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Pinpoint Test C: The Low Oil Pressure Warning Indicator Is Never/Always On

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 CHECK LOW OIL PRESSURE INDICATOR OPERATION 
    • Key in ON position.
    • Monitor the low oil pressure warning indicator.
    • Start the engine and monitor the low oil pressure warning indicator.
    • Does the low oil pressure warning indicator operate correctly? 
    1. Yes  : The system is OK.
    2. No  : If the low oil pressure warning indicator is inoperative, GO to C2.

      If the low oil pressure warning indicator is always on, GO to  C3.

  2. C2 CHECK FOR A STUCK CLOSED OIL PRESSURE SWITCH 
    • Key in OFF position.
    • Disconnect: Oil Pressure Switch C103.
    • Key in ON position.
    • Is the low oil pressure warning indicator on? 
    1. Yes  : INSTALL a new oil pressure switch. REFER to FUEL CHARGING & CONTROLS - 2.3L , FUEL CHARGING & CONTROLS - 3.0L (2V) or FUEL CHARGING & CONTROLS - 4.0L SOHC . TEST the system for normal operation.
    2. No  : GO to  C5.
  3. C3 CHECK A FOR STUCK OPEN OIL PRESSURE SWITCH 
    • Key in OFF position.
    • Disconnect: Oil Pressure Switch C103.
    • Key in ON position.
    • Connect a fused jumper wire (10A) between the oil pressure switch C103, circuit 253 (DG/WH), harness side and ground.
      Fig 1: Checking For Stuck Open Oil Pressure Switch
      G03277035Courtesy of FORD MOTOR CO.
    • Is the low oil pressure warning indicator on? 
    1. Yes  : GO to  C7.
    2. No  : REMOVE the jumper wire. GO to C4.
  4. C4 CHECK CIRCUIT 253 (DG/WH) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the instrument cluster C220a pin 7, circuit 253 (DG/WH), harness side and the oil pressure switch C103, circuit 253 (DG/WH), harness side.
      Fig 2: Checking Circuit 253 (DG/WH) For Open
      G03277036Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  C6.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  5. C5 CHECK CIRCUIT 253 (DG/WH) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the instrument cluster C220a pin 7, circuit 253 (DG/WH), harness side and ground.
      Fig 3: Checking Circuit 253 (DG/WH) For Short To Ground
      G03277037Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. Yes  : GO to C6.
    2. No  : REPAIR the circuit. TEST the system for normal operation.
  6. C6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
  7. C7 CARRY OUT THE OIL PRESSURE TEST 
    1. Yes  : INSTALL a new oil pressure switch. REFER to ENGINE 2.3L , ENGINE 3.0L (2V) or ENGINE 4.0L SOHC . TEST the system for normal operation.
    2. No  : REFER to ENGINE SYSTEM-GENERAL INFORMATION to continue diagnosis of the engine oil system.
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