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Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NO RESPONSE FROM TRANSFER CASE CONTROL MODULE - DIAGNOSTIC PROCEDURE

TEST ACTION
1 Turn the ignition on.
NOTE: As soon as one or more module communicates with the DRBIII(R), answer the question.

With the DRBIII(R), attempt to communicate with the Airbag Control Module (ACM).
With the DRBIII(R), attempt to communicate with the Central Timer Module (CTM).
Was the DRBIII(R) able to I/D or establish communications with either of the modules?
  1. Yes --> Go To 2
  2. No --> Refer to the COMMUNICATION  category and perform the symptom PCI Bus Communication Failure.

    Perform TRANSFER CASE VERIFICATION TEST  .
2 Turn the ignition off to the lock position.
Disconnect the TCCM harness connectors.
Using a 12-volt test light connected to ground, check the Fused B(+) circuit in the TCCM harness connector.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?
  1. Yes --> Go To 3
  2. No --> Repair the Fused B(+) circuit for an open. If the fuse is open make sure to check for a short to ground. Refer to the SYSTEM WIRING DIAGRAMS .

    Perform TRANSFER CASE VERIFICATION TEST  .
3 Turn the ignition off to the lock position.
Disconnect the TCCM harness connectors.
Using a 12-volt test light connected to 12-volts, check each ground circuit in the TCCM harness connectors.
NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly for each Ground circuit?
  1. Yes --> Go To 4
  2. No --> Repair the Ground circuit for an open. Refer to the SYSTEM WIRING DIAGRAMS .

    Perform TRANSFER CASE VERIFICATION TEST  .
4
NOTE: Ensure there is PCI Bus communication with other modules on the vehicle before proceeding. If not, refer to the symptom list from the menu and repair as necessary.
Turn the ignition off to the lock position.Disconnect the TCCM harness connector.Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.Connect the scope input cable to the channel one connector on the DRB. Attach the red and black leads and the cable to probe adapter to the scope input cable.With the DRBIII(R) select Pep Module Tools.Select lab scope.Select Live Data.Select 12 volt square wave.Press F2 for Scope.Press F2 and use the down arrow to set voltage range to 20 volts. Set Probe to x10.Press F2 again when complete.Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus circuit in the TCCM connector.Turn the ignition on.Observe the voltage display on the DRBIII(R) Lab Scope.Does the voltage pulse from 0 to approximately 7.5 volts?
  1. Yes --> Go To 5
  2. No --> Repair the PCI Bus circuit for an open.

    Perform TRANSFER CASE VERIFICATION TEST  .
5 If there are no possible causes remaining, view repair.
  1. Repair
    1. Replace the Transfer Case Control Module in accordance with the service information.
    2. Perform TRANSFER CASE VERIFICATION TEST  .
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