Transmission
Oil Pressure/Temperature Sensor (G437) or Oil Pressure/Temperature Sensor 2 (G640)
Special tools, testers and auxiliary items required
• Socket 27 mm (T40218)
• Vehicle Diagnostic Tester
• Drip Tray
Important Safety Precautions:
• The sensor identity must be adapted in the All Wheel Drive (AWD) control module (J492) see vehicle diagnostic tester after replacing the oil pressure/temperature sensor or oil pressure/temperature sensor 2.
• The oil pressure/temperature sensor and oil pressure/temperature sensor 2 should not be replaced together at the same time because a valid sensor identity is needed for the allocation of the rear final drive AWD control module. The AWD control module would interpret the changing of both sensors at the same time as if the rear final drive was replaced. This will erase all adaptation values stored in the control module and will impair the performance of the rear final drive.
• If both the oil pressure/temperature sensor and oil pressure/temperature sensor 2 must be replaced due to mechanical damage, then this must be performed in two steps. After replacing the first sensor, the AWD control module must be reprogrammed with its identity see vehicle diagnostic tester. Then the same applies to the second sensor.
• If both the oil pressure/temperature sensor and oil pressure/temperature sensor 2 have to be replaced at the same time due to an electrical malfunction, then the AWD control module must be programmed with the new clutch classification see vehicle diagnostic tester. The ATF in the rear final drive must also be replaced. Refer to => [ ATF in Rear Final Drive 0BF and 0BE, Draining ] ATF In Rear Final Drive 0BF and 0BE, Draining.
• Observe general repair notes, refer to => [ Repair Information ] Repair Information.
• Follow all Safety Precautions, refer to => [ Safety Precautions and Test Procedures ] Safety Precautions and Test Procedures.
Removing
• Turn off the ignition.
- Place the vehicle on a hoist.
- Slightly lower the rear section of the exhaust system and secure it.
- Remove the wiring harness bracket from the rear final drive if necessary => [ Remove the bolts and remove the wiring harness bracket from the rear final drive. ] Hydraulic Control Unit.
- Disconnect the connector - 1 - from the oil pressure/temperature sensor 2 or the connector - 2 - from the oil pressure/temperature sensor.
• Disconnect the connectors - 3 and 4 - if necessary.
- Place the drip tray under the rear final drive.
- Remove each sensor using the (T40218).
- A - = Oil pressure/temperature sensor 2 - black connector
- B - = Oil pressure/temperature sensor - brown connector
Installing
- Carefully install the new sensor with a new O-ring - arrow - and then tighten it to the tightening specification - item 9 - => [ (Item 9) ] Overhaul or - item 10 - => [ (Item 10) ] Overhaul.
- A - = Oil pressure/temperature sensor 2 - black connector
- B - = Oil pressure/temperature sensor - brown connector
- Connect the connector - 1 - to the oil pressure/temperature sensor 2 or the connector - 2 - to the oil pressure/temperature sensor.
• Connect the connectors - 3 and 4 - if they were disconnected earlier.
- Attach the wiring harness bracket to the rear final drive, if it was removed earlier => [ Hold the bracket on the rear final drive and tighten the bolts to the tightening specification ] Rear Final Drive.
- Connect the vehicle diagnostic tester and turn on the ignition.
- Select 22 - Adapt Sensor in the vehicle diagnostic tester under Guided Functions in directory 22 - AWD Electronics
• Follow all the instructions in the vehicle diagnostic tester exactly.
Using the vehicle diagnostic tester, "adapt" the new sensor to the AWD control module.
• A system check takes places after 22 - Adapt Sensor finishes. Use "Guided Fault Finding" to correct any malfunctions that may have been detected.
- Fill the ATF in the rear final drive. Refer to => [ ATF in Rear Final Drive 0BF and 0BE, Filling ] ATF In Rear Final Drive 0BF and 0BE, Filling.
- Install the rear section of the exhaust system free of tension.