Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Diagnose all CAN C communication failures before continuing.
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on vehicle work order.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors, pay particular attention the CAN circuits.
  - Perform the EPS Verification Test. Refer to EPS VERIFICATION TEST .
VERIFY ABS MODULE IS ACTIVE ON CAN C BUS
1. Using a scan tool, select ECU View.
2. Verify that the ABS Module is active on the bus.
  Is the ABS Module active on the bus?
  
  Yes
  - Go To 3
  No
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
CHECK FOR ACTIVE OR STORED DTCs IN ABS MODULE
1. Using a scan tool, read ABS Module DTCs.
  Are any DTCs active or stored in the ABS Module?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
  No
  - Go To 4
CHECK FOR ACTIVE OR STORED COMMUNICATION DTCs IN BCM
1. Using a scan tool, read BCM DTCs.
  Are any active of stored ABS Module Communication DTCs set in the BCM?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
  No
  - Go To 5
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect the EPS 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. Connect the EPS Module harness connectors. Be certain that the harness connectors are fully seated and the connector locks are 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.
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 EPS Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Electric Power Steering (EPS) Module in accordance with Service Information. Refer to COLUMN, REMOVAL AND INSTALLATION .
  - Perform the EPS VERIFICATION TEST. Refer to EPS VERIFICATION TEST .
  No
  - Perform the EPS VERIFICATION TEST. Refer to EPS VERIFICATION TEST .
  - Test complete.