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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Engine Controls - Pinpoint Tests - 6.0L (99P F450/550) Diesel) >> Pinpoint Test QH: Fuel Level Input (FLI) >> Test Procedure

Test Procedure

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  1. QH1 PRELIMINARY DIAGNOSIS 
    NOTE: Diagnostic trouble code (DTC) P115A may set with a low fuel level input. If an excessively low fuel level input message is received by the PCM from the instrument cluster, the PCM limits the injection control pressure (ICP). This may cause a lack of power, rough idle, or other driveability concerns. If no additional DTCs are present, the concern may have been caused by the vehicle running too low on fuel.
    • Possible causes:
      • fuel tank empty
      • fuel tank overfilled
      • fuel control module circuitry
      • fuel control module
      • instrument cluster
      • PCM
    • Key ON, engine OFF.
    • Carry out the instrument cluster self-test.
    • Carry out the PCM self-test.

    Are any instrument cluster DTCs present or any additional PCM DTCs present? 

    Yes No
    For instrument cluster DTCs, REFER to INSTRUMENT CLUSTER .
    For additional PCM DTCs, REFER to DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS .    		 GO to  QH2.
  2. QH2 CHECK THE INSTRUMENT CLUSTER FLI PID 
    • Access the instrument cluster and monitor the FLI PID.
    • Record the FLI PID value.
    • Compare the instrument cluster FLI PID recorded value to the instrument cluster fuel gauge.

    Does the instrument cluster FLI PID correspond to the fuel gauge level? 

    Yes No
    GO to  QH3. REFER to INSTRUMENT CLUSTER to continue diagnosis of the fuel level.
  3. QH3 CHECK THE PCM FLI PID 
    • Access the PCM and monitor the FLI PID.
    • Record the FLI PID value.
    • Compare the PCM FLI PID recorded value to the instrument cluster FLI PID recorded value.

    Does the PCM FLI PID correspond to the instrument cluster FLI PID? 

    Yes No
    UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the fault. REPAIR as necessary. REFER to SYMPTOM CHARTS , if a driveability concern exists. GO to  QH4.
  4. QH4 CHECK IF A DTC IS STILL PRESENT 
    • Clear the DTCs.
    • Carry out the self-test.

    Are DTCs P0460, P0462, P0463, P115A, P2067 or P2068 present? 

    Yes No
    GO to  QH5. The test is complete.
  5. QH5 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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