Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
INSPECT THE ACTIVE GRILL SHUTTER ASSEMBLY FOR SIGNS OF PHYSICAL DAMAGE
1. Turn the ignition off.
2. Inspect the Active Grill Shutter Assembly and connector for damage due to road debris.
3. Confirm that the AGS harness connector is connected properly.
  Is the Active Grill Shutter Assembly or connector damaged or disconnected?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 2.4L .
  No
  - Go To 3

CHECK THE (Z906) GROUND CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT

NOTE:

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 testing a circuit. Refer to CIRCUIT VOLTAGE DROP AND LOAD TESTING PROCEDURES .

Turn the ignition off.
Disconnect the Active Grill Shutter harness connector.
CAUTION:
Do not load test any circuits with components still connected to the circuit.

Load test the (Z906) Ground circuit at the Active Grill Shutter harness connector (A). Note: refer to the diagram below.

Courtesy of CHRYSLER GROUP, LLC

NOTE:

The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuitry. Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery.

Is the load test bulb illuminated and bright?

Yes

Go To 4

Repair the (Z906) Ground circuit for an open or high resistance.
Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 2.4L .

CHECK THE ACTIVE GRILL SHUTTER (A940) FUSED B+ CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT

CAUTION:

Do not load test any circuits with components still connected to the circuit.

Turn the ignition on.

Load test the Active Grill Shutter (A940) Fused B+ circuit at the Active Grill Shutter harness connector (A). Note: refer to the diagram below.

Courtesy of CHRYSLER GROUP, LLC

NOTE:

Is the load test bulb illuminated and bright?

Yes

Go To 5

Repair the Active Grill Shutter (A940) Fused B+ 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 POWERTRAIN VERIFICATION TEST, 2.4L .

INSPECT THE ACTIVE GRILL SHUTTER ACTUATOR WIRING AND CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Active Grill Shutter Actuator and the Powertrain Control Module (PCM).
  NOTE:
  When inspecting wiring and connectors be sure to include inspection of midline connectors in the circuit.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for any loose, or partially broken ground wires.
4. Check for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Active Grill Shutter Actuator and Powertrain Control Module connectors.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 2.4L .
  No
  - Go To 6
REPLACE THE ACTIVE GRILL SHUTTER ACTUATOR AND RETEST FOR DTC
1. Replace the Active Grill Shutter Actuator in accordance with the Service Information. Refer to GRILLE, ACTIVE SHUTTER, REMOVAL .
2. Reconnect the PCM harness connectors.
3. Turn the ignition on.
4. With the scan tool erase DTCs. Navigate to Miscellaneous functions and perform the 'Active Grille Shutter Replaced' procedure.
5. Start the engine.
6. With the scan tool read DTCs
  Did the DTC return?
  
  Yes
  - Go To 7
  No
  - Replacing the Active Grill Shutter Actuator repaired the fault.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 2.4L .
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. 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.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL, 2.4L/3.2L .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 2.4L .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 2.4L .