Description:

This diagnostic trouble code (TCU 000191.04) is generated if the control unit detects that the voltage at the signal input from channel 1 of the transmission output speed sensor (B63, lead 6081) is too low. This typically indicates a short to ground within the sensor circuit.

Reaction:

When this error code is detected, the equipment may not accurately read the transmission output speed, potentially leading to performance issues or protective mode activation.

Recommendations:

1. Inspect Sensor Circuit:

• Check for Short to Ground: Inspect the wiring and connectors for any signs of shorting to ground.
• Ensure Secure Connections: Make sure all connections are secure and free of corrosion.

2. Test the Sensor:

• Measure Voltage: Use a multimeter to measure the voltage at channel 1 of the sensor input.
• Replace if Faulty: Replace the sensor if it is providing low voltage readings.

3. Examine Wiring and Connectors:

• Inspect for Damage: Check the wiring and connectors for any damage, wear, or disconnection.
• Repair or Replace: Repair or replace any damaged components.

4. Verify Control Unit Functionality:

• Test Control Unit: Ensure that the TCU control unit is correctly processing the sensor signals.
• Update Software: Update the control unit software if needed.

Note:

Maintaining the transmission output speed sensor and its associated circuitry is crucial for accurate performance. Regular inspections and prompt repairs can help prevent issues related to low voltage readings.