Control Module: Testing and Inspection

Transmission Control Module Voltage Supply, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Requirements

• Fuses (SB31 & SA20) OK.

• The battery voltage must be at least 12.5 V.

• The Ground (GND) connections at the transmission OK.

• The parking brake engaged.

• The selector lever of automatic transmission in position "P".

• All electrical consumers switched off.

• The ignition switched off.

Procedure

- Disengage the cover from vehicle floor and heat shield above exhaust system in rear area of transmission, then move the heat shield aside slightly.

- Disconnect the Transmission Control Module (TCM) (J217)harness connector by moving it in the direction of the - arrow -and it from disconnecting it from the transmission.





• Adaptation values in Transmission Control Module (TCM) are reset when the harness connector is disconnected.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- Repair any damage found to the electrical harness connector.

If the electrical harness connector is not OK:

- Repair the malfunction.

If the electrical harness connector is OK:

Checking voltage

- Switch the ignition on.

- Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector terminal T20d/9 and terminal T20d/10 to Ground (GND) for voltage.

Specified value: battery voltage.

- Switch the ignition off.

If the specified value was not obtained:

- Check the wiring from the Transmission Control Module (TCM) (J217) electrical harness connector terminals T20d/9 and T20d/10 for an open circuit or a short circuit.

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking Ground (GND)

- Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector terminal T20d/8 to Ground (GND) for resistance.

Specified value: 1.5 ohms max.

If the specification was not obtained:

- Check the wiring for a an open circuit.

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring:

- Replace the Transmission Control Module (TCM) (J217). Refer to => [ Transmission Control Module, Replacing ] Service and Repair.

- Assembly is performed in the reverse of the removal.

Final procedures

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase DTC memory of the Transmission Control Module (TCM) (J217). => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. Generate readiness code. => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

End diagnosis.