Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Perform any Service Bulletins that may apply.
2. Turn the ignition off.
3. With the scan tool, read ABS DTCs and record on the repair order.
4. With the scan tool, read and record the Environmental Data to help identify the conditions in which the DTC was set.
5. With the scan tool, erase ABS DTCs.
  WARNING:
  To avoid possible serious or fatal injury, check brake capability is available before road testing.
6. Road test the vehicle over 40 km/h (25 mph).
7. With the scan tool, read ABS DTCs.
  Did the DTC return?
  
  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 WHEEL SPEED SENSOR (WSS) CIRCUIT RELATED DTCS
1. Refer to the recorded DTCs.
  Are there any WSS circuit related DTCs active?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to DTC INDEX (1 OF 2) and/or DTC INDEX (2 OF 2) .
  No
  - Go To 3
CHECK FOR IMPROPER LEFT REAR TIRE PRESSURE/MISMATCHED TIRES
1. Turn the ignition off.
2. Check and adjust the Left Rear Tire pressure.
3. Check and adjust all other tire pressures.
4. Inspect for mismatched tires on vehicle.
  Is the Left Rear Tire improperly inflated or mismatched tires on vehicle?
  
  Yes
  - Repair as necessary
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 4
CHECK THE LEFT REAR WSS FOR LOOSENESS, INSPECT CIRCUITS/CONNECTORS/TERMINALS FOR DAMAGE
NOTE:
Check all terminals for broken, bent, pushed out, or corroded terminals.
1. Turn the ignition off.
2. Inspect the ABS Module harness connector and the Left Rear WSS harness connector.
3. Check the WSS for looseness, excessive corrosion and not properly fastened.
4. Inspect the Left Rear WSS circuits between the Left Rear WSS and the Anti-lock Brake System (ABS) Module for damage.
  Is the Left Rear WSS loose or any of the wiring/connectors/terminals damaged?
  
  Yes
  - Repair as necessary.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 5
CHECK THE LEFT REAR WHEEL SPEED SENSOR (WSS) FOR DAMAGE
1. Remove the Left Rear Wheel Speed Sensor.
2. Inspect the Wheel Speed Sensor for proper mounting.
3. Inspect the Wheel Speed Sensor harness and connector.
4. Inspect the Wheel Speed Sensor for excessive debris on the sensor.
  Is the Left Rear Wheel Speed Sensor (WSS) damaged?
  
  Yes
  - Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, REAR, REMOVAL AND INSTALLATION .
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 6
CHECK THE LEFT REAR AXLE SHAFT/TONE WHEEL FOR DAMAGE
NOTE:
The Tone Wheel is external and is part of the Axle Shaft.

NOTE:
Tone Wheel teeth should be perfectly square
1. Check the Tone Wheel for missing, nicked, bent, cracked teeth.
2. Check the axle shaft fastener for looseness, and not properly fastened. Tighten fastener to proper specification as required.
  NOTE:
  Refer to the appropriate service information, if necessary, for procedures or specifications.
  
  Were there any problems found with the Axle Shaft/Tone Wheel?
  
  Yes
  - Replace the Left Rear Axle Shaft/Tone Wheel.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 7
REPLACE THE LEFT REAR WHEEL SPEED SENSOR (WSS) AND TEST FOR DTCS
1. Replace the Left Front Wheel Speed Sensor (WSS) in accordance with the Service Information. Refer to SENSOR, WHEEL SPEED, REAR, REMOVAL AND INSTALLATION .
2. Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  WARNING:
  To avoid possible serious or fatal injury, check brake capability is available before road testing.
3. Road test the vehicle over 40 km/h (25 mph).
  NOTE:
  Vehicle must be driven for several minutes above 40 km/h (25 mph) for set conditions to be met.
4. With the scan tool, read ABS DTCs.
  Did the DTC return?
  
  Yes
  - Go To 8
  No
  - Test Complete.
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 ABS 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
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  - Test complete.