LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2001 >> Cherokee Classic, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0523: Oil Pressure Sensor Volts High >> Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0523: Oil Pressure Sensor Volts High: Testing

  1. Turn ignition on. Using scan tool, read oil pressure sensor voltage. If voltage is 4.8 volts or less, go to step  6 . If voltage is more than 4.8 volts, go to next step.
  2. Turn ignition off. Disconnect oil pressure sensor connector. Oil pressure sensor is located on right side of engine near camshaft position sensor and has a Black 3-pin connector. Disconnect PCM connectors. PCM is located in engine compartment on left front fender, near radiator support. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Brown/Yellow wire between oil pressure sensor harness connector and terminal No. 4 at PCM C1 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown/Yellow wire.
  3. Measure resistance of Gray/Yellow wire between oil pressure sensor harness connector and terminal No. 23 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Gray/Yellow wire.
  4. Ensure ignition is off. Reconnect PCM connectors. Turn ignition on. Measure voltage between ground and Gray/Yellow wire at oil pressure sensor harness connector. If voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, repair short to voltage in Gray/Yellow wire between oil pressure sensor and PCM.
  5. Turn ignition off. Connect a jumper wire between Gray/Yellow and Brown/Yellow wires at oil pressure sensor harness connector. Turn ignition on. Using scan tool, read oil pressure sensor voltage. If voltage is one volt or more, replace PCM. If voltage is less than one volt, replace oil pressure sensor.
  6. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Check for any related technical service bulletins that may apply. Start engine. Using scan tool, monitor oil pressure sensor voltage while wiggling oil pressure sensor wiring harness and connector. Oil pressure sensor is located on right side of engine near camshaft position sensor and has a Black 3-pin connector. If oil pressure sensor voltage changes while wiggling wiring harness, repair wiring harness or connector where wiggling caused voltage to change. If voltage does not change, no problem is indicated at this time. Test is complete.
scientia non olet · About LEMON Manuals