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Oil Pressure Gauge Not Operating Properly

  1. Using scan tool, check for PCM DTCs. If any OIL PRESSURE SENSOR VOLTS DTCs are set, go to SELF-DIAGNOSTICS - GRAND CHEROKEE article in ENGINE PERFORMANCE. If no OIL PRESSURE SENSOR VOLTS DTCs are present, turn ignition off. Press and hold TRIP/RESET button on instrument panel and turn ignition switch on. Mechanical Instrument Cluster (MIC) self-test will start. Oil pressure gauge should sweep from zero to full scale (high position), and back to zero. If oil pressure gauge passes self-test, go to next step. If oil pressure gauge fails self-test, replace temperature/oil gauge pack. See appropriate INSTRUMENT PANELS article. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  2. Turn ignition off. Remove oil pressure sensor. Oil pressure sensor is located on right rear of engine block (4.0L) or beside oil filter (4.7L) engine. Install oil pressure gauge. Start and idle engine. Read oil pressure. If oil pressure is greater than 4 psi at idle, go to next step. If oil pressure is 4 psi or less at idle, possible mechanical problem may be contributing to low oil pressure. Repair as necessary. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  3. With mechanical oil pressure gauge attached, start engine and allow to idle until engine reaches normal operating temperature. Monitor mechanical oil pressure gauge. If oil pressure is greater than 4 psi at idle, test is complete. If oil pressure is 4 psi or less at idle, possible mechanical problem may be contributing to low oil pressure. Repair as necessary. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
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