Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
This DTC must be active for the results of this test to be valid.
1. Perform any Service Bulletins that may apply.
2. Turn the ignition on.
3. With the scan tool, read ABS DTCs and record on the repair order.
4. With the scan tool, read and record Freeze Frame information.
5. With the scan tool, erase DTCs.
6. Start the engine.
7. Press the brake pedal firmly and release.
8. 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 .
CHECK FOR LEAKS ON BRAKE FLUID PIPE
1. Check for brake fluid leaks in braking system.
  Are there any leaks?
  
  Yes
  - Repair the leaks as necessary and restore correct brake fluid level.
  No
  - Go to Step 3.
CHECK BRAKE PADS
1. Check wear of brake pads.
  Brake pads worn
  
  Yes
  - Replace brake pads and restore correct brake fluid level.
  No
  - Go to Step 4.
CHECK ABS CONTROL UNIT SUPPLY
1. Check that the power supply for the ABS control unit is correct.
  Is the power supply correct?
  
  Yes
  - Go to Step 5.
  No
  - Restore correct power supply
CHECK CONNECTIONS BETWEEN BRAKE FLUID LEVEL SENSOR AND ABS CONTROL UNIT
1. Check for loose, damaged or corroded connections on the brake fluid level sensor or the ABS control unit.
  Are there any loose or damaged connections?
  
  Yes
  - Repair the wiring connections as necessary.
  No
  - Go to Step 6.
CHECK WIRING BETWEEN BRAKE FLUID LEVEL SENSOR AND ABS CONTROL UNIT
1. Check the wiring for an open circuit or high resistance between the brake fluid level sensor and PINS 31 and 34 of connector A on the ABS control unit.
  Is there a high resistance or open condition in the wiring?
  
  Yes
  - Repair the open circuit or high resistance in the wiring.
  No
  - Go to Step 7.
CHECK WIRING BETWEEN BRAKE FLUID LEVEL SENSOR AND ABS CONTROL UNIT
1. Check the wiring for a short circuit between the brake fluid level sensor and PINS 31 and 34 of connector A on the ABS control unit.
  Is there a short circuit in the wiring?
  
  Yes
  - Repair the short circuit in the wiring.
  No
  - Go To 8
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 AND INSTALLATION .
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .