PIPE AS 3854320 - Caterpillar

The Electronic Control Module (ECM) detects a signal voltage that is above normal.System Response:The code is logged if the engine has been running for more than seven minutes. The check engine lamp will illuminate while this diagnostic code is active. The ECM uses the last valid engine coolant temperature. If the diagnostic code is active at start-up the ECM will use intake manifold temperature. If intake manifold air temperature is not valid, the ECM will default to 90 °C (194 °F) for engine coolant temperature. The engine will not go into cold mode while the diagnostic code is active. The ECM will activate the cooling fan after this code has been active for more than eight seconds.Possible Performance Effect:
There are no performance effects.Troubleshooting:Test Step 1. Perform the following diagnostic procedure: "Engine Temperature Sensor Open or Short Circuit - Test"Results:
OK - STOP