Control Module: Testing and Inspection

Transmission Control Module Voltage Supply, Checking

• The Transmission Control Module (TCM) (J217) is a component of the mechatronic unit in the transmission and cannot be replaced separately.

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagrams.

Requirements

• Fuses (S132, SB31,) and (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.

Test procedure

- Perform a preliminary check to verify the customer's complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis





- Release the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) (J217).

Observe safety precautions.

- 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 T16c terminal 11 to Ground (GND) for voltage.

Specified value: battery voltage.

- Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector T16c terminal 14 to Ground (GND) for voltage.

Specified value: battery voltage.

- Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector T16c terminal 16 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 T16c terminals 11,14 and 16 for an open circuit or a short circuit.

- If necessary, repair the faulty wiring.

If the specified value was obtained:

Checking Ground (GND)

- Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector T16c terminal 13 to Ground (GND) for resistance.

Specified value: 1.5 ohms max.

- Using a Multimeter, check the Transmission Control Module (TCM) (J217) electrical harness connector T16c terminal 16 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.

If no malfunction is found in the wiring:

- Replace the Mechatronic unit in the transmission.

• The Transmission Control Module (TCM) (J217) is a component of the Mechatronic unit and cannot be replaced separately.

- 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