Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
This DTC must be active for the results of this test to be valid.
1. Turn the ignition on.
2. With the scan tool, read ABS DTCs and record on the repair order.
3. With the scan tool, read and record Freeze Frame information.
4. With the scan tool, erase DTCs.
5. Start the engine.
6. Press the brake pedal firmly and release.
7. With the scan tool, read ABS DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the ABS INTERMITTENT CONDITION TEST. Refer to ABS INTERMITTENT CONDITION .
MECHANICAL BRAKE SYSTEM INSPECTION
1. Turn the ignition off.
2. Check the brake fluid for contaminants.
3. Visually inspect all the brake lines for bent, damaged, or pinched restrictions.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 3
PERFORM THE ABS INITIALIZATION ROUTINE
1. Park the vehicle on level ground.
2. Turn the ignition on.
3. With the scan tool, under "Miscellaneous Functions" perform the ABS Initialization routine.
  Was the ABS Initialization routine successful?
  
  Yes
  - Test complete.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Perform the ABS Initialization routine again, if still unsuccessful.
  - Go To 4
BRAKE PEDAL INSPECTION
1. Turn the ignition off.
2. Check the brake pedal for damage or restrictions not allowing it to fully return.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 5
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
  
  NOTE:
  For this failure it is necessary to replace both the Anti-lock Brake System (ABS) Module and the Hydraulic Control Unit (HCU) as a complete unit. This is known as the Integrated Control Unit (ICU).
  - 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 the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  - Test complete.