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. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. With the scan tool, read DTCs and record on the repair order.
4. With the scan tool, erase ABS DTCs.
5. Cycle the ignition switch from off to on and start the vehicle.
6. With the scan tool, read ABS DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
  - Perform the ABS-INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION .
CHECK FOR PCM RELATED DTCS
1. Refer to the recorded DTCs.
  Are there any PCM DTCs active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure(s). For 2.4L, refer to 2.4L - DIAGNOSTIC CODE INDEX . For 3.2L, refer to 3.2L - DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK FOR ABS VACUUM RELATED DTCS
1. Refer to the recorded DTCs.
  Are there any ABS Vacuum Related DTCs active?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to DIAGNOSIS AND TESTING .
  No
  - Go To 4
INSPECT RELATED WIRING HARNESS, TERMINALS, AND CONNECTORS
1. Review the scan tool Environmental Data (EV Data). If possible, try to duplicate the conditions under which the DTC set.
2. Turn the ignition off.
3. Visually inspect the related wire harness. Disconnect all the related harness connectors. Look for any chafed, pierced, pinched, partially broken wires and broken, bent, pushed out, or corroded terminals.
4. Wiggle the wires while checking for shorts and open circuits.
5. Inspect and clean all ABS, engine, and chassis grounds that are related to the most current DTC.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 5
VACUUM PRESSURE SENSOR
1. Turn the ignition off.
2. Replace the Vacuum Pressure Sensor.
3. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
4. With the scan tool, read the DTCs.
  Is the DTC still active?
  
  Yes
  - Go To 6
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect the ABS Module harness connector.
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. Connect the ABS Module harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect the 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.
  WARNING:
  To avoid possible serious or fatal injury, check brake capability is available before road testing.
9. Using the recorded Event and 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 ABS Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM (ABS), REMOVAL .
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  - Test complete.