Diagnostic Test

VERIFY THE DTC IS ACTIVE
1. Perform any Service Bulletins that may apply.
2. Turn the Ignition on.
3. With the scan tool, read and record the ABS DTCs on the repair order.
4. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
5. With the scan tool, erase ABS DTCs.
6. Park the vehicle on level ground.
7. Cycle the ignition from off to on.
8. With the scan tool, read the ABS DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the ABS-INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION .
PERFORM THE ABS VALVE CALIBRATION ROUTINE
1. With the scan tool, under "Miscellaneous Functions" perform the ABS Valve Calibration routine.
2. With the scan tool, erase the DTCs.
3. Cycle the ignition from off to on.
4. With the scan tool, read the DTCs.
  Does the DTC remain active?
  
  Yes
  - Perform the "ABS Valve Calibration" routine again, if still unsuccessful.
  - Go To 3
  No
  - Test Complete.
CHECK RELATED HARNESS CONNECTIONS
1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
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. Connect the ABS Module harness connector. Be certain that the harness connector is fully seated and the connector lock is fully engaged.
7. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Connect the related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. Turn the ignition on.
10. With the scan tool, erase DTCs.
11. Cycle the ignition from off to on.
12. With the scan tool, read ABS Module DTCs.
  Did the DTC return?
  
  Yes
  
  NOTE:
  For this failure it is necessary to replace both the ABS Module and the HCU as a complete unit.
  - Replace the Integrated Control Unit (ICU) in accordance with the Service Information. Refer to INTEGRATED CONTROL UNIT (ICU), REMOVAL AND INSTALLATION .
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  - Test complete.