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Pinpoint Test Ad : The Low Engine Oil Pressure Warning Indicator Is Never Or Always On (1.5L, 2.0L)

  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 sensor
    • GWM
    • PCM
    • IPC

  2. AD1 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 P0521, P0522 and P0523, GO to  AD9 For DTC P0524, GO to  AD8 For all other Diagnostic Trouble Codes (DTCs), REFER to the Master DTC Chart.
    No  GO to  AD2

  3. AD2 IDENTIFY THE IPC (INSTRUMENT PANEL CLUSTER) LEVEL

    Is the vehicle equipped with a base IPC? 

    Yes  GO to  AD4
    No  GO to  AD3

  4. AD3 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  AD5
    No  GO to Pinpoint Test A 

  5. AD4 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  AD5
    No  Refer to IPC Guided Routine Testing .

  6. AD5 CHECK THE TACHOMETER OPERATION

    • Start the engine.

    • Verify the tachometer operates.

    Does the tachometer operate? 

    Yes  GO to  AD6
    No  For high level IPC, GO to Pinpoint Test B  For the base or mid-level, IPC, GO to Pinpoint Test I 

  7. AD6 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  GO to  AD7

  8. AD7 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  If the low engine oil pressure indicator or RTT indicator is always on, GO to  AD8 If the low engine oil pressure indicator or RTT indicator is never on, GO to  AD9

  9. AD8 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  GO to  AD9

  10. AD9 CHECK FOR VOLTAGE AT THE ENGINE OIL PRESSURE SENSOR

    • Ignition OFF.

    • Disconnect Engine Oil Pressure Sensor C1642 (1.5L) or C1149 (2.0L).

    • Ignition ON.

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD476531Courtesy of FORD MOTOR COMPANY
      		 C1642-2

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1149-3
      GFD476531Courtesy of FORD MOTOR COMPANY
      		 C1149-2

    Is the voltage approximately 5 volts? 

    Yes  GO to  AD10
    No  GO to  AD13

  11. AD10 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C175E (1.5L) or C1551E (2.0L).

    • Ignition ON.

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C175E-21
      GFD476531Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1551E-21
      GFD476531Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  AD11

  12. AD11 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C175E-21
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 C1642-1

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1551E-21
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 C1149-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  AD12
    No  REPAIR the circuit.

  13. AD12 CHECK THE ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C1642-1
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1149-1
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AD17
    No  REPAIR the circuit.

  14. AD13 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C175E (1.5L) or C1551E (2.0L).

    • Ignition ON.

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD476531Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1149-3
      GFD476531Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  AD14

  15. AD14 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 C175E-25

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1149-3
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 C1551E-25

    Is the resistance less than 3 ohms? 

    Yes  GO to  AD15
    No  REPAIR the circuit.

  16. AD15 CHECK THE ENGINE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO GROUND

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 Ground

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1149-3
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  AD16
    No  REPAIR the circuit.

  17. AD16 CHECK THE ENGINE OIL PRESSURE SENSOR RETURN CIRCUIT FOR AN OPEN

    • Measure:

      1.5L 

      Positive Lead Measurement / Action Negative Lead
      C1642-2
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 C175E-41

      2.0L 

      Positive Lead Measurement / Action Negative Lead
      C1149-2
      GFD476530Courtesy of FORD MOTOR COMPANY
      		 C1551E-41

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new engine oil pressure sensor. CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the low engine oil pressure warning indicator is still never or always on, GO to  AD17
    No  REPAIR the circuit.

  18. AD17 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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