Description:

This diagnostic trouble code (TCU 000191.11) is generated if there is a frequency discrepancy between the signal from the transmission output speed sensor (B63) and the amplified signal from the wheel speed sensor (B84). This discrepancy indicates a potential issue with the B63 sensor or its circuitry, causing mismatched speed readings.

Reaction:

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

Recommendations:

1. Inspect Sensor Signals:

• Verify Sensor Outputs: Compare the output signals from the B63 sensor and the B84 sensor to identify discrepancies.
• Check Sensor Alignment: Ensure both sensors are correctly aligned and installed.

2. Test the Sensors:

• Measure Frequencies: Use diagnostic tools to measure the frequencies of both sensors.
• Replace if Faulty: Replace the sensor if it is providing inconsistent readings.

3. Examine Wiring and Connectors:

• Inspect Wiring: Check all wiring and connectors associated with both sensors for damage or disconnection.
• Repair or Replace: Repair or replace any faulty wiring or connectors.

4. Verify Control Unit Functionality:

• Test Control Unit: Ensure that the TCU control unit is correctly processing signals from both sensors.
• Update Software: Update the control unit software if necessary.

Note:

Maintaining the transmission output speed sensor and its associated circuitry is essential for accurate performance. Regular inspections and prompt repairs can help prevent issues related to frequency discrepancies.