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Pinpoint Test AE : The Low Engine Oil Pressure Warning Indicator Is Never Or Always On (2.5L HEV (Hybrid Electric Vehicle))

  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) - 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 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 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 P0524:00 Engine Oil Pressure Too Low: No Sub Type Information Sets in the PCM when the PCM detects low engine oil pressure.
    PCM P055F:00 Engine Oil Pressure Out of Range: No Sub Type Information Sets in the PCM when the PCM detects the engine oil pressure is out of range.

    Possible Sources 

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

    Visual Inspection and Pre-checks 

    • Inspect the engine for noise or other symptoms indicating an engine or 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
    • Inspect the harness for damage indicating an open or a short to ground.

  2. AE1 IDENTIFY THE IPC (INSTRUMENT PANEL CLUSTER) LEVEL

    Is the vehicle equipped with a base IPC? 

    Yes  GO to  AE3
    No  GO to  AE2

  3. AE2 CHECK THE MESSAGE CENTER OPERATION

    • Ignition ON.

    • Close all doors, liftgate and 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  AE4
    No  GO to Pinpoint Test A 

  4. AE3 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 Identifications (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  AE4
    No  Refer to IPC Guided Routine Testing .

  5. AE4 CHECK THE TACHOMETER OPERATION

    • Start the engine.

    • Verify the tachometer operates.

    Does the tachometer operate? 

    Yes  GO to  AE5
    No  For high level IPC, GO to Pinpoint Test B  For the base or mid-level, IPC, GO to Pinpoint Test I 

  6. AE5 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 DTC Chart: IPC .
    No  If the low engine oil pressure warning indicator is never on, GO to  AE6 If the low engine oil pressure warning indicator is always on, GO to  AE8

  7. AE6 CHECK FOR A STUCK CLOSED ENGINE OIL PRESSURE SWITCH

    • Ignition OFF.

    • Disconnect Engine Oil Pressure Switch C1636.

    • Start the engine and 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.
    No  GO to  AE7

  8. AE7 CHECK THE ENGINE OIL PRESSURE INPUT CIRCUIT FOR A SHORT TO GROUND AT THE PCM (POWERTRAIN CONTROL MODULE)

    • Ignition OFF.

    • Disconnect PCM C1381E.

    • Ignition ON.

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C1381E-25
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AE13
    No  REPAIR the circuit.

  9. AE8 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: Communications Network .
    No  GO to  AE9

  10. AE9 PERFORM A PCM (POWERTRAIN CONTROL MODULE) SELF-TEST

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

    Are any Diagnostic Trouble Codes (DTCs) recorded? 

    Yes  REFER to the appropriate Electronic Engine Controls article.
    No  GO to  AE10

  11. AE10 CHECK FOR A STUCK OPEN ENGINE OIL PRESSURE SWITCH

    • Ignition OFF.

    • Disconnect Engine Oil Pressure Switch C1636.

    • Connect a fused jumper wire:
      Positive Lead Measurement / Action Negative Lead
      C1636-1
      GFD476912Courtesy of FORD MOTOR COMPANY
      		 Ground

    • Ignition ON.

    • 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  AE11
    No  LEAVE the fuse jumper wire connected. GO to  AE12

  12. AE11 CHECK THE ENGINE 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.

  13. AE12 CHECK THE ENGINE OIL PRESSURE INPUT CIRCUIT FOR AN OPEN AT THE PCM (POWERTRAIN CONTROL MODULE)

    • Ignition OFF.

    • Disconnect PCM C1381E.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1636-1
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 C1381E-25

    Is the resistance less than 3 ohms? 

    Yes  REMOVE the fused jumper wire. GO to  AE13
    No  REMOVE the fused jumper wire. REPAIR the circuit.

  14. AE13 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the 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 On-Line Automotive Service Information System (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, INSTALL a new PCM. REFER to the appropriate Electronic Engine Controls article.
    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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