Drivetrain Control Module (Dtcm) - Electrical Diagnostics - 1500, 2500 & 3500: Other RAM Pickup 2500

When Monitored

With the ignition on.

Set Condition

The DTC will set if the stored tire size is out of range as received from the Totally Integrated Power Module (TIPM).

Possible Causes

Ignition on. Battery voltage between 9 and 16 volts. No Range Position Sensor low or high voltage conditions present.

During a blocked shift attempt, motor current indicates motor movement, but the sensor value change is less than a specified value.

Scheme 142

Scheme 143

Scheme 144

1. DTC IS ACTIVE NOTE: If DTCs C1403 and C1407 are both present, refer to the diagnostics for C1407 before continuing with this procedure. Ignition on, engine not running. NOTE: Repair any system undervoltage or overvoltage DTCs that are set in this module before proceeding. With the scan tool, read DTCs. Is the DTC status Active at this time? Yes Go To 2 . No Go To 5 .
2. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT HIGH RESISTANCE OR OPEN Turn the ignition off to the lock position. Disconnect the Shift Motor/Mode Sensor Assembly harness connector. Disconnect the DTCM C1 harness connector. Measure the resistance of the (K594) Drivetrain Sensor Return circuit between the Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector. Is the resistance above 5.0 Ohms? Yes Repair the high resistance or open in the (K594) Drivetrain Sensor Return circuit. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT VOLTAGE CHECK Connect the DTCM C1 harness connector. Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K504) Drivetrain Sensor Return circuit at the Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. With the scan tool, read the T-Case Position Sensor voltage. The displayed voltage should be between 4.5 volts and 5.5 volts with the jumper wire in place. Does the voltage display as described? Yes Go To 4 . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
4. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT VOLTAGE CHECK Turn the ignition off to the lock position Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K594) Drivetrain Sensor Return circuit at the Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. With the scan tool, read the T-Case Position Sensor voltage. The displayed voltage should be between 0.0 volts and 0.4 of a volt with the jumper wire in place. Does the voltage display as described? Yes Replace the Transfer Case Motor Mode Sensor in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
5. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

With the ignition on and no system undervoltage or overvoltage or supply voltage low conditions present.

Sensor input voltage is below a specified value for a calibrated amount of time.

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

1. T-CASE POSITION SENSOR VOLTAGE BELOW 0.4 VOLTS NOTE: If DTCs C1404 and C2112 are both present, refer to the diagnostics procedure for C2112 before continuing. Ignition on, engine not running. With the scan tool, read the T-Case Position Sensor voltage in the DTCM. Is the voltage below 0.4 of a volt? Yes Go To 2 . No Go To 8 .
2. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT VOLTAGE CHECK Turn the ignition off to the lock position. Disconnect the Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Shift Motor/Mode Sensor Assembly harness connector. Choose an answer that matches the voltage measured? Below 4.5 volts Go To 3 . Above 5.5 volts Go To 4 . Between 4.5 volts and 5.5 volts Go To 5 .
3. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT FOR AN OPEN OR HIGH RESISTANCE Turn the ignition off to the lock position. Disconnect the DTCM C1 harness connector. Measure the resistance of the (K504) Drivetrain 5-volt Supply circuit between the DTCM C1 and the Shift Motor/Mode Sensor Assembly harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (K504) Drivetrain 5-volt Supply circuit for an open or high resistance. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Shift Motor/Mode Sensor Assembly harness connector. Is the voltage above 5.5 volts? Yes Repair the (K504) Drivetrain 5-volt Supply circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 5 .
5. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off to the lock position. Disconnect the DTCM C1 harness connector. Measure the resistance between ground and the (T313) Mode Sensor Signal circuit at the Shift Motor/Mode Sensor Assembly harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (T313) Mode Sensor Signal circuit for a short to ground. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 6 .
6. (T313) MODE SENSOR SIGNAL CIRCUIT OPEN Measure the resistance of the (T313) Mode Sensor Signal circuit between the DTCM C1 harness connector and the Shift Motor/Mode Sensor Assembly harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (T313) Mode Sensor Signal circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 7 .
7. TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY Turn the ignition off to the lock position. Connect the DTCM C1 harness connector. Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K504) Drivetrain 5 volt supply circuit at the Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. With the scan tool, read the T-Case Position Sensor voltage in the DTCM. The displayed voltage should be between 4.5 volts and 5.5 volts with the jumper wire in place. Does the voltage display as described? Yes Replace the Shift Motor/Mode Sensor in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
8. 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

With the ignition on and no system undervoltage or overvoltage condition present.

The sensor voltage is above a specified value for a calibrated amount of time.

Scheme 150

1. T-CASE POSITION SENSOR VOLTAGE ABOVE 4.8 VOLTS NOTE: If DTCs C1405 and C2112 are both present, refer to the diagnostics procedure for C2112 before continuing. Ignition on, engine not running. With the scan tool, read the T-Case Position Sensor voltage in the DTCM. Is the voltage above 4.8 volts? Yes Go To 2 . No Go To 6 .
2. (K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Turn the ignition off to the lock position. Disconnect the Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. Measure the voltage of the (K504) Drivetrain 5 Volt Supply circuit at the Transfer Case Encoder harness connector. Is the voltage above 5.5 volts? Yes Repair the (K504) Drivetrain 5 Volt Supply circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (T313) MODE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (T313) Mode Sensor Signal circuit at the Shift Motor/Mode Sensor Assembly harness connector. Is the voltage above 5.5 volts? Yes Repair the (T313) Mode Sensor Signal circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT OPEN Disconnect the DTCM harness connector. Measure the resistance of the (K594) Drivetrain Sensor Return circuit between the Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (K594) Drivetrain Sensor Return circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 5 .
5. TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY Turn the ignition off to the lock position. Connect a jumper wire between the (K594) Drivetrain Sensor Return circuit and the (T313) Mode Sensor Signal circuit in the Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. With the scan tool, read the T-Case Position Sensor voltage in the DTCM. NOTE: Remove the jumper wire before continuing. Is the voltage below 0.2 of a volt? Yes Replace the Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
6. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

With the ignition on and no system undervoltage or overvoltage condition present.

1. The Drive Train Control Module (DTCM) detects an excessive voltage variation on the Shift Motor/Mode Sensor Signal circuit.

2. The Drive Train Control Module (DTCM) performs an error correction procedure too frequently.

Scheme 151

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, record and erase DTCs. Start the engine and allow it to idle. With the scan tool, read DTCs. Is the status Active for this DTC? Yes Go To 2 . No Go To 3 .
2. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT VOLTAGE Ignition on, engine not running. Connect a 12-volt test light between the (T301) Switched Battery Solenoid Supply circuit and the (T310) Transfer Case Motor Lock Signal at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. NOTE: As a failsafe precaution when the Transfer Case Motor harness connectors are disconnected, the DTCs must be erased in the DTCM. Failure to follow this will result in the DTCM detecting this condition and turning OFF the Switched Battery Solenoid Supply circuit. Using the scan tool, erase the DTCs. With the scan tool, actuate the T-Case Motor Solenoid Lock in the DTCM. NOTE: Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Replace the Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
3. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

With the ignition on and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) detects that the Transfer Case Motor Lock circuit diagnostic input is low when output is off.

Scheme 152

1. DTC IS ACTIVE Turn the ignition off to the lock position. With the scan tool, record and erase DTCs. Start the engine and allow it to idle. With the scan tool, read DTCs. Is the status Active for this DTC? Yes Go To 2 . No Go To 4 .
2. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off to the lock position. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Disconnect the DTCM C1 harness connector. Measure the resistance between ground and the (T301) Switched Battery Solenoid Supply circuit. Is the resistance below 5.0 Ohms? Yes Repair the (T301) Switched Battery Solenoid Supply circuit for a short to ground. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT VOLTAGE Ignition on, engine not running. Connect a 12-volt test light between the (T301) Switched Battery Solenoid Supply circuit and the (T310) Transfer Case Motor Lock Signal at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. NOTE: As a failsafe precaution when the Transfer Case Shift Motor/Mode Sensor Assembly harness connector is disconnected, the DTCs must be cleared in the DTCM. Failure to follow this will result in the DTCM detecting this condition and turning OFF the Switched Battery Solenoid Supply circuit. Using the scan tool, erase DTCs. With the scan tool, actuate the T-Case Motor Solenoid Lock in the DTCM. NOTE: Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Replace the Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
4. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

With the ignition on and no undervoltage or overvoltage condition present.

The Drive Train Control Module detects that the Transfer Case Motor Lock circuit diagnostic input is high when the output is on.

Scheme 153

Scheme 154

Scheme 155

Scheme 156

1. VERIFY THE DTC IS ACTIVE Ignition on, engine not running. With the scan tool, record and erase DTCs. Test drive the vehicle. Ignition on, engine not running. With the scan tool, read DTCs. Is the DTC active at this time? Yes Go To 2 . No Go To 7 .
2. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Disconnect the DTCM C1 harness connector. Measure the resistance of the (T301) Switched Battery Solenoid Supply circuit between the Transfer Case Motor harness connector and the DTCM C1 harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (T301) Switched Battery Solenoid Supply circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (T310) TRANSFER CASE MOTOR LOCK SIGNAL CIRCUIT OPEN Measure the resistance of the (T310) Transfer Case Motor Lock Signal circuit between the Transfer Case Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (T310) Transfer Case Shift Motor/Mode Sensor Assembly Lock Signal circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT SHORTED TO VOLTAGE Ignition on, engine not running. Measure the voltage of the (T301) Switched Battery Solenoid Supply circuit in the Transfer Case Motor harness connector. Is any voltage present? Yes Repair the (T301) Switched Battery Solenoid Supply circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 5 .
5. TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY Turn the ignition off to the lock position. Connect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Measure the resistance of the (T310) Transfer Case Motor Lock Signal circuit and the (T301) Switched Battery Solenoid Supply in the DTCM C1 harness connector. Is the resistance greater than 20 Ohms? Yes Replace the Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 6 .
6. DRIVE TRAIN CONTROL MODULE (DTCM) Connect the DTCM C1 harness connector. Ignition on, engine not running. With the scan tool, erase DTCs. With the scan tool, read DTCs. Does the DTC remain active? Yes Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to «MODULE, Drivetrain Control , Removal»(ref-457810-S27230606582012030200000) . Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 7 .
7. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

C140A-TRANSFER CASE MOTOR PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and no undervoltage or overvoltage condition present.

A faulted condition is detected in the H-bridge driver.

Scheme 157

Scheme 158

Scheme 159

1. DTC ACTIVE Ignition on, engine not running. With the scan tool, record and erase DTCs. Test drive the vehicle. Ignition on, engine not running. With the scan tool, read DTCs. Is DTC active? Yes Go To 2 . No Go To 5 .
2. (T315) STEP MOTOR CONTROL A CIRCUIT SHORTED TO GROUND Turn the ignition off to the lock position. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Disconnect the DTCM C2 harness connector. Ignition on, engine not running. Measure the resistance between ground and the (T315) Step Motor Control A circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (T315) Step Motor Control A circuit for a short to ground. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (T316) STEP MOTOR CONTROL B CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (T316) Step Motor Control B circuit at the Transfer Case Motor/Mode Sensor Assembly harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (T316) Step Motor Control B circuit for a short to ground. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (T315) STEP MOTOR CONTROL A CIRCUIT SHORTED TO THE (T316) SHIFT MOTOR CONTROL B CIRCUIT Measure the resistance between the (T315) Step Motor Control A circuit and the (T316) Step Motor Control B circuit at the Transfer Case Motor/Mode Sensor Assembly harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (T315) Step Motor Control A circuit and the (T316) Step Motor Control B circuit for a short. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
5. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test complete.

C140D-TRANSFER CASE MOTOR CONTROL CIRCUIT OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) detects an open circuit on one of the Transfer Case Shift Motor/Mode Sensor Assembly Control circuits.

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, record and erase DTCs. Test drive the vehicle. Ignition on, engine not running. With the scan tool, read DTCs. Is the status Active for this DTC? Yes Go To 2 . No Go To 7 .
2. (T315) STEP MOTOR CONTROL A CIRCUIT OPEN Turn the ignition off to the lock position. Disconnect the Transfer Case Motor harness connector. Disconnect the DTCM C2 harness connector. Measure the resistance of the (T315) Step Motor Control A circuit from the Transfer Case Motor harness connector to the DTCM C2 harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (T315) Step Motor Control B circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (T316) STEP MOTOR CONTROL B CIRCUIT OPEN Measure the resistance of the (T316) Step Motor Control C circuit from the Transfer Case Motor harness connector to the Final Drive Control Module C2 harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (T316) Step Motor Control C circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (T315) STEP MOTOR CONTROL A CIRCUIT SHORTED TO VOLTAGE Ignition on, engine not running. Measure the voltage of the (T315) Step Motor Control A circuit at the Transfer Case Motor harness connector. Is the voltage above 0.5 of a volt? Yes Repair the (T315) Step Motor Control A circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 5 .
5. (T316) STEP MOTOR CONTROL B CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (T316) Step Motor Control B circuit at the Transfer Case Motor harness connector. Is the voltage above 0.5 of a volt? Yes Repair the (T316) Step Motor Control B circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 6 .
6. TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY Connect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Measure the resistance between the (T315) Step Motor Control A circuit and the (T316) Step Motor Control B circuit at the Final Drive Control Module C2 harness connector. Is the resistance below 5.0 Ohms? Yes Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Replace the shorted Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) .
7. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

C140E-TRANSFER CASE MOTOR BLOCKED

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) is unable to engage the requested range.

C140F-TRANSFER CASE RANGE POSITION SENSOR ERRATIC PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) detects excessive voltage fluctuation on the Mode Sensor Signal circuit.

Scheme 165

Scheme 166

Scheme 167

1. DTC IS ACTIVE NOTE: This DTC sets when the Drive Train Control Module (DTCM) detects excessive voltage fluctuation on the Mode Sensor Signal circuit. Perform a thorough inspection of all wiring and connectors between the sensor and the control module. Ignition on, engine not running. With the scan tool, record and erase DTCs. Test drive the vehicle Ignition on, engine not running. With the scan tool, read DTCs. Is the status Active for this DTC? Yes Go To 2 . No Go To 14 .
2. (K504) DRIVETRAIN 5-VOLT SUPPLY VOLTAGE ERRATIC NOTE: This DTC sets when the Drive Train Control Module (DTCM) detects excessive voltage fluctuation on the Mode Sensor Signal circuit. Perform a thorough inspection of all wiring and connectors between the sensor and the control module. Turn the ignition off to the lock position. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. NOTE: Voltage should be approximately 5.0 volts and steady. Compare any slight fluctuations found to a known good circuit in order to verify voltmeter functionality. Is the voltage approximately 5.0 volts and steady? Yes Go To 6 . No Go To 3 .
3. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT INTERMITTENT SHORT TO VOLTAGE Turn the ignition off to the lock position Disconnect the DTCM C1 harness connector. Ignition on, engine not running. Measure the voltage of the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Monitor the voltmeter while performing a wiggle test on the wiring harness and connectors. Is any voltage detected on the circuit during the wiggle test? Yes Repair the (K504) Drivetrain 5-volt Supply circuit for an intermittent short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT HIGH RESISTANCE Measure the resistance of the (K504) Drivetrain 5-volt Supply circuit between the Transfer Case Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector. Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors. Is the resistance ever above 5.0 Ohms during the wiggle test? Yes Repair the (K504) Drivetrain 5-volt Supply circuit for an intermittent open circuit or high resistance. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 5 .
5. (K504) DRIVETRAIN 5-VOLT SUPPLY CIRCUIT INTERMITTENT SHORT TO GROUND Measure the resistance between ground and the (K504) Drivetrain 5-volt Supply circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors. Is the resistance ever below 5.0 Ohms during the wiggle test? Yes Repair the (K504) Drivetrain 5-volt Supply circuit for an intermittent short to ground. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
6. TRANSFER CASE POSITION SENSOR VOLTAGE Turn the ignition off to the lock position Connect the DTCM C1 harness connector. Connect a jumper wire between the (T313) Mode Sensor Signal circuit and the (K594) Drivetrain Sensor Return circuit in the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Ignition on, engine not running. With the scan tool read the T-Case Position Sensor Voltage in the DTCM while performing a wiggle test on the wiring harness and connectors between the Transfer Case Shift Motor/Mode Sensor Assembly and the DTCM. NOTE: Voltage should be approximately 0.0 volts and steady. Is the T-Case Position Sensor Voltage approximately 0.0 volts and steady? Yes Go To 12 . No Go To 7 .
7. (T313) MODE SENSOR SIGNAL CIRCUIT INTERMITTENT SHORT TO VOLTAGE NOTE: Remove the previously installed jumper wire. Turn the ignition off to the lock position. Disconnect the DTCM C1 harness connector. Ignition on, engine not running. Measure the voltage of the (T313) Mode Sensor Signal circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Monitor the voltmeter while performing a wiggle test on the wiring harness and connectors. Is any voltage detected on the circuit during the wiggle test? Yes Repair the (T313) Mode Sensor Signal circuit for an intermittent short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 8 .
8. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT INTERMITTENT SHORT TO VOLTAGE Measure the voltage of the (K594) Drivetrain Sensor Return circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Monitor the voltmeter while performing a wiggle test on the wiring harness and connectors. Is any voltage detected on the circuit during the wiggle test? Yes Repair the (K594) Drivetrain Sensor Return circuit for an intermittent short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 9 .
9. (T313) MODE SENSOR SIGNAL CIRCUIT HIGH RESISTANCE Turn the ignition off to the lock position. Measure the resistance of the (T313) Mode Sensor Signal circuit between the Transfer Case Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector. Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors. Is the resistance ever above 5.0 Ohms during the wiggle test? Yes Repair the (T313) Mode Sensor Signal circuit for an intermittent open circuit or high resistance. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 10 .
10. (K594) DRIVETRAIN SENSOR RETURN CIRCUIT HIGH RESISTANCE Measure the resistance of the (K594) Drivetrain Sensor Return circuit between the Transfer Case Shift Motor/Mode Sensor Assembly harness connector and the DTCM C1 harness connector. Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors. Is the resistance ever above 5.0 Ohms during the wiggle test? Yes Repair the (K594) Drivetrain Sensor Return circuit for an intermittent open circuit or high resistance. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 11 .
11. (T313) MODE SENSOR SIGNAL CIRCUIT INTERMITTENT SHORT TO GROUND Measure the resistance between ground and the (T313) Mode Sensor Signal circuit at the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Monitor the ohmmeter while performing a wiggle test on the wiring harness and connectors. Is the resistance ever below 5.0 Ohms during the wiggle test? Yes Repair the (T313) Mode Sensor Signal circuit for an intermittent short to ground. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 12 .
12. DRIVE TRAIN CONTROL MODULE (DTCM) NOTE: This DTC sets when the Drive Train Control Module (DTCM) detects excessive voltage fluctuation on the Mode Sensor Signal circuit. Perform a thorough inspection of all wiring and connectors between the sensor and the control module. Using the schematic as a guide, inspect the Drive Train Control Module (DTCM) power and ground circuits. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 13 .
13. TRANSFER CASE SHIFT MOTOR/MODE SENSOR ASSEMBLY Replace the Transfer Case Shift Motor/Mode Sensor Assembly in accordance with the Service Information. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . Test drive the vehicle. With the scan tool, read the DTCs in the DTCM. Does this DTC reset? Yes Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test complete.
14. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Test complete.

With the ignition on and no system undervoltage or overvoltage condition present.

1. Current reading greater than 1A for 200 msec with no motor activation.

2. Current reading never greater than 1A during a completed range or neutral shift.

The ignition on, engine running. No Under/Overvoltage, and/or encoder error DTCs present. When shifted into 4-Low or in 4-high (if equipped).

The Drive Train Control Module (DTCM) is unable to fully lock the T-Case (in Either High or Low) (if equipped) because the T-Case clutch is worn.

With the ignition on.

A calibrated motor abuse temperature limit has been achieved. The Drive Train Control Module (DTCM) monitors the motor use and has determined that excessive motor activations have occurred. This DTC will be stored after Transfer Case Motor has cooled down.

The solenoid is active, no solenoid supply circuit DTCs are present and the battery voltage is normal.

The Drive Train Control Module (DTCM) detects the Transfer Case Motor is shorted low.

Scheme 168

Scheme 169

1. VERIFY THE DTC IS ACTIVE Ignition on, engine not running. With the scan tool, record and erase the DTCs. Cycle the ignition from off to on. With the scan tool, read the DTCs. Is the DTC active at this time? Yes Go To 2 . No Go To 7 .
2. TRANSFER CASE GROUND OPEN NOTE: Make sure there is no gasket between the transmission and the transfer case. Turn the ignition off to the lock position Measure the resistance between the Transfer Case Housing and Chassis ground. Is the resistance above 5.0 Ohms? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT SHORTED TO GROUND Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Disconnect the DTCM C1 harness connector. Measure the resistance between ground and the (T301) Switched Battery Solenoid Supply circuit in the Transfer Case Motor harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (T301) Switched Battery Solenoid Supply circuit for a short to ground. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position Measure the resistance of the (T301) Switched Battery Solenoid Supply circuit(s) between the Transfer Case Motor harness connector and the DTCM C1 harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (T301) Switched Battery Solenoid Supply circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 5 .
5. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT OPEN TO GROUND Turn the ignition off to the lock position. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Measure the resistance between the Transfer Case housing and the (T301) Switched Battery Solenoid Supply circuit. Is the resistance between 1.2 and 2.2 Ohms? Yes Go To 6 . No Replace the Clutch Coil in accordance with the Service Information. Refer to appropriate Service Information . Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
6. DRIVE TRAIN CONTROL MODULE (DTCM) NOTE: Before continuing, check the DTCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to «MODULE, Drivetrain Control , Removal»(ref-457810-S27230606582012030200000) . Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
7. INTERMITTENT WIRING HARNESS AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring harness and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset. Were there any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test Complete.

The solenoid is active, no solenoid supply circuit DTCs are present and the battery voltage is normal.

The Drive Train Control Module (DTCM) detects the Transfer Case Motor is shorted to voltage.

Note. If any other DTCs are present, repair them first before continuing with this diagnostic procedure.

Scheme 170

1. VERIFY THE DTC IS ACTIVE Ignition on, engine not running. With the scan tool, record and erase the DTCs. Cycle the ignition from off to on. With the scan tool, read the DTCs. Is the DTC active at this time? Yes Go To 2 . No Go To 7 .
2. TRANSFER CASE GROUND OPEN NOTE: Make sure there is no gasket between the transmission and the transfer case. Turn the ignition off to the lock position Measure the resistance between the Transfer Case Housing and Chassis ground. Is the resistance above 5.0 Ohms? Yes Repair as necessary. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 3 .
3. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT SHORTED TO VOLTAGE Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Disconnect the DTCM C1 harness connector. Ignition on, engine not running. Measure the voltage of the (T301) Switched Battery Solenoid Supply circuit in the Transfer Case Motor harness connector. Is any voltage present? Yes Repair the (T301) Switched Battery Solenoid Supply circuit for a short to voltage. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 4 .
4. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT OPEN Turn the ignition off to the lock position Measure the resistance of the (T301) Switched Battery Solenoid Supply circuit(s) between the Transfer Case Motor harness connector and the DTCM C1 harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (T301) Switched Battery Solenoid Supply circuit for an open. Perform the TRANSFER CASE VERIFICATION TEST. Refer to «TRANSFER CASE VERIFICATION TEST»(ref-457881-S15365005772012030200000) . No Go To 5 .
5. (T301) SWITCHED BATTERY SOLENOID SUPPLY CIRCUIT OPEN TO GROUND Turn the ignition off to the lock position. Disconnect the Transfer Case Shift Motor/Mode Sensor Assembly harness connector. Measure the resistance between the Transfer Case housing and the (T301) Switched Battery Solenoid Supply circuit. Is the resistance between 1.2 and 2.2 Ohms? Yes Go To 6 . No Replace the Clutch Coil in accordance with the Service Information. Refer to appropriate Service Information . Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
6. DRIVE TRAIN CONTROL MODULE (DTCM) NOTE: Before continuing, check the DTCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Refer to «MODULE, Drivetrain Control , Removal»(ref-457810-S27230606582012030200000) . Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
7. INTERMITTENT WIRING HARNESS AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring harness and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset. Were there any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test Complete.

Continuously.

The Drive Train Control Module (DTCM) detects the Front Axle Lock Control circuit is shorted low or open.

Scheme 171

Scheme 172

Scheme 173

1. ACTIVE DTC Ignition on, engine not running. With the scan tool, record and erase DTCs. With the scan tool, read DTCs. Is the status Active for this DTC? Yes Go To 2 . No Go To 6 .
2. (F942) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE Turn the ignition off to the lock position. Disconnect the FAD Module harness connector. Disconnect the DTCM harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, check the (F942) Fused Ignition Run/Start Control Output circuit at the DTCM C1 harness connector and the FAD Module 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? Yes Go To 3 . No Repair the (F942) Fused Ignition Run/Start Control Output circuit for an open or high resistance. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
3. (G304) FRONT AXLE LOCK CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off to the lock position. Measure the resistance between ground and the (G304) Front Axle Lock Control circuit at the DTCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (G304) Front Axle Lock Control circuit for a short to ground. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 4 .
4. (G304) FRONT AXLE LOCK CONTROL CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (G304) Front Axle Lock Control circuit between the DTCM C1 harness connector and the FAD Module harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (G304) Front Axle Lock Control circuit for an open or high resistance. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 5 .
5. DRIVE TRAIN CONTROL MODULE (DTCM) Turn the ignition off to the lock position. Replace the Front Axle Disconnect (FAD) Module in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . Ignition on, engine not running. With the scan tool, clear DTCs in the DTCM. Test drive the vehicle. During the test drive, move the Transfer Case Selector Switch (if equipped) to each position several times in accordance with the Service Information. With the scan tool, read DTCs in the DTCM. Does this DTC reset? Yes Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test Complete.
6. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times (if equipped). Look for the data to change other than as expected or for the DTC to reset. Were there any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test Complete.

Continuously.

The Drive Train Control Module (DTCM) detects the Front Axle Lock Control circuit is shorted high.

Scheme 174

1. ACTIVE DTC Ignition on, engine not running. With the scan tool, erase DTCs. With the scan tool, read DTCs. Is the status Active for this DTC? Yes Go To 2 . No Go To 6 .
2. (G304) FRONT AXLE LOCK CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off to the lock position. Disconnect the FAD Module harness connector. Disconnect the DTCM C1 harness connector. Ignition on, engine not running. Measure the voltage between ground and the (G304) Front Axle Lock Control circuit at the DTCM C1. Is any there voltage present? Yes Repair the short to voltage in the (G304) Front Axle Lock Control circuit. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 3 .
3. FRONT AXLE DISCONNECT (FAD) MODULE SHORTED TO VOLTAGE Turn the ignition off to the lock position. Connect the FAD Module harness connector. Ignition on, engine not running. Measure the voltage between ground and the (G304) Front Axle Lock Control circuit at the DTCM C1 harness connector. Is any there voltage present? Yes Go To 5 . No Go To 4 .
4. DRIVE TRAIN CONTROL MODULE (DTCM) Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit. Were any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
5. FRONT AXLE DISCONNECT (FAD) MODULE Using the wiring diagram/schematic as a guide, inspect all wiring and connectors that pertain to this circuit. Were any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Replace the Front Axle Disconnect (FAD) Module in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
6. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times (if equipped). Look for the data to change other than as expected or for the DTC to reset. Were there any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test Complete.

Ignition on.

The Drive Train Control Module (DTCM) detects an overheat condition due to excessive difference in speed across the Transfer Case from hard driving conditions (Mud, Sand, Snow, 2WD Chassis dynamometer etc.).

Ignition on.

The Drive Train Control Module (DTCM) detects an overheat condition due to excessive difference in speed across the Transfer Case from hard driving conditions (Mud, Sand, Snow, 2WD Chassis dynamometer etc.).

C147B-FRONT AXLE DISCONNECT SENSOR CIRCUIT PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Continuously.

The Drive Train Control Module (DTCM) detects the Front Axle Lock Control circuit is shorted low.

Scheme 175

Scheme 176

Scheme 177

1. ACTIVE DTC Ignition on, engine not running. With the scan tool, record and erase DTCs. With the scan tool, read DTCs. Is the status Active for this DTC? Yes Go To 2 . No Go To 9 .
2. (F942) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE Turn the ignition off to the lock position. Disconnect the FAD Module harness connector. Disconnect the DTCM C1 harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, check the (F942) Fused Ignition Run/Start Control Output circuit at the FAD Module harness connector and the DTCM C1 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? Yes Go To 3 . No Repair the (F942) Fused Ignition Run/Start Control Output circuit for an open or high resistance. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
3. (G303) FRONT AXLE LOCK SIGNAL CIRCUIT SHORTED TO VOLTAGE Measure the voltage between ground and the (G303) Front Axle Lock Signal circuit at the DTCM harness connector. Is any there voltage present? Yes Repair the (G304) Front Axle Lock Control circuit for a short to voltage. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 4 .
4. (G303) FRONT AXLE LOCK SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off to the lock position. Measure the resistance between ground and the (G303) Front Axle Lock Signal Control circuit at the DTCM harness connector. Is the resistance below 5.0 Ohms? Yes Repair the (G303) Front Axle Lock Signal circuit for a short to ground. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 5 .
5. (G303) FRONT AXLE LOCK SIGNAL CIRCUIT OPEN Measure the resistance of the (G303) Front Axle Lock Signal circuit between the DTCM harness connector and the FAD Module harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (G303) Front Axle Lock Signal circuit for an open or high resistance. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 6 .
6. (G304) FRONT AXLE LOCK CONTROL CIRCUIT OPEN Measure the resistance of the (G304) Front Axle Lock Control circuit between the DTCM harness connector and the FAD Module harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (G304) Front Axle Lock Control circuit for an open or high resistance. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 7 .
7. (T315) SHIFT MOTOR CONTROL A CIRCUIT SHORTED TO VOLTAGE Turn the ignition off to the lock position. Disconnect the Transfer Case Motor (AWD) C1 harness connector. Ignition on, engine not running. Measure the voltage between the (T315) Shift Control Motor A circuit and ground. Is there any voltage present? Yes Repair the (T315) Shift Motor Control A circuit for a short to voltage. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Go To 8 .
8. (T316) SHIFT CONTROL MOTOR B CIRCUIT SHORTED TO VOLTAGE Measure the voltage between the (T316) Shift Control Motor B circuit and ground. Is there any voltage present? Yes Repair the (T316) Shift Control Motor B circuit for a the to voltage. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Replace the Drive Train Control Module (DTCM) in accordance with the Service Information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
9. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times. Look for the data to change other than as expected or for the DTC to reset. Were there any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test Complete.

With the ignition on and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) detects excessive voltage fluctuation on the Mode Sensor Signal circuit.

Continuously.

The Drive Train Control Module (DTCM) detects that system voltage is below 8.5 volts for 60 seconds with engine RPM greater than 1500.

Scheme 178

1. CHARGING SYSTEM DTCS PRESENT Ignition on, engine not running. With the scan tool, read DTCs in the PCM. Are there any Charging System or related voltage DTCs present? Yes Perform the appropriate charging system or battery diagnostic procedure. Refer to appropriate Electrical Diagnostics Information . No Go To 2 .
2. DTC IS ACTIVE With the scan tool, read DTCs in the DTCM. Is the status Active for this DTC? Yes Go To 3 . No Go To 5 .
3. (F942) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE Turn the ignition off to the lock position. Disconnect the FAD Module harness connector. Disconnect the DTCM C1 harness connector. Ignition on, engine not running. Using a 12-volt test light connected to ground, check the (F942) Fused Ignition Run/Start Control Output circuit at the DTCM C1 harness connector and the FAD Module 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? Yes Go To 4 . No Repair the (F942) Fused Ignition Run/Start Control Output circuit for an open or high resistance. Inspect the related fuse. If the fuse is open, check the circuit for an open. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
4. (Z908) GROUND CIRCUIT OPEN OR HIGH RESISTANCE Turn the ignition off to the lock position Disconnect the DTCM C2 harness connector. With a 12-volt test light connected to B+, check the (Z908) Ground circuit at the DTCM C2 harness connector and the FAD Module 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? Yes Replace the Drive Train Control Module (DTCM) in accordance with the Service information. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Repair the (Z908) Ground circuit for an open circuit or high resistance. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) .
5. INTERMITTENT WIRING HARNESS 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 harness and connectors. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit. Look for the data to change or for the DTC to reset during the wiggle test. While monitoring the scan tool data relative to this circuit, move the selector switch to each position several times (if equipped). Look for the data to change other than as expected or for the DTC to reset. Were any problems found? Yes Repair as necessary. Perform the DTCM VERIFICATION TEST. Refer to «DTCM VERIFICATION TEST»(ref-457881-S25117074812012030200000) . No Test complete.

Continuously.

The Drive Train Control Module (DTCM) detects that system voltage is above 16.0 volts for 60 seconds with engine RPM greater than 1500.

Ignition on.

The Drive Train Control Module (DTCM) detects that the Drivetrain Sensor Supply voltage is below 2.5 volts for 300 mS.

With the ignition on and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) detects that the Drivetrain Sensor Supply voltage is above 7.5 volts for 300 ms

With the ignition on.

The Drive Train Control Module (DTCM) has detected a failure internal to the controller.

The Powertrain Control Module (PCM) loses communication over the CAN C Bus circuit. The circuit is continuously monitored. One Trip fault.

Ignition run time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.

Bus messages not received from the Powertrain Control Module (ECM/PCM) for approximately two to five seconds.

Bus messages not received from the Transmission Control Module (TCM) for approximately 500ms.

Ignition run time is greater than one second.

Battery voltage between 9 and 16 volts.

Engine run time greater than three seconds.

Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

Continuously when the ignition is on.

The battery voltage between 10.0 and 16.0 Volts.

Ignition Off Draw (IOD) fuse installed.

Totally Integrated Power Module (TIPM) is configured correctly.

Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

If the Drive Train Control Module (DTCM) fails to receive bus messages from the Steering Angle Sensor (SAS) for approximately 500 ms.

With the ignition on for four seconds, no CAN BUS circuit error condition present, no lost communication with PCM condition present, and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) is receiving implausible data for transfer case gear position, engine RPM, torque, or engine coolant temperature from the PCM.

With the ignition on for 4 seconds, no CAN BUS circuit error condition present, no lost communication with TCM condition present, and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) is receiving implausible data for gear or PRNDL position from the TCM.

With the ignition on for Four seconds, no CAN BUS circuit error condition present, no lost communication with ABS condition present, and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) is receiving implausible data for vehicle speed, wheel speeds, brake switch status, longitudinal acceleration, yaw rate, or lateral acceleration from the ABS controller.

With the ignition on for four seconds, no CAN BUS circuit error condition present, no lost communication with Steering Angle Sensor (SAS) condition present, and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) is receiving implausible data for sensor status from the Steering Angle Sensor (SAS).

With the ignition on for four seconds, no CAN bus circuit error condition present, no lost communication with Totally Integrated Power Module (TIPM) condition present, and no system undervoltage or overvoltage condition present.

The Drive Train Control Module (DTCM) is receiving implausible data for ambient temperature from the TIPM.