The coolant temperature signal voltage is above the acceptable range.
System Response:
Electronic System Response Coolant temperature is set to 90 °C (194 °F) while the diagnostic code is active. Cold Mode is disabled. If the ECM is controlling the cooling fan, the fan will be ON.
Service Tool Display or Lamps Caterpillar Electronic Technician (ET) will indicate 90 °C (194 °F) and display "DIAG" next to "Engine Coolant Temperature" on the status screen while the diagnostic code is active. The Check Engine Lamp will NOT illuminate unless this diagnostic code has been continuously active for 10 hours.
Engine Response Occasionally, the engine may emit white smoke on start-up because Cold Mode is not active.
Test Step 1. Perform the following diagnostic procedure: Engine Temperature Sensor Open or Short Circuit - Test
Results:
- OK - STOP