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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 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 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.

    Possible Sources 

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

  2. Z1 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  Z6 For DTC P0524, GO to  Z7 For all other Diagnostic Trouble Codes (DTCs), REFER the appropriate Electronic Engine Controls article.
    No  GO to  Z2

  3. Z2 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  Z3
    No  Install a new IPC. Refer to Instrument Panel Cluster (IPC) .

  4. Z3 CHECK THE TACHOMETER OPERATION

    • Start the engine.

    • Verify the tachometer operates.

    Does the tachometer operate? 

    Yes  GO to  Z4
    No  GO to Pinpoint Test F 

  5. Z4 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 IPC DTC Chart in Diagnostic Trouble Code (DTC) Chart 
    No  GO to  Z5

  6. Z5 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 is always on, GO to  Z6 If the low engine oil pressure indicator is never on, GO to  Z7

  7. Z6 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  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
      C1657-3
      GFD567644Courtesy of FORD MOTOR COMPANY
      		 C1657-2

    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-69
      GFD567644Courtesy 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-69
      GFD567642Courtesy of FORD MOTOR COMPANY
      		 C1657-1

    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
      C1657-1
      GFD567642Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  Z15
    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
      C1657-3
      GFD567644Courtesy 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
      C1657-3
      GFD567642Courtesy of FORD MOTOR COMPANY
      		 C1551E-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
      C1657-3
      GFD567642Courtesy 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
      C1657-2
      GFD567642Courtesy of FORD MOTOR COMPANY
      		 C1551E-5

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new engine oil pressure sensor. REFER to the appropriate Engine article. 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  Z15
    No  REPAIR the circuit.

  16. Z15 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, 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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