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Pinpoint Test B: No Communication With The Four-Wheel Drive (4WD) Control Module

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK POWER TO 4WD CONTROL MODULE 
    • Key in OFF position.
    • Disconnect: 4WD Control Module C281a.
    • Disconnect: 4WD Control Module C281b.
    • Key in ON position.
    • Measure the voltage between 4WD control module C281a, pin 1, circuit 931 (OG) and ground; and between 4WD control module C281a, pin 2, circuit 704 (DG/LG) and ground.
      Fig 1: Checking Power To 4WD Control Module
      G03276340Courtesy of FORD MOTOR CO.
    • Are both voltage measurements greater than 10 volts? 
    1. Yes  : GO to B2.
    2. No  : REPAIR the power supply as necessary. TEST the system for normal operation.
  2. B2 CHECK 4WD CONTROL MODULE GROUND CIRCUIT 
    • Key in OFF position.
    • Measure the resistance between 4WD control module C281a pin 7, circuit 57 (BK), harness side and ground; and between 4WD control module C281b pin 2, circuit 570 (BK/WH), harness side and ground.
      Fig 2: Checking 4WD Control Module Ground Circuit
      G03276341Courtesy of FORD MOTOR CO.
    • Are both resistances less than 5 ohms? 
    1. Yes  : REFER to MODULE COMMUNICATIONS NETWORK .
    2. No  : REPAIR the circuit. TEST the system for normal operation.
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