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Pinpoint Test An: The Low Engine Oil Pressure Warning Indicator Is Never Or Always On

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  1. Refer to Wiring Diagrams INSTRUMENT CLUSTER for schematic and connector information.

    Normal Operation and Fault Conditions 

    See Low Engine Oil Pressure Warning. REFER to: Instrument Panel Cluster (IPC) - System Operation and Component Description .

    If the engine rpm data or engine oil pressure warning indicator request message is missing less than 5 seconds, the IPC defaults the low engine oil pressure warning indicator or RTT warning indicator to the last state (on or off), based upon the last message received.

    If the engine rpm data or engine oil pressure warning indicator request message is missing for 5 seconds or longer, the IPC defaults the low engine oil pressure warning indicator or RTT warning indicator on.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0520:00 Engine Oil Pressure Sensor/Switch "A" Circuit: No Sub Type Information Sets in the PCM when the PCM detects a fault on the hardwired input from the engine oil pressure sensor.
    PCM P0522:00 Engine Oil Pressure Sensor/Switch "A" Circuit Low: No Sub Type Information Sets in the PCM when the PCM detects a short to ground on the hardwired input from the engine oil pressure sensor.
    PCM P0523:00 Engine Oil Pressure Sensor/Switch "A" Circuit High: No Sub Type Information Sets in the PCM when the PCM detects an open on the hardwired input from the engine oil pressure sensor.
    PCM U0600:00 Lost Communication With Engine Oil Pressure Sensor "A": No Sub Type Information Sets in the PCM when the PCM detects a loss of voltage on the engine oil pressure signal circuit.

    Possible Sources 

    • Wiring, terminals or connectors
    • Instantaneous invalid sensor signal
    • Engine oil pressure sensor
    • GWM
    • PCM
    • IPC

  2. AN1 CHECK THE ENGINE OIL PRESSURE SENSOR STATUS

    NOTE: Make sure the engine temperature is warm or hot when performing this step.

    • Ignition ON.

    • Using a diagnostic scan tool, view the PCM Parameter Identifications (PIDs).

    • Access the PCM and monitor the EOP_URPID

    Is an engine oil pressure sensor circuit fault present? 

    Yes  GO to  AN7
    No  GO to  AN2

  3. AN2 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) SELF-TEST

    • Using a diagnostic scan tool, perform the PCM self-test.

    • Check for recorded Diagnostic Trouble Codes (DTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  For DTC P0520:00, P0522:00, P0523:00 or U0600:00, GO to  AN7 For all other Diagnostic Trouble Codes (DTCs), REFER to the Master DTC Chart.
    No  GO to  AN3

  4. AN3 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors and the hood.

    • Clear all message center warnings by pressing the OK button for each warning present.

    • Monitor the door ajar RTT warning indicator.

    • Open the driver door.

    • Clear the message center popup warning.

    • Monitor the door ajar RTT warning indicator.

    Is the door ajar RTT warning indicator off with the door closed, and on with the door open? 

    Yes  GO to  AN4
    No  GO to Pinpoint Test A 

  5. AN4 CHECK THE TACHOMETER OPERATION

    • Start the engine.

    • Verify the tachometer operates.

    Does the tachometer operate? 

    Yes  GO to  AN5
    No  For 12-inch display IPC, GO to Pinpoint Test B  For the 4-inch or 8-inch display IPC, GO to Pinpoint Test H 

  6. AN5 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

    • Using a diagnostic scan tool, perform the IPC self-test.

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to the IPCDTC Chart.
    No  GO to  AN6

  7. AN6 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)

    • Using a diagnostic scan tool, check the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  AN7

  8. AN7 CHECK FOR VOLTAGE AT THE ENGINE OIL PRESSURE SENSOR

    • Ignition OFF.

    • Disconnect Engine Oil Pressure Sensor C1642 (2.7L Engine).

    • Disconnect Engine Oil Pressure Sensor C1936 (3.0L Diesel).

    • Disconnect Engine Oil Pressure Sensor C1957 (3.3L Engine).

    • Disconnect Engine Oil Pressure Sensor C1657 (3.5L Engine).

    • Disconnect Engine Oil Pressure Sensor C103 (5.0L Engine).

    • Ignition ON.

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 C1642-2

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 C1936-2

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 C1957-2

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 C1657-2

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 C103-2

    Is the voltage approximately 5 volts? 

    Yes  GO to  AN8
    No  GO to  AN11

  9. AN8 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C1232E (2.7L Engine).

    • Disconnect PCM C1233E (3.0L Diesel).

    • Disconnect PCM C1551E (3.3L Engine).

    • Disconnect PCM C175E (3.5L Engine).

    • Disconnect PCM C1381E (5.0L Engine).

    • Ignition ON.

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-1
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-1
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-1
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-1
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-1
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  AN9

  10. AN9 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1232E-29

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1233E-115

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1551E-50

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C175E-29

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1381E-29

    Is the resistance less than 3 ohms? 

    Yes  GO to  AN10
    No  REPAIR the circuit.

  11. AN10 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-1
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  INSTALL a new engine oil pressure sensor. REFER to the appropriate Electronic Engine Controls article. CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the engine oil pressure RTT is still always on, REFER to the appropriate Electronic Engine Controls article.
    No  REPAIR the circuit.

  12. AN11 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C1232E (2.7L Engine).

    • Disconnect PCM C1233E (3.0L Diesel).

    • Disconnect PCM C1551E (3.3L Engine).

    • Disconnect PCM C175E (3.5L Engine).

    • Disconnect PCM C1381E (5.0L Engine).

    • Ignition ON.

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-3
      GFD560558Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  AN12

  13. AN12 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1232E-117

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1233E-11

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1551E-116

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C175E-117

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1381E-117

    Is the resistance less than 3 ohms? 

    Yes  GO to  AN13
    No  REPAIR the circuit.

  14. AN13 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO GROUND

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-3
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AN14
    No  REPAIR the circuit.

  15. AN14 CHECK THE ENGINE OIL PRESSURE SENSOR RETURN CIRCUIT FOR AN OPEN

    • Measure:

      2.7L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1642-2
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1232E-112

      3.0L Diesel 

      Positive Lead Measurement / Action Negative Lead
      C1936-2
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1233E-9

      3.3L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1957-2
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1551E-89

      3.5L Engine 

      Positive Lead Measurement / Action Negative Lead
      C1657-2
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C175E-112

      5.0L Engine 

      Positive Lead Measurement / Action Negative Lead
      C103-2
      GFD560559Courtesy of FORD MOTOR COMPANY
      		 C1381E-112

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new engine oil pressure sensor. REFER to the appropriate Electronic Engine Controls article. CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the low engine oil pressure RTT is still always on, REFER to the appropriate Electronic Engine Controls article.
    No  REPAIR the circuit.
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