Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read and record DTCs on the repair order.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase ABS DTCs.
5. Cycle the ignition switch from off to on.
6. 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 CONNECTOR/TERMINAL FOR DAMAGE
NOTE:
Check all terminals for broken, bent, pushed out, or corroded terminals.
1. Turn the ignition off.
2. Inspect the Brake Pedal Travel Sensor for proper mounting.
3. Inspect the Brake Pedal Travel Sensor harness and connector.
4. Inspect the Anti-lock Brake System (ABS) Module harness and connector.
  Were any problems found?
  
  Yes
  - Repair as necessary in accordance with the Service Information.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 3
(B937) PEDAL TRAVEL SENSOR RETURN CIRCUIT SHORTED TO VOLTAGE
1. Disconnect the ABS Module harness connector.
2. Disconnect the Brake Pedal Travel Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage between the (B937) Pedal Travel Sensor Return circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (B937) Pedal Travel Sensor Return circuit for a short to voltage.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 4
(B237) PEDAL TRAVEL SENSOR FEED CIRCUIT SHORTED TO VOLTAGE
1. Measure the voltage between the (B237) Pedal Travel Sensor Feed circuit and ground.
  Is there any voltage present?
  
  Yes
  - Repair the (B237) Pedal Travel Sensor Feed circuit for a short to voltage.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 5
(B237) PEDAL TRAVEL SENSOR FEED CIRCUIT SHORTED TO GROUND
1. Turn the ignition off.
2. Measure the resistance between the (B237) Pedal Travel Sensor Feed circuit and ground.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (B237) Pedal Travel Sensor Feed circuit for a short to ground.
  - Perform the ABS VERIFICATION. Refer to ABS VERIFICATION .
  No
  - Go To 6
BRAKE PEDAL POSITION (BPP) SENSOR
1. Turn the ignition off.
2. Connect the ABS Module harness connector.
3. Turn the ignition on.
4. Measure the voltage at the BPP Sensor harness connector between the (B237) BPP Sensor Feed and the BPP Sensor Return.
  Is the voltage above 4.8 volts?
  
  Yes
  - Replace the Brake Pedal Position (BPP) Sensor in accordance with the Service Information. Refer to SENSOR, STOP LAMP, REMOVAL AND INSTALLATION .
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  No
  - Go To 7
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
  - Perform ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
  - Test complete.