C7 and C9 On-Highway Engines Caterpillar

Use this procedure to troubleshoot a low oil pressure condition. Also, this procedure covers the following diagnostic trouble codes:

Table 1

Diagnostic Trouble Codes for Low Oil Pressure
J1939 Code	Description	Information
100-17	Engine Oil Pressure : Low - Least Severe (1)	Refer to Illustration 1. Oil pressure is below line (1) for at least eight seconds. A snapshot is triggered. The code is logged. Engine performance is not affected.
100-1	Engine Oil Pressure : Low - Most Severe (3)	Refer to Illustration 1. Oil pressure is below line (3) for at least four seconds. Engine power is reduced while this condition exists. A snapshot is triggered. The code is logged. Factory passwords are required in order to clear the logged code. If the low oil pressure condition continues for more than 30 seconds and the "Engine Monitoring Mode" parameter is programmed to "Shutdown", the Engine Control Module (ECM) will shut down the engine.

Illustration 1	g01336004
Chart for low oil pressure (1) Trip line for engine oil pressure : low - least severe (1) (3) Trip line for engine oil pressure : low - most severe (3)

Perform the following procedure:

1. Check the oil level. Refer to the Operation and Maintenance Manual for the correct procedure.

2. Test the engine oil pressure. Refer to Systems Operation/Testing and Adjusting, "Engine Oil Pressure - Test" for the correct procedure.

   If the readings are low, refer to "Reasons for Low Engine Oil Pressure" in the Systems Operation/Testing and Adjusting manual. Make the necessary repairs.