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Pinpoint Test Z: The Low Engine Oil Pressure Warning Indicator Is Never Or Always On (3.5L TIVCT)

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

    Normal Operation and Fault Conditions 

    See Low Engine Oil Pressure Warning. REFER to: Instrument Panel Cluster (IPC) - 3.5L Duratec (202kW/275PS)/3.5L EcoBoost (235kW/320PS) - 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 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 on.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    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.

    Possible Sources 

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

  2. Z1 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 Idenfications (PIDs).

    Access the PCM and monitor the EOP_URPID

    Is an engine oil pressure sensor circuit fault present? 

    Yes  GO to  Z7
    No  GO to  Z2

  3. Z2 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  If DTC P0522 or P0523 is recorded, GO to  Z7For all other Diagnostic Trouble Codes (DTCs), REFER to: Electronic Engine Controls .
    No  GO to  Z3

  4. Z3 PERFORM THE IPC (INSTRUMENT PANEL CLUSTER) INDICATOR LAMP CONTROL ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL

    • Ignition ON.

    • Using a diagnostic scan tool, view the IPC Parameter Identfications (PIDs).

    Access the IPC and control the OIL_P_LOWPID

    • Command the low engine oil pressure warning indicator on then off while observing the indicator.

    Does the low engine oil pressure warning indicator turn on when commanded on and turn off when commanded off? 

    Yes  GO to  Z4
    No  INSTALL a new IPC. Refer to INSTRUMENT PANEL CLUSTER (IPC) .

  5. Z4 CHECK THE TACHOMETER OPERATION

    • Start the engine.

    • Verify the tachometer operates.

    Does the tachometer operate? 

    Yes  GO to  Z5
    No  GO to Pinpoint Test F 

  6. Z5 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 appropriate IPC DTC Chart.
    No  GO to  Z6

  7. Z6 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  Without SYNC 4, REFER to: Communications Network . or with SYNC 4, REFER to: Controller Area Network (CAN) Module Communications Network .
    No  GO to  Z7

  8. Z7 CHECK FOR VOLTAGE AT THE ENGINE OIL PRESSURE SENSOR

    • Ignition OFF.

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

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1657 Pin 3
      GFD787027Courtesy of FORD MOTOR COMPANY
      		 C1657 Pin 2

    Is the voltage approximately 5 volts? 

    Yes  GO to  Z8
    No  GO to  Z11

  9. Z8 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C1551E (3.5L).

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1551E Pin 69
      GFD787027Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  Z9

  10. Z9 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1551E Pin 69
      GFD787026Courtesy of FORD MOTOR COMPANY
      		 C1657 Pin 1

    Is the resistance less than 3 ohms? 

    Yes  GO to  Z10
    No  REPAIR the circuit.

  11. Z10 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1657 Pin 1
      GFD787026Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

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

  12. Z11 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C1551E (3.5L).

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1657 Pin 3
      GFD787027Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  Z12

  13. Z12 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1657 Pin 3
      GFD787026Courtesy of FORD MOTOR COMPANY
      		 C1551E Pin 118

    Is the resistance less than 3 ohms? 

    Yes  GO to  Z13
    No  REPAIR the circuit.

  14. Z13 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1657 Pin 3
      GFD787026Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  Z14
    No  REPAIR the circuit.

  15. Z14 CHECK THE ENGINE OIL PRESSURE SENSOR RETURN CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1657 Pin 2
      GFD787026Courtesy of FORD MOTOR COMPANY
      		 C1551E Pin 5

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new engine oil pressure sensor. REFER to: Engine Oil Pressure (EOP) Sensor . CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the low engine oil pressure warning indicator is still always on, REFER to: Electronic Engine Controls .
    No  REPAIR the circuit.
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