Description:

Error code ECU 001639.16 is triggered when the ECU detects that the rotational speed signal from the proportional solenoid valve for the charge air cooler is moderately higher than expected. This may indicate an issue with the solenoid valve’s control or a sensor malfunction affecting its operation.

Reaction:

The function of the proportional solenoid valve may be limited or disabled to prevent potential damage or malfunction due to the incorrect speed signal.

Recommendations:

• Inspect Solenoid Valve and Sensor: Check the proportional solenoid valve and its speed sensor for signs of damage or malfunction.
• Verify Wiring and Connections: Examine the wiring and connectors associated with the solenoid valve and speed sensor for any signs of damage, corrosion, or loose connections.
• Calibrate or Adjust Sensor Output: Use diagnostic tools to calibrate or adjust the sensor output to ensure it matches the expected speed range.
• Replace Faulty Sensor or Solenoid: If calibration does not resolve the issue, replace the faulty sensor or solenoid to ensure proper operation.
• Reset ECU and Verify Operation: After making the necessary repairs or adjustments, reset the ECU to clear the error code and test the system to confirm that the proportional solenoid valve operates correctly and the speed signal is within the normal range.

Note:

Maintaining accurate control over the charge air cooler’s solenoid valve is crucial for engine performance and efficiency. Regular checks and maintenance can help prevent issues related to incorrect solenoid operation.