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Pinpoint Test D: Transfer Case Actuator Circuit Tests

  1. D1: TRANSFER CASE WIRING HARNESS AND ACTUATOR LOW RESISTANCE 
    1. Set the ignition to off.
    2. Disconnect the largest wiring harness connector from the transfer case control module.
    3. Connect an ohm-meter to terminal 15 and terminal 18 of the transfer case control module wiring harness connector.
    4. Measure the resistance.

    Is the measured resistance less than 0.5 Ω?

    • Yes  : Resistance too low. GO to  D2.
    • No  : Resistance not too low. GO to  D3.
  2. D2: TRANSFER CASE ACTUATOR LOW RESISTANCE 
    1. Disconnect the wiring harness connector from the transfer case actuator.
    2. Connect an ohm-meter to terminal 1 and terminal 8 of the transfer case actuator.
    3. Measure the resistance.

    Is the measured resistance less than 0.5 Ω?

    • Yes  : Resistance too low. Install a new transfer case actuator.
    • No  : Resistance not too low. Check the transfer case actuator wiring harness for short circuit between the wires. Repair the wiring harness as necessary.
  3. D3: TRANSFER CASE WIRING HARNESS AND ACTUATOR HIGH RESISTANCE 
    1. Connect an ohm-meter to terminal 15 and terminal 18 of the transfer case control module wiring harness connector.
    2. Measure the resistance.

    Is the measured resistance greater than 15.0 Ω?

    • Yes  : Resistance too high. GO to  D4.
    • No  : Resistance not too high. GO to  D5.
  4. D4: TRANSFER CASE ACTUATOR HIGH RESISTANCE 
    1. Disconnect the wiring harness connector from the transfer case actuator.
    2. Connect an ohm-meter to terminal 1 and terminal 8 of the transfer case actuator.
    3. Measure the resistance.

    Is the measured resistance greater than 15.0 Ω?

    • Yes  : Resistance too high. Install a new transfer case actuator.
    • No  : Resistance not too high. Check the transfer case actuator wiring harness for open circuit, high resistance. Repair the wiring harness as necessary.
  5. D5: TRANSFER CASE WIRING HARNESS AND ACTUATOR SHORT CIRCUIT TO GROUND 

    1. Connect an ohm-meter to terminal 15 of the transfer case control module wiring harness connector and ground.

    2. Measure the resistance.

    Is the measured resistance infinitely high (open circuit)?

    • Yes  : No short circuit to ground. No fault found.
    • No  : Short circuit to ground. GO to  D6.
  6. D6: TRANSFER CASE ACTUATOR SHORT CIRCUIT TO GROUND 
    1. Disconnect the wiring harness connector from the transfer case actuator.
    2. Connect an ohm-meter to terminal 15 of the transfer case control module wiring harness connector and ground.
    3. Measure the resistance.

    Is the measured resistance infinitely high (open circuit)?

    • Yes  : Short circuit to ground. Install a new transfer case actuator.
    • No  : No short circuit to ground. Check the transfer case actuator wiring harness for short circuit to ground. Repair the wiring harness as necessary.
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