

GEAR SELECTOR POSITION SENSOR, INPUTS TO TRANSMISSION CONTROL MODULE INCORRECT OR ABSENT. SHIFT-LOCK RELAY FAULTY





Fault Symptom.
CHECK GEARBOX indicator lamp on. The system's emergency operation program has been activated.

Conditions.
Non-permitted combination of gear selector position sensor contact functions or shift-lock relay faulty.

Diagnostic Help.
^ The status of the gear selector position sensor's contacts can be ascertained using an ISAT scan tool.
Select "READ ON/OFF".
Select "SELECTOR POS. SENSOR"
The ISAT scan tool shows the status of all contacts, ON and OFF.

^ The functionality of the gear selector position sensor can be checked using an ISAT scan tool, The contacts are decoded and the current gear position is presented.
Select "READ FUNCTIONS".
Select "SELECTOR LEVER POS".

Check The Wiring.
Intermittent faults may occur as a result of temporary short circuits and breaks in the wiring. Jiggle the leads at several places and in different directions to reveal any faults in the wiring harness, including connectors. Observe the multimeter, test lamp or ISAT scan tool while carrying out this check.





Procedure.
1. Check the gear selector position sensor's outputs

- Unplug connector H10-1 (10-pin connector located behind the battery).
- Connect an ohmmeter to the relevant pin as indicated in the table (H10-1, male connector) and pin 8. Check the resistance in respect of all selector lever positions (P, R, N, D, 3, 2, 1), see table.

Table:

Are correct resistance readings obtained?

YES: Proceed to point 3.
NO: Continue with point 2.





2. Check the adjustment of the gear selector position sensor.
Check the setting of the gear selector position sensor.

Is the gear selector position sensor correctly adjusted

YES: Check connector H10-1 for pin slide-out and corrosion. Check the leads connected to the transmission for shorting/continuity due to damaged insulation. If no cause of the fault can be found, change the gear selector position sensor Proceed to point 6.
NO: Adjust the gear selector position sensor, and proceed to point 6.

3. Check The Wiring connected to the transmission control module Check The Wiring by observing the ISAT scan tool display for the relevant input from the gear selector position sensor when the contact connections to B+ in connector H10-1 (female) are opened and closed.
- Turn the ignition switch to the ON position.
- Select "READ ON/OFF".
- Select "SELECTOR POS. SENSOR"
- Read "CONTACT A", "CONTACT B", "CONTACT C" and "CONTACT PA" with the selector lever in position P.

The ISAT scan tool should show OFF in the open position and ON when the relevant female contact (socket) is connected to B+.

Are the test readings correct?

YES: Proceed to point 6.
NO: Continue with point 4.





4. Check The Wiring harness Unplug the shift-lock relay (in the main fuse box, dashboard) and check the continuity of the wiring between connector H10-1 and the transmission control module.

Is the wiring harness OK?

YES: Plug in the shift-lock relay and continue with point 5.
NO: Rectify the fault and proceed to point 6.

5. Check The Wiring harness (contd.)

Check the continuity of the wiring harness between connector H10-1 and the transmission control module.

Is the wiring harness OK?

YES: Continue with point 6.
NO: Change the relay and continue with point 6.

6. Final check

Clear the diagnostic trouble code, drive the car on test at varying engine loads and speeds for 5 minutes and check whether the diagnostic trouble code recurs.

Has the diagnostic trouble code recurred ?

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