Description:

This diagnostic trouble code (TCU 000161.02) is triggered when the TCU control unit detects a sudden and inexplicable drop in the transmission input speed to 0 rpm. This indicates a potential issue with the B61 sensor responsible for measuring the transmission input speed, suggesting that the sensor may be malfunctioning or there may be an issue within the sensor’s circuit.

Reaction:

When this error code is detected, the equipment might experience erratic behavior or reduced performance due to the incorrect transmission speed readings. The system may enter a protective mode to prevent further issues, resulting in limited operational capabilities.

Recommendations:

1. Inspect the B61 Sensor:

• Check Sensor Connection: Ensure that the B61 sensor for transmission input speed is securely connected.
• Inspect for Damage: Examine the sensor for any physical damage or signs of wear.

2. Test Sensor Functionality:

• Verify Operation: Test the sensor to ensure it is providing accurate readings.
• Replace if Faulty: Replace the sensor if it is found to be defective.

3. Check Wiring and Connectors:

• Inspect Wiring: Check the wiring leading to the sensor for any signs of damage, disconnection, or wear.
• Repair as Necessary: Repair or replace any damaged wiring or connectors.

4. Update Control Unit Software:

• Software Update: Ensure that the TCU control unit software is up-to-date, which may include improvements in sensor signal processing.

Note:

Regular maintenance and checks of the transmission input speed sensor and its associated wiring can help prevent this issue. Ensure all components are in good working condition to maintain accurate speed readings.