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.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
NOTE:
This DTC can be caused by a sudden, externally induced acceleration or deceleration, such as driving in sand or from an accident.

NOTE:
To help in the service of the ACC system, it is recommended to communicate with the customer to obtain the environmental conditions they were driving in when the cruise control concern took place. Heavy rain, snow, ice, and fog can cause the ACC system to become inoperative. This is considered as a normal operational reaction of the ACC system and no repair is necessary.
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10 seconds.
5. Turn the ignition on.
6. Using the recorded Environmental Data and the When Monitored Conditions, 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. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR DTCS IN OTHER MODULES - ESPECIALLY ABS, PCM AND TCM
1. Refer to the saved DTC information recorded on the repair order.
  Are any other modules reporting DTCs?
  
  Yes
  - Refer to the appropriate diagnostic procedure(s) and repair as necessary. Refer to DTC INDEX .
  No
  - Go To 3
CHECK BRAKE SYSTEM OPERATION
1. Check the functionality of the brake system. Refer to DIAGNOSIS AND TESTING - BASE BRAKE SYSTEM .
  Were any problems found?
  
  Yes
  - Repair as necessary.
  No
  - Go To 4
CHECK FOR APPLICABLE SERVICE BULLETINS
1. With a scan tool, check all electronic control Modules for software updates that are related to the customer concern.
2. Check for any Service Bulletins that could be related to the customer concern.
  Were any software updates or service bulletins applicable to the customer concern?
  
  Yes
  - Perform the service procedure as necessary.
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK FOR IMPROPERLY INSTALLED AFTERMARKET ACCESSORIES
1. Check aftermarket accessories for proper installation.
  Were any problems found?
  
  Yes
  - Repair any conditions that are found.
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 6
CHECK COMPONENTS FOR COLLISION RELATED DAMAGE
1. Check related components and wire harnesses for collision related damage.
  Were any problems found?
  
  Yes
  - Repair any conditions that are found.
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 7
CHECK RELATED HARNESS CONNECTIONS
NOTE:
This DTC can be caused by a sudden, externally induced acceleration or deceleration, such as driving in sand or from an accident.

NOTE:
To help in the service of the ACC system, it is recommended to communicate with the customer to obtain the environmental conditions they were driving in when the cruise control concern took place. Heavy rain, snow, ice, and fog can cause the ACC system to become inoperative. This is considered as a normal operational reaction of the ACC system and no repair is necessary.
1. Turn the ignition off.
2. Disconnect all ACC 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.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all ACC 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. Turn the ignition off for a minimum of 10 seconds.
11. Turn the ignition on.
12. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
13. With the scan tool, read ACC DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Adaptive Cruise Control (ACC) Module in accordance with the Service Information. Refer to MODULE, ADAPTIVE CRUISE CONTROL (ACCM), REMOVAL .
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repairing the wiring or the connectors corrected the condition.
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to STANDARD PROCEDURE .