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

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

    Normal Operation and Fault Conditions 

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

    If the 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 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 P0521:00 Engine Oil Pressure Sensor/Switch "A" Circuit Range/Performance: No Sub Type Information Sets in the PCM when the PCM detects signal variation outside of the module parameters on the hardwired input from the engine oil pressure switch.
    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 switch.
    PCM P0523:00 Engine Oil Pressure Sensor/Switch "A" Circuit High: No Sub Type Information Sets in the PCM when the PCM detects and open on the hardwired input from the engine oil pressure switch.
    PCM P0524:00 Engine Oil Pressure Too Low: No Sub Type Information Sets in the PCM when the PCM detects low engine oil pressure.

    Possible Sources 

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

    Visual Inspection and Pre-checks 

    • Check the engine oil level
    • Inspect the engine for noise or other symptom that indicates a low engine oil pressure concern.
    • Inspect the engine oil pressure switch for signs of external damage.
    • Inspect the engine oil pressure switch connector for signs of corrosion and inspect the harness for damage indicating a cut, open or circuit shorted to ground.

  2. NOTE: If equipped with stop-start, while the vehicle is at a stop and the engine shuts off, the engine oil pressure gauge drops to 0 and the low engine oil pressure warning indicator turns off.

  3. Y1 CARRY OUT 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 Identifications (PIDs).

    • Select the IPC low oil pressure warning indicator (OIL_P_LOW) PID.

    • Access the IPC and control the OIL_P_LOWPID

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

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

    Yes  GO to  Y2
    No  Install a new IPC. Refer to Instrument Panel Cluster (IPC) .

  4. Y2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to DTC Chart: IPC in Diagnostic Trouble Code (DTC) Chart .
    No  If the low engine oil pressure warning indicator is never on, GO to  Y3 If the low engine oil pressure warning indicator is always on, GO to  Y6

  5. Y3 CHECK FOR A STUCK CLOSED ENGINE OIL PRESSURE SWITCH

    • Ignition OFF.

    • Disconnect Engine Oil Pressure Switch C103 (3.5L GTDI).

    • Ignition ON.

    • Observe the low engine oil pressure warning indicator.

    Does the low engine oil pressure warning indicator turn on? 

    Yes  INSTALL a new engine oil pressure switch. REFER to: Oil Pressure Switch .
    No  GO to  Y4

  6. Y4 CHECK THE ENGINE OIL PRESSURE INPUT CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect PCM C1551B (3.5L GTDI).

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1551B-35
      GFD567642Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  Y5
    No  REPAIR the circuit.

  7. Y5 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to: Electronic Engine Controls .
    No  GO to  Y9

  8. Y6 CHECK FOR A STUCK OPEN ENGINE OIL PRESSURE SWITCH

    • Ignition OFF.

    • Disconnect Engine Oil Pressure Switch C103 (3.5L GTDI).

    • Connect a fused jumper wire:
      Lead 1 Measurement / Action Lead 2
      C103-1
      GFD567643Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Start the engine.

    • Observe the low engine oil pressure warning indicator.

    Does the low engine oil pressure indicator turn off? 

    Yes  REMOVE the fused jumper wire. GO to  Y7
    No  LEAVE the fused jumper wire connected. GO to  Y8

  9. Y7 CHECK THE OIL PRESSURE

    • Test the engine for low engine oil pressure.

    Was a low engine oil pressure concern detected? 

    Yes  REPAIR the low engine oil pressure concern. REFER to: Engine .
    No  INSTALL a new engine oil pressure switch. REFER to: Oil Pressure Switch .

  10. Y8 CHECK THE ENGINE OIL PRESSURE INPUT CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1551B (3.5L GTDI.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1551B-35
      GFD567642Courtesy of FORD MOTOR COMPANY
      		 C103-1

    Is the resistance less than 3 ohms? 

    Yes  REMOVE the fused jumper wire. GO to  Y9
    No  REMOVE the fused jumper wire. REPAIR the circuit.

  11. Y9 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect all PCM connectors.

    • Repair:

      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary

    • Reconnect the PCM connectors. Make sure they seat and latch correctly.

    • Operate the system and determine if the concern is still present

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to PCM GUIDED ROUTINE TESTING
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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