Diagnostic Test

VERIFY THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, record and erase DTCs.
3. With the scan tool, read DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go To 2.
  No
  - Go To 7.
DRIVE TRAIN CONTROL RELAY
1. Turn the ignition off to the lock position.
2. Remove the Drive Train Control Relay.
3. Install a known good relay.
4. Ignition on, engine not running.
5. With the scan tool, erase DTCs.
6. Cycle the ignition.
7. With the scan tool, read DTCs.
  Does the DTC reset?
  
  Yes
  - Go To 3.
  No
  - Replace the Drive Train Control Relay.
  - Refer to Standard Procedure and perform the DTCM VERIFICATION TEST.
(F348) DRIVE TRAIN CONTROL RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: Checking Drive Train Control Relay Control Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Remove the Drive Train Control Relay.
3. Disconnect the DTCM harness connector.
4. Connect a jumper wire between the (F348) Drive Train Control Relay Control circuit and ground.
5. Ignition on, engine not running.
6. Using a 12-volt test light connected to 12-volts, check the (F348) Drive Train Control Relay Control circuit.
  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 (F348) Drive Train Control Relay Control circuit for an open or high resistance.
  - Refer to Standard Procedure and perform the DTCM VERIFICATION TEST.
(G304) FRONT AXLE LOCK CONTROL CIRCUIT SHORT TO GROUND

Fig 2: Checking Front Axle Lock Control Circuit For Short To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off to the lock position.
2. Disconnect the Front Axle Disconnect (FAD) Module harness connector.
3. Measure the resistance between ground and the (G304) Front Axle Lock Control circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (G304) Front Axle Lock Control circuit for a short to ground.
  - Refer to Standard Procedure and perform the DTCM VERIFICATION TEST.
  No
  - Go To 5.
(G304) FRONT AXLE LOCK CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Checking Front Axle Lock Control Circuit For Open Or High Resistance
Courtesy of CHRYSLER LLC
1. 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.
  - Refer to Standard Procedure and perform the DTCM VERIFICATION TEST.
  No
  - Go To 6.
DRIVE TRAIN CONTROL MODULE (DTCM)
1. 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.
  - Refer to Standard Procedure and perform the DTCM VERIFICATION TEST.
  No
  - Replace the Drive Train Control Module (DTCM) in accordance with Service Information. Refer to MODULE, Drivetrain Control , Removal .
  - Refer to Standard Procedure and perform the DTCM VERIFICATION TEST.
INTERMITTENT WIRING HARNESS AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring harness and connectors specific to this circuit.
3. Wiggle test the wiring harness and connectors while monitoring the scan tool data relative to this circuit.
4. 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.
  - Refer to Standard Procedure and perform the DTCM VERIFICATION TEST.
  No
  - Test Complete.