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Pinpoint Test X : The Low Oil Pressure Warning Indicator Is Never Or Always On (1.5L Gas Engine)

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  1. Instrument Cluster for schematic and connector information.

    Normal Operation and Fault Conditions 

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

    If the engine rpm data or oil pressure warning message is missing less than 5 seconds, the IPC defaults the low oil pressure warning indicator to the last state (on or off), based upon the last message received.

    If the engine rpm data or oil pressure warning message is missing for 5 seconds or longer, the IPC defaults the low 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 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 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 oil pressure sensor.
    PCM P0524:00 Engine Oil Pressure Too Low: No Sub Type Information Sets in the PCM when the PCM detects low oil pressure.

    Possible Sources 

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

    Visual Inspection and Pre-checks 

    • Inspect the engine for noise or other symptom indicating a base engine or low engine oil pressure concern.
    • Inspect the engine oil pressure sensor for signs of external damage.
    • Inspect the engine oil pressure sensor connector for signs of corrosion
    • Inspect the harness for damage indicating an open or short to ground.

  2. X1 CHECK THE LOW OIL PRESSURE WARNING INDICATOR OPERATION 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.

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

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

    Yes  GO to  X2
    No  INSTALL a new IPC. REFER to: Instrument Panel Cluster (IPC) .

  3. X2 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 DTC Chart: Instrument Panel Cluster (IPC) 
    No  GO to  X3

  4. X3 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 
    No  GO to  X4

  5. X4 CHECK THE TACHOMETER OPERATION

    • Start the engine.

    • NOTE: For the optional dual 4.2" message center display IPC, make sure the IPC is set to display the tachometer. The IPC and message center navigation can be found in the Owner's Literature

      Verify the tachometer operates.

    Does the tachometer operate? 

    Yes  GO to  X5
    No  GO to Pinpoint Test G 

  6. X5 CHECK THE OIL PRESSURE

    • Test the engine for low oil pressure.

    Was a low oil pressure concern detected? 

    Yes  REPAIR the low oil pressure concern. REFER to the appropriate Engine System Information.
    No  GO to  X6

  7. X6 CHECK FOR VOLTAGE AT THE OIL PRESSURE SWITCH

    • Ignition OFF.

    • Disconnect Engine Oil Pressure Sensor C1642.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD328094Courtesy of FORD MOTOR COMPANY
      		 C1642-2

    Is the voltage approximately 5 volts? 

    Yes  GO to  X7
    No  GO to  X10

  8. X7 CHECK THE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C175E (Manual Transmission).

    • Disconnect PCM C1915E (Automatic Transmission).

    • Ignition ON.

    • Measure:

      Manual Transmission 

      Positive Lead Measurement / Action Negative Lead
      C175E-17
      GFD328094Courtesy of FORD MOTOR COMPANY
      		 Ground

      Automatic Transmission 

      Positive Lead Measurement / Action Negative Lead
      Refer to C1915E-38
      GFD328094Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  X8

  9. X8 CHECK THE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:

      Manual Transmission 

      Positive Lead Measurement / Action Negative Lead
      C175E-17
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 C1642-1

      Automatic Transmission 

      Positive Lead Measurement / Action Negative Lead
      Refer to C1915E-38
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 C1642-1

    Is the resistance less than 3 ohms? 

    Yes  GO to  X9
    No  REPAIR the circuit.

  10. X9 CHECK THE OIL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1642-1
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  X14
    No  REPAIR the circuit.

  11. X10 CHECK THE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect PCM C175E (Manual Transmission).

    • Disconnect PCM C1915E (Automatic Transmission).

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD328094Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  X11

  12. X11 CHECK THE OIL PRESSURE SENSOR VREF CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:

      Manual Transmission 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 C175E-10

      Automatic Transmission 

      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Refer to C1915E-34

    Is the resistance less than 3 ohms? 

    Yes  GO to  X12
    No  REPAIR the circuit.

  13. X12 CHECK THE OIL PRESSURE SENSOR VREF CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1642-3
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  X13
    No  REPAIR the circuit.

  14. X13 CHECK THE OIL PRESSURE SENSOR RETURN CIRCUIT FOR AN OPEN

    • Measure:

      Manual Transmission 

      Positive Lead Measurement / Action Negative Lead
      C1642-2
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 C175E-5

      Automatic Transmission 

      Positive Lead Measurement / Action Negative Lead
      C1642-2
      GFD328095Courtesy of FORD MOTOR COMPANY
      		 Refer to C1915E-35

    Is the resistance less than 3 ohms? 

    Yes  INSTALL a new engine oil pressure sensor. REFER to ENGINE COOLANT TEMPERATURE (ECT) SENSOR (1.0L) or refer to ENGINE COOLANT TEMPERATURE (ECT) SENSOR (2.0L) CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the oil pressure RTT is still never or always on, GO to  X14
    No  REPAIR the circuit.

  15. X14 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

    • Ignition OFF.

    • Disconnect and inspect the PCM and all related in-line 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 and all related in-line 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) 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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