Engine Rpm Sensor (RPMS)

This sensor is used only on diesel engines. Disconnect RPMS electrical connector. Using DVOM, measure resistance across sensor terminals. Resistance should be 2400-2800 ohms. Replace sensor if not as specified. Faults in RPMS or sensor circuit should set a service code. See Quick Test procedure in TESTS W/CODES EEC-IV article in the ENGINE PERFORMANCE Section. If no service code has been set, see CIRCUIT TEST DJ in TESTS W/CODES EEC-IV article for additional sensor testing and specifications.