Description:

This error code indicates that the voltage detected at the coolant temperature sensor is too high. This condition typically results from a circuit that is either open or shorted to 12V, which disrupts accurate temperature readings and affects engine performance.

Reaction:

When this error is detected, the control software will limit or disable certain functions to protect the engine and ensure safe operation. This precautionary measure helps prevent potential damage due to incorrect temperature readings.

Recommendations:

Inspect Sensor Wiring:

• Check the wiring harness connected to the coolant temperature sensor for any signs of damage, disconnection, or corrosion.
• Repair or replace any damaged wiring.

Test Sensor Connector:

• Ensure the sensor connector is properly seated and free from debris or corrosion.
• Clean or replace the connector if necessary.

Measure Sensor Voltage:

• Use a multimeter to measure the voltage at the coolant temperature sensor. Ensure it falls within the manufacturer-specified range.

Check for Shorts:

• Inspect the wiring for any signs of shorts to 12V. This includes checking for any exposed wires that may be touching metal surfaces.

Replace Faulty Sensor:

• If the sensor itself is determined to be faulty, replace it with a new, manufacturer-approved part.

Verify ECU Connections:

• Ensure that all connections to the Engine Control Unit (ECU) are secure and free from corrosion.

Note:

Routine inspection and maintenance of sensor wiring and connections are essential for accurate temperature monitoring. Addressing any signs of wear or damage promptly can prevent recurrent issues with high voltage readings.