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Pinpoint Test H: Transfer Case Actuator Position Sensor Signal B Circuit Tests

  1. H1: TRANSFER CASE WIRING HARNESS AND ACTUATOR POSITION SENSOR SIGNAL B 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 6 and terminal 2 of the transfer case control module wiring harness connector.
    4. Measure the resistance.

    Is the measured resistance less than 16 kΩ?

    • Yes  : Resistance too low. GO to  H2.
    • No  : Resistance not too low. GO to  H3.
  2. H2: TRANSFER CASE ACTUATOR POSITION SENSOR SIGNAL B LOW RESISTANCE 
    1. Disconnect the wiring harness connector from the transfer case actuator.
    2. Connect an ohm-meter to terminal 2 and terminal 7 of the transfer case actuator.
    3. Measure the resistance.

    Is the measured resistance less than 16 kΩ?

    • 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. H3: TRANSFER CASE WIRING HARNESS AND ACTUATOR POSITION SENSOR SIGNAL B HIGH RESISTANCE 
    1. Connect an ohm-meter to terminal 6 and terminal 2 of the transfer case control module wiring harness connector.
    2. Measure the resistance.

    Is the measured resistance greater than 20 kΩ?

    • Yes  : Resistance too high. GO to  H4.
    • No  : Resistance not too high. GO to  H5.
  4. H4: TRANSFER CASE ACTUATOR POSITION SENSOR SIGNAL B HIGH RESISTANCE 
    1. Disconnect the wiring harness connector from the transfer case actuator.
    2. Connect an ohm-meter to terminal 2 and terminal 7 of the transfer case actuator.
    3. Measure the resistance.

    Is the measured resistance greater than 20 kΩ?

    • 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. H5: TRANSFER CASE WIRING HARNESS AND ACTUATOR POSITION SENSOR SIGNAL B SHORT CIRCUIT TO GROUND 
    1. Connect an ohm-meter to terminal 6 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  H6.
  6. H6: TRANSFER CASE ACTUATOR POSITION SENSOR SIGNAL B SHORT CIRCUIT TO GROUND 
    1. Disconnect the wiring harness connector from the transfer case actuator.
    2. Connect an ohm-meter to terminal 6 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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