P0705

DIAGNOSTIC TROUBLE CODE P0705
TRANSMISSION RANGE SWITCH, INPUTS TO TCM FAULTY OR MISSING AND GEAR SHIFT-LOCK RELAY FAULTY

Fault symptom
Warning lamp CHECK GEARBOX is lit.
The system's emergency program has been activated.

Conditions.
Non-permitted combination of gear selector sensor's contact functions or relay for gear shift-lock faulty (certain markets).

Diagnostic procedure
1. Connect ISAT scan tool to the car's data link connector. Check the transmission range switch by initiating, in the ISAT menu READ ON/OFF, RANGE SWITCH A, RANGE SWITCH B, RANGE SWITCH C and RANGE SWITCH D from all positions on the selector lever.

Nominal values as in the following table:





If the measurement results are correct, go to step 6. If any measurement result is wrong, go to step 2.





2. Analyze the measurement results in accordance with the table in step 1. If the measuring results in OFF in all contact functions, check and, if necessary, remedy fuse 17 and the power supply of battery positive voltage to the fuse.

If the measuring gives the correct answers for RANGE SWITCH A and D but the wrong answers for RANGE SWITCH B and C, the gear shift-lock should be searched for faults.

The gear shift-lock relay is fitted in the distribution center inside the car under the facia.

Remove the gear shift-lock relay and repeat the check as specified in step 1. Take special note of the answers for RANGE SWITCH B and C. If the measurement results are correct, install a new gear shift-lock relay.

If the measurement results are wrong, go to step 3.

For all other combinations of measurement results, go to step 3.

3. With the ignition switched OFF, disconnect contact H10-3 in the engine compartment behind the battery (grey 10 pin Packard connector).

Connect a voltmeter between:
^ pin 7 (gear position sensor A) and secure ground,
^ pin 8 (gear position sensor B) and secure ground,
^ pin 9 (gear position sensor C) and secure ground,
^ pin 10 (gear position sensor D) and secure ground,
in the connector on the wiring that leads to the transmission (female).

Nominal voltage values should be in accordance with the following table:





If the measurement results are correct, go to step 4.





If any of the measurement results are wrong, the following applies:
^ If measurement results from only one pin are wrong, check the wiring between connector H10-3 and connector 239 (4 pin) on the transmission. Also check the connectors for slide-outs. Remedy any faulty cables or pins.
^ If a fault occurs in certain selector lever positions, the transmission range switch is faulty. Adjust the transmission range switch as described in checking/adjusting of the range switch. If the fault remains, install a new transmission range switch.

4. With the ignition switched OFF, connect a BOB between Transmission Control Module (TCM) and wiring. Disconnect the connector to the TCM.

Connect a voltmeter between:
^ pin 9 (range switch A) and pin 35 (ground),
^ pin 10 (range switch B) and pin 35 (ground),
^ pin 28 (range switch C) and pin 35 (ground),
^ pin 27 (range switch D) and pin 35 (ground).





With the ignition switched on, the nominal current values are shown in the table in step 3.

If the measurement results are correct, go to step 5.

If all the measurement results are wrong, repeat measurement of the current with pin 22 as reference ground.

If all the measurement results are correct, check and remedy the ground connection from pin 35.

If any of the measurement results are wrong, the following applies:

^ If only the measurement results for pins B and C are wrong, remove the gear shift-lock relay and repeat measurement of the current. If the measurement values are correct, install a new gear shift-lock relay (437). If the fault remains, first carry out continuity measuring (ohm measuring) between pin 10 and gear shift-lock relay pin 4 and pin 28 and gear shift-lock relay pin 8. Nominal resistance value is <1 ohm. If the resistance is >1 ohm, check and, if necessary, remedy the wiring.

Secondly, carry out continuity measuring between pin 10 and connector H10-3 pin 8 (male) and pin 28 and connector H10-3 pin 9 (female).

- Nominal resistance value is <1 ohm.

If the resistance is >1 ohm, check and, if necessary, remedy the wiring.

If the measurement results for pins A and D are wrong as well, carry out continuity measuring (ohm measuring) between:

- pin 9 and connector H10-3 pin 7 (male),
- pin 10 and connector H10-3 pin 8 (male),
- pin 28 and connector H10-3 pin 9 (male),
- pin 27 and connector H10-3 pin 10 (male).

Normal resistance value is <1 ohm. If the resistance is >1 ohm, check and, if necessary, remedy the wiring.





5. Connect a BOB to the TCM. Connect a voltmeter to pins 9, 10, 28 and 27 respectively with pin 35 as grounding step.

Nominal values with the ignition switched on are in accordance with the table in step 3.

If the measurement results are correct, go to step 6.

If any measurement result is wrong, go to "Actions Before Changing a TCM".

6. Clear the fault code, start and test-run the car and check if the code reappears.

If a fault code is recorded, go to "Actions Before Changing a TCM".