Description:

This diagnostic trouble code (TCU 000168.02) is generated when the TCU control unit detects a plausibility problem at the internal transmission power supply inputs (VPS). This indicates an open circuit, a short to a positive lead, or a short to ground in leads 6052 and/or 9008.

Reaction:

When this error code is detected, the equipment may experience erratic behavior or reduced performance due to incorrect power supply to the transmission. The system might enter a protective mode to prevent potential damage, leading to limited operational capabilities or shutdown.

Recommendations:

1. Inspect Power Supply Circuit:

• Check for Open Circuit: Ensure that the power supply circuit is not open and that all connections are secure.
• Inspect for Shorts: Examine the wiring for any signs of shorting to a positive lead or ground.

2. Test Voltage Levels:

• Verify Voltage: Use a multimeter to measure the voltage levels at the VPS inputs.
• Repair if Necessary: Repair or replace any components providing incorrect voltage.

3. Examine Wiring and Connectors:

• Inspect Wiring: Check all wiring and connectors associated with the VPS for damage or disconnection.
• Repair or Replace: Repair or replace any damaged wiring or connectors.

4. Check TCU Functionality:

• Test Control Unit: Ensure that the TCU control unit is functioning correctly and processing power supply signals properly.
• Update Software: Update the TCU software if necessary.

Note:

Regular maintenance and inspection of the power supply circuit and related components are crucial to prevent issues with the internal transmission power supply. Ensure all components are in good working condition to maintain proper power supply.