JCB P0668: ECU Internal Temperature Sensor Low Fault

The system has detected a low fault condition in the ECU internal temperature sensor. This indicates that the sensor is reporting a temperature that is below the expected range, which may affect the proper operation of the ECU.

1. 1

   The ECU internal temperature sensor

2. 2

   The wiring and connections to the ECU internal temperature sensor

3. 3

   The ECU itself for potential internal faults

1. 1

   Inspect

   Inspect the ECU internal temperature sensor for physical damage or signs of overheating.

2. 2

   Check

   Check the wiring and connections to the ECU internal temperature sensor for corrosion, looseness, or damage.

3. 3

   Test

   Test the ECU internal temperature sensor using a multimeter to verify its output against the expected range.

4. 4

   Replace

   If the ECU internal temperature sensor is faulty, replace it with a compatible replacement.

5. 5

   Verify

   After repairs, verify that the fault code is cleared and that the ECU operates within normal temperature ranges.