Diagnostic Test

CHECK ANTILOCK BRAKE SYSTEM (ABS) MODULE FOR DTCS
1. With the scan tool, read ABS Module DTCs.
  Are any ABS Module Controller Area Network (CAN) or Vehicle Speed related DTCs set?
  
  Yes
  - Repair ABS Module DTCs. Refer to the ANTILOCK BRAKE SYSTEM (ABS) - DIAGNOSTIC CODE INDEX .
  - Perform the ESL VERIFICATION TEST. Refer to STANDARD PROCEDURES .
  No
  - Go To 2
CHECK BODY CONTROL MODULE (BCM) FOR CAN DTCS
1. With the scan tool, read BCM DTCs.
  Are any BCM CAN DTCs set?
  
  Yes
  - Repair BCM CAN DTCs. Refer to the BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
  - Perform the ESL VERIFICATION TEST. Refer to STANDARD PROCEDURES .
  No
  - Go To 3
CHECK FOR AN ACTIVE DTC
1. With the scan tool, read ESL DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read ESL DTCs.
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Go To 7
CHECK VEHICLE SPEED SIGNAL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the ESL Module harness connector.
3. Disconnect the ABS Module harness connector.
4. Measure the resistance of the Vehicle Speed Signal circuit between the ESL Module harness connector and the ABS Module harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the Vehicle Speed Signal circuit for an open or high resistance.
  - Perform the ESL VERIFICATION TEST. Refer to STANDARD PROCEDURES .
CHECK VEHICLE SPEED SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the Vehicle Speed Signal circuit at the ABS harness connector.
  Is there continuity between ground and the Vehicle Speed Signal circuit?
  
  Yes
  - Repair the Vehicle Speed Signal circuit for a short to ground.
  - Perform the ESL VERIFICATION TEST. Refer to STANDARD PROCEDURES .
  No
  - Go To 6
CHECK VEHICLE SPEED SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Check for continuity between the Vehicle Speed Signal circuit and all other circuits at the ABS harness connector.
  Is there continuity between the Vehicle Speed Signal circuit and any other circuit?
  
  Yes
  - Repair the Vehicle Speed Signal circuit for a short to another circuit.
  - Perform the ESL VERIFICATION TEST. Refer to STANDARD PROCEDURES .
  No
  - Go To 8
CHECK WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. Check for any Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the ESL VERIFICATION TEST. Refer to STANDARD PROCEDURES .
  No
  - Test complete.
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all ABS Module harness connectors.
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. Reconnect all ABS Module harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all 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.
9. Using the recorded 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 ESL DTCs.
  Did the DTC return?
  
  Yes
  - Replace the ABS Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL AND INSTALLATION .
  - Perform the ABS MODULE VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Perform the ESL VERIFICATION TEST. Refer to STANDARD PROCEDURES .
  - Test complete.