Automatic Transmission

Solenoid Valve 1, Checking

• The Solenoid Valve 1 (N88) is a component of the Mechatronic unit and cannot be replaced separately.

Requirements

• The battery voltage must be at least 12.5 Volts.

• All electrical consumers must be switched off.

• The parking brake must be engaged.

• The elector lever must be in the "P" position.

• The Ground (GND) connections to transmission must be OK.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] General Diagnosis.

Start diagnosis

- Disconnect the Transmission Control Module (TCM) (J217) electrical harness connector - direction of the arrow -.





- Observe safety precautions.

- Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK:

- Repair the malfunction.

If the electrical harness connector is OK:

- Check the wiring according to the wiring diagram:

If no malfunctions are found in the wiring:

- Replace the Mechatronic unit in the transmission.

• The Solenoid Valve 1 (N88) is a component of the Mechatronic unit and cannot be replaced separately.

Final procedures

1. Check the DTC memory. => [ 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.