GUARD 6I8157 - Caterpillar

The Electronic Control Module (ECM) has been powered for at least two seconds.The ECM reads signal voltage that is above 4.92 VDC for eight seconds.System Response:The ECM will log the diagnostic code. The diagnostic code may be viewed on a display module or on the Caterpillar Electronic Technician (ET). The ECM flags engine oil temperature as invalid data. The ECM sets the engine oil temperature to the same value as the coolant temperature. If the coolant temperature sensor has failed, one of the following values is used:
If the engine is running, the engine oil temperature is set to 65 °C (149 °F).
If the engine is not running, the engine oil temperature is set to −10 °C (14 °F).Possible Performance Effect:
NoneTroubleshooting:Test Step 1. Perform the following diagnostic procedure: "Engine Temperature Sensor Open or Short Circuit - Test"Results:
OK - STOP