Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECU's) and record on the repair order.
2. With the scan tool, run a Vehicle Scan Report, or record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for at least 10.0 seconds.
5. Turn the ignition on.
6. Using the recorded Environmental Data and the When Monitored Conditions above, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION diagnostic procedure. Refer to: TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (F946) FUSED IGNITION CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT
1. Disconnect the component harness connector to isolate the 12.0 volt supply circuit.
2. Connect the positive lead of the load test tool to the 12.0 volt supply circuit at the component harness connector (A). Note: refer to the diagram below.
3. Connect the negative lead of the load test tool to the ground circuit of the Battery or a good chassis ground.
4. Ensure that the circuit being tested is being powered on. If the 12.0 volt circuit being tested is an ignition feed for example, the ignition must be on. If testing an output from a relay, verify that the relay is energized and on.
5. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuitry.
  NOTE:
  Why perform a Voltage Drop Test? A load test is used to determine if a circuit is capable of carrying the amperage needed to perform properly. The 3156 bulb in the load tool illustrated, is a simple but effective method of testing circuit functionality. A 3156 Bulb has approximately 6.0 Ohms of resistance when the bulb is powered and draws approximately 2.0 amps of current. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop. Refer to: CIRCUIT LOAD TESTING PROCEDURES .
  
  NOTE:
  A 12-volt test light can be substituted for the load test tool, but only if the test light draws enough current to effectively load test the circuit. Many high impedance test lights draw very little amperage (less than 0.1 amps) and are not reliable to load test a circuit. To perform a proper load test of a circuit, the tool being used should draw more than approximately 0.75 amps.
  
  NOTE:
  Why perform a Voltage Drop Test? To verify with certainty there is not any resistance in the circuit being tested, perform a simple voltage drop test across the 3156 bulb of the load test tool. To do so perform the following:
6. Connect the leads of a DVOM to the alligator clips on the load test tool while the load test tool is connected in series with the circuit.
7. Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
8. The voltage dropped across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested.
NOTE:
Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery.

Courtesy of CHRYSLER GROUP, LLC

Is the load test bulb illuminated and bright?

Yes
- Go To 3
No
- Repair the 12.0 volt circuit for an open or high resistance. If the fuse is found to be open, check the circuit for a short to ground.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to: 3.6L (GPEC 2A) - POWERTRAIN VERIFICATION TEST or 3.6L (GPEC 5) - POWERTRAIN VERIFICATION TEST .
ISOLATE AND CHECK THE (T524) FRONT LOCKER RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. The ignition must be off when checking the continuity of a circuit.
2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connectors containing the circuit being tested. Note: Use the wiring diagram as a guide to follow the path of the circuit. Check the disconnected connectors and related harnesses for damage, corrosion, and loose fitting terminals.
3. Before testing a circuit, measure the resistance between the two leads of the Digital Volt-Ohm Meter (DVOM). Note: Resistance in the meter leads can cause an error in the test results.
4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
5. Connect the other lead to the circuit being tested at the ECU harness connector and measure the resistance of the circuit.
  NOTE:
  When back-probing a circuit at a harness connector, always use an appropriate back probing tool to prevent damage to the connector terminals.
  
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the circuit for an open or high resistance.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST
CHECK THE DTCM HARNESS CONNECTOR AND TERMINALS
1. Turn the ignition off.
2. Check the DTCM harness connector for proper connection at the Front Differential.
3. Verify that the connector is completely plugged in and locked prior to disconnecting.
4. Disconnect the DTCM harness connector and check for pushed out or spread terminals, brineling on terminals, discoloration from excessive heat, or corrosion and water intrusion.
  Were any issues found with the connector or terminals?
  
  Yes
  - Repair the found issues in accordance with the service information or properly connect and lock the COMPONENT harness connector.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST
  No
  - Go To 5
REPLACE THE FRONT AXLE LOCKER ACTUATOR AND CHECK FOR THE DTC TO RETURN
1. Replace the Front Axle Locker Actuator in accordance with the Service Information. Refer to: Axle Locker Actuator/Motor - REMOVAL AND INSTALLATION .
2. Connect the component and ECU harness connectors.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Using the Environmental Data or When Monitored information above, operate the vehicle under the conditions that set the DTC.
6. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 6
  No
  - Replacing the Front Axle Locker Actuator corrected the condition.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all Drivetrain Control Module (DTCM) harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all DTCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read DTCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the DTCM in accordance with the Service information. Refer to: DRIVETRAIN CONTROL MODULE (DTCM) .
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the DTCM VERIFICATION TEST. Refer to: DTCM VERIFICATION TEST