Home ReviewsRefund
Home/Dodge/Durango/Dodge Durango II (2003-2006)/Repair manual/Transfer Case/Transfer Case - Electrical Diagnostics: Overview
Contents Wiring diagrams Section: Transfer Case All sections

Transfer Case - Electrical Diagnostics: Overview Dodge Durango II

Transfer Case 11 illustrations ~1139 words

Theory Of Operation

The purpose of the Shift Motor Brake is to provide a means of physically holding the Transfer Case actuator in place.

The Shift Motor Brake consists of a solenoid which releases the Transfer Case actuator when current is applied.

The FCM applies a ground to the Shift Motor Brake to release the Transfer Case actuator

  1. Any time a shift is taking place.
  2. For a predetermined amount of time before and after the shift based on a timer.
  3. Any time a Shift Motor Brake DTC is active. No shifting will take place if either a Shift Motor Brake DTC is present or the Shift Motor Brake timer is active. While the timer is active, or if a Shift Motor Brake short to ground DTC is present, static braking is implemented to keep the actuator in place.

Scheme 1

Scheme 1: Diagnostic Test
Scheme 1: Diagnostic Test

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4
  1. T-CASE BRAKE ACTUATION Ignition on, engine not running. With the scan tool, actuate the T-Case Brake. With the scan tool, monitor the T-Case Brake State. Does the T-Case Brake State change properly as the circuit is actuated on and off? Yes : Go to 5 NO : Go to 2
  2. SHIFT MOTOR BRAKE SIGNAL CIRCUIT SHORTED TO GROUND Ignition off. Disconnect the Shift Motor/Mode Sensor Assembly connector. Measure the resistance between ground and the (T300) Shift Motor Brake Signal circuit. Is the resistance below 5.0 ohms? Yes : Repair the (T300) Shift Motor Brake Signal circuit for a short to ground. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Go to 3
  3. SHIFT MOTOR/MODE SENSOR ASSEMBLY Ignition on, engine not running. With the scan tool, actuate the T-Case Brake. Using a 12-volt test light connected to 12-volts, check the (T300) Shift Motor Brake Signal circuit. Does the test light turn on and off properly as the circuit is actuated on and off?. Yes : Replace the Shift Motor/Mode Sensor Assembly. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Go to 4
  4. FRONT CONTROL MODULE Ignition off. Disconnect the Power Distribution Module C2 connector. Measure the resistance of the (T300) Shift Motor Brake Signal circuit. Is the resistance below 5.0 ohms? Yes : Check the (T300) circuit from the FCM connector to the PDM connector. If OK, replace the Front Control Module in accordance with the Service information. If not OK, replace the Power Distribution Module. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Repair the (T300) Shift Motor Brake Signal circuit for an open. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) .
  5. INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Were any problems found? Yes : Repair as necessary. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Test complete.

Scheme 5

Scheme 5: C1408- TRANSFER CASE BRAKE CONTROL CIRCUIT HIGH
Scheme 5: C1408- TRANSFER CASE BRAKE CONTROL CIRCUIT HIGH

The purpose of the Shift Motor Brake is to provide a means of physically holding the Transfer Case actuator in place. The Shift Motor Brake consists of a solenoid which releases the Transfer Case actuator when current is applied.

The FCM applies a ground to the Shift Motor Brake to release the Transfer Case actuator

  1. Any time a shift is taking place.
  2. For a predetermined amount of time before and after the shift based on a timer.
  3. Any time a Shift Motor Brake DTC is active. No shifting will take place if either a Shift Motor Brake DTC is present or the Shift Motor Brake timer is active. While the timer is active, or if a Shift Motor Brake short to ground DTC is present; static braking is implemented to keep the actuator in place

Scheme 6

Scheme 6: Diagnostic Test
Scheme 6: Diagnostic Test

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10
  1. SHIFT MOTOR BRAKE DTC IS ACTIVE NOTE: This DTC indicates that the FCM has detected high voltage on the Shift Motor Brake Signal circuit while the Shift Motor Brake was released by the FCM during a shift. Carefully inspect the related wiring and connectors for a short to voltage. Ignition on, engine not running. With the scan tool, Clear DTCs. Move the Shift control to each position, while monitoring the Data Display on the scan tool. Does the DTC reset? Yes : Go to 2 NO : Go to 7
  2. (T300) SHIFT MOTOR BRAKE SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Shift Motor/Mode Sensor Assembly connector. Remove the Front Control Module from the Power Distribution Module. Turn the ignition on. Measure the voltage of the (T300) Shift Motor Brake Signal circuit at the Shift Motor/Mode Sensor Assembly connector. Is there any voltage present? Yes : Go to 3. NO : Go to 4
  3. POWER DISTRIBUTION MODULE Turn the ignition off. Disconnect the Power Distribution Module C1 connector. Turn the ignition on. Measure the voltage of the (T300) Shift Motor Brake Signal circuit at the Shift Motor/Mode Sensor Assembly connector. Is there any voltage present? Yes : Repair the (T300) Shift Motor Brake Signal circuit for a short to voltage. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Replace the Power Distribution Module in accordance with the Service information. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) .
  4. (T300) SHIFT MOTOR BRAKE SIGNAL CIRCUIT OPEN Measure the resistance of the (T300) Shift Motor Brake Signal circuit. Is the resistance above 5.0 ohms? Yes : Repair the (T300) Shift Motor Brake Signal circuit for an open. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Go to 5
  5. SHIFT MOTOR/MODE SENSOR ASSEMBLY Turn the ignition off. Reconnect the disconnected FCM C3 connector. Connect one end of a jumper to the (T300) Shift Motor Brake Signal circuit. While monitoring the T-Case Brake State on the scan tool, momentarily connect the other end of the jumper to ground. Does the T-Case Brake State change from Off to On when the jumper wire is connected to ground. Yes : Replace the Shift Motor/Mode Sensor Assembly. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Go to 6
  6. FRONT CONTROL MODULE View repair. Repair Replace the Front Control Module in accordance with the Service information.
  7. INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Were any problems found? Yes : Repair as necessary. Perform the «TRANSFER CASE VERIFICATION TEST-VER 1»(ref-212831-S18821027502005122700000) . NO : Test complete.

Scheme 11

Scheme 11: C140B- TRANSFER CASE MOTOR CONTROL CIRCUIT LOW
Scheme 11: C140B- TRANSFER CASE MOTOR CONTROL CIRCUIT LOW

More articles — Transfer Case - Electrical Diagnostics