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Transfer Case Electronic Shift Pinpoint Test 2: No Communication With The 4WD Control Module

TRANSFER CASE ELECTRONIC SHIFT PINPOINT TEST CHART (NO COMMUNICATION WITH 4WD CONTROL MODULE)

PINPOINT TEST 2 NO COMMUNICATION WITH THE 4X4 CONTROL MODULE
STEP INSPECTION ACTION
1 CHECK POWER TO 4X4 CONTROL MODULE
  • Key OFF.
  • Disconnect the 4X4 control module connectors 0318-02 and 0318-03.
  • Key ON, engine OFF (KOEO).
  • Measure the voltage between 4X4 control module 0318-02 pin 1, circuit (O), harness side and ground.
  • Measure the voltage between 4X4 control module 0318-02 pin 2, circuit (DG/LG), harness side and ground.
  • Are both voltages greater than 10 volts? 
 Yes Go to step 2.
No Repair the power supply circuit.
Test the system for normal operation.
2 CHECK 4X4 CONTROL MODULE GROUND CIRCUITS
  • Key OFF.
  • Measure the resistance between 4X4 control module 0318-02 pin 7, circuit (B), harness side and ground.
  • Measure the resistance between 4X4 control module 0318-03 pin 2, circuit (B/W), harness side and ground.
  • Are both resistances less than 5 ohms? 
 Yes Replace the 4X4 control module. See TRANSFER CASE SHIFT CONTROL MODULE REMOVAL/INSTALLATION . Test the system for normal operation.
No Repair the circuit.
Test the system for normal operation.
G03729573
G03729574
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