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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2772 (Engine Controls - Pinpoint Test QB: DTCS P0603 Or P1633: Keep Alive Power Through Pinpoint Test Z: Intermittent - CNG, Flex-Fuel & Gasoline) >> Pinpoint Test TG: 4x4 Low Switch (4X4LSW) And Four Wheel Drive (4WD) Switch >> Test Procedure

Test Procedure

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  1. TG1 DTC P1729, P1781: VERIFY THE 4X4L SWITCH CYCLES ON/OFF 
    NOTE: The transmission range (TR) sensor must indicate the NEUTRAL position before 4x4L shift.
    • Verify the vehicle is equipped with 4x4.
    • Verify the selector is in 4x2 or 4x4H.

    Is the selector in 2WD or 4x4H mode during the Quick Test? 

    Yes No
    GO to  TG2. VERIFY the transmission shift lever is in NEUTRAL. SELECT 2WD or 4x4H. Rerun the Quick Test.
  2. TG2 CHECK THE 4X4L CIRCUIT AN FOR INTERMITTENT FAULT 
    • Connect the scan tool.
    • Key ON Engine OFF.
    • While doing the next four steps, access the named PID below.
    • Cycle the 4x4L switch to 2WD.
    • Grasp the vehicle harness starting at the transfer case vehicle harness connector. Shake and bend a small section of the harness all the way to the PCM.
    • Tap the vehicle harness connector at the transfer case.
    • Shake and bend a small section of the harness between the Instrument Cluster connector and the PCM.
    • Access the PCM -4X4L PID.

    Did the 4x4L PID reading go ON/OFF during harness and connector movement? 

    Yes No
    KEY OFF
    ISOLATE the fault and REPAIR as necessary.    		 KEY OFF
    GO to  TG3.
  3. TG3 CHECK THE 4X4L SIGNAL VOLTAGE TO THE PCM 
    • Disconnect the PCM.
    • Key ON Engine OFF.
    • Observe the voltage between the 4x4L circuit at the PCM harness connector and the battery negative post while cycling the switch.

    Did the voltage cycle? 

    Yes No
    KEY OFF
    REPLACE the PCM. REFER to FLASH ELECTRICALLY ERASEABLE PROGRAMMABLE READ ONLY MEMORY - FLASH EEPROM .    		 KEY OFF.
    GO to  TG4.
  4. TG4 CHECK THE 4X4L CIRCUIT FOR AN OPEN IN THE HARNESS 
    • Disconnect the 4x4L switch on mechanical shift on the fly system.
    • Disconnect the GEM or the 4x4CM on the electronic shift on the fly system.
    • Measure the resistance between:
    ( + )4X4LSW Connector, Harness Side ( - )PCM Connector, Harness Side
    4x4L - Pin 2 4x4L
    • Measure the resistance between:
    ( + )GEM Connector, Harness Side ( - )PCM Connector, Harness Side
    4x4L - Pin 16 4x4L
    • Measure the resistance between:
    ( + )4x4CM Connector, Harness Side ( - )PCM Connector, Harness Side
    4x4L - Pin 9 4x4L

    Are all the resistances below 5 ohms? 

    Yes No
    GO to  TG5. REPAIR the open circuit.
  5. TG5 CHECK THE 4X4L CIRCUIT FOR A SHORT TO POWER OR GROUND IN THE HARNESS 
    • Connect the 4x4L switch on the mechanical shift on the fly system.
    • Connect the GEM or the 4x4CM on the electronic shift on the fly system.
    • Measure the resistance between:
    ( + )PCM Connector, Harness Side ( - )PCM Connector, Harness Side
    4x4L PWRGND
    VPWR 4x4L

    Are both resistances greater than 10K ohms? 

    Yes No
    REFER to the appropriate TRANSFER CASE or FOUR WHEEL DRIVE SYSTEMS articles for Four Wheel Drive Systems. REPAIR the short circuit.
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