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Pinpoint Test J: The Low Oil Pressure Warning Indicator Is Never/Always On (Hybrid)

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. J1 CHECK THE TACHOMETER 
    • Start the engine and observe the tachometer.
    • Is RPM present on the tachometer? 
    1. YES  : Go to  J2.
    2. NO  : Go to Pinpoint Test D .
  2. J2 CHECK THE ENGINE OIL PRESSURE SWITCH OPERATION 
    • Key in OFF position.
    • Disconnect: Engine Oil Pressure Switch C103
      • Fig 1: Connecting Fused Jumper Wire
      G03890240Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) jumper wire between the engine oil pressure switch C103-1, circuit 253 (DG/WH), harness side and ground.
    • Key in ON position.
    • Monitor the low oil pressure warning indicator with the jumper wire connected and disconnected.
    • Does the low oil pressure warning indicator turn on with the jumper wire connected and turn off with the jumper wire disconnected? 
    1. YES  : Go to  J3.
    2. NO  : Go to  J4.
  3. J3 CARRY OUT THE ENGINE OIL PRESSURE TEST 
    1. YES  : INSTALL a new engine oil pressure switch. TEST the system for normal operation.
    2. NO  : REFER to ENGINE SYSTEM - GENERAL INFORMATION article.
  4. J4 CHECK CIRCUIT 253 (DG/WH) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220
      • Fig 2: Checking Circuit For Open Or Short To Ground
      GF0025821Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster C220-19, circuit 253 (DG/WH), harness side and the engine oil pressure switch C103-1, circuit 253 (DG/WH), harness side; and between the instrument cluster C220-19, circuit 253 (DG/WH), harness side and ground.
    • Is the resistance less than 5 ohms between the instrument cluster and the engine oil pressure switch, and greater than 10,000 ohms between the instrument cluster and ground? 
    1. YES  : Go to  J5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. J5 CHECK CIRCUIT 253 (DG/WH) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 3: Checking Circuit For Voltage
      GF0025822Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument cluster C220-19, circuit 253 (DG/WH), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  J6.
  6. J6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect the instrument cluster connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the instrument cluster connector and make sure it seats correctly.
    • Operate the system and determine if 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.
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