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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 977 (Four-Wheel Drive Systems (ESOF) -- F150 Pickup) >> Diagnosis And Testing >> Four-Wheel Drive Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test J: No Communication With the 4x4 Module (PCM) >> PINPOINT TEST J: NO COMMUNICATION WITH THE 4x4 MODULE (PCM)

PINPOINT TEST J: NO COMMUNICATION WITH THE 4x4 MODULE (PCM)

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.
  1. J1 CHECK FOR DIAGNOSTIC TOOL COMMUNICATION WITH THE VEHICLE 
    • Verify diagnostic tool communication with the vehicle.
      • If using the using WDS, follow the directions and carry out the network test.
      • If using NGS, verify that the correct cable is used and the vehicle and engine selection information is correct.
    • WDS: Does the network test pass for the PCM? 

      NGS: Does the diagnostic tool communicate with the PCM? 

    • Yes  : GO to  J2.
    • No  : REFER to the appropriate diagnostic tool manual for further diagnosis.
  2. J2 CHECK FOR VOLTAGE INPUT TO THE 4x4 MODULE (PCM) 
    • Disconnect: 4x4 Module (PCM) C175b.
    • Measure the voltage between C175b-12, circuit 1861 (RD), harness side and ground; and between C175b-13, circuit 1865 (WH/OG) and ground.
    • Are the voltages greater than 9 volts? 
    • Yes  : GO to  J6.
    • No  : GO to J3.
  3. J3 CHECK THE POWER DISTRIBUTION JUNCTION BOX (PDJB) MINI-FUSES 
    • Check PDJB mini-fuses 20 (15A) and 29 (15A).
    • Are the fuses okay? 
    • Yes  : GO to  J4.
    • No  : CHECK circuit 1861 (RD) and circuit 1865 (WH/OG). REPAIR as necessary. REPEAT the self-test.
  4. J4 CHECK FOR BATTERY VOLTAGE FROM THE JUNCTION BOX (JB) 
    • Key in ON position.
    • Measure the voltage between JB input side fuse cavity 20 and ground; and between JB input side fuse cavity 29 and ground.
    • Are the voltages greater than 9 volts? 
    • Yes  : REPAIR or INSTALL new components as necessary. REPEAT the self-test.
    • No  : GO to J5.
  5. J5 CHECK THE BATTERY VOLTAGE WITH THE ENGINE RUNNING 
    • Start the engine. Measure the battery voltage at the positive battery terminal.
    • Is the voltage greater than 9 volts? 
  6. J6 CHECK THE GROUND CIRCUITS FOR AN OPEN 
    • Disconnect the battery ground cable. Refer to BATTERY, MOUNTING AND CABLES .
    • Disconnect: 4x4 Module (PCM) C175b.
    • Measure the resistance between C175b-66, circuit 567 (LB/YE) and ground; and between C175b-67, circuits 570a C175b-68, circuit 570b C175b-69, circuits 570c C175b-70 circuit 570d, (BK/WH) and ground.
    • Are the resistances less than 5 ohms? 
    • Yes  : GO to  J7.
    • No  : REPAIR the affected circuit(s). REPEAT the self-test.
  7. J7 CHECK THE VOLTAGE ON GROUND CIRCUITS 
    • Measure the voltage between C175b-66, circuit 567 (LB/YE) and ground; and between C175b-67, circuit 570a, C175b-68, circuit 570b, C175b-69, circuit 570c, C175b-70, circuit 570d and ground.
    • Is voltage present? 
    • Yes  : REPAIR the affected circuit(s). REPEAT the self-test.
    • No  : Disconnect all 4x4 module (PCM) connectors. CHECK for corrosion, and/or pushed-out pins. The condition may have been caused by a loose or corroded connector. REPAIR or CLEAN as necessary.

      If not, INSTALL a new 4x4 module (integral to the PCM). REFER to ELECTRONIC ENGINE CONTROLS . TEST the system for normal operation.

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