Description:

This diagnostic trouble code, TSC 523929.02, is triggered when, during calibration of the cab suspension, the control unit orders the cab to move but the cab moves in the wrong direction. This indicates that the plugs for the raising and lowering solenoid valves may be mixed up, the cab position sensor (B110) may be installed incorrectly, the raising/lowering solenoid valve circuit may be shorted to a supply lead, or there may be a mechanical defect at the solenoid valve for raising/lowering the cab suspension (e.g., valve stuck in open or closed position).

Reaction:

When this error occurs, the cab suspension calibration process fails, leading to incorrect positioning and potentially unsafe operation of the cab suspension system.

Recommendations:

Check Solenoid Valve Connections:

• Verify Correct Connections:
  • Ensure that the plugs for the raising and lowering solenoid valves are correctly connected.
  • Swap the plugs if they are mixed up.

Inspect Cab Position Sensor:

• Check Installation:
  • Verify that the cab position sensor B110 is installed correctly.
  • Reinstall the sensor if necessary.

Inspect Solenoid Valve Circuit:

• Check for Shorts to Supply Lead:
  • Examine the wiring for any signs of short circuits to a supply lead.
  • Repair any identified issues in the circuit.

Inspect Solenoid Valve for Mechanical Defects:

• Check for Stuck Valve:
  • Ensure that the solenoid valve for raising/lowering the cab suspension is not stuck in an open or closed position.
  • Replace the valve if it is faulty.

Note:

Proper installation and connection of the solenoid valves and sensors are crucial for accurate cab suspension calibration. Regular inspections and maintenance of these components are essential to ensure reliable operation.