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 DTCs and record on the repair order.
4. With the scan tool, read and record Environmental Data.
5. With the scan tool, erase EHPS DTCs.
1. Park the vehicle on level ground.
2. Start the engine.
3. Tun the steering wheel from stop to stop.
4. With the scan tool, read EHPS DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
CHECK FOR ELECTRO-HYDRAULIC POWER STEERING (EHPS) MODULE OR COMMUNICATION RELATED DTCS
1. Refer to the recorded DTCs.
  Are there any EHPS Module or Communication related DTCs active?
  
  Yes
  - Perform the appropriate diagnostic procedures before continuing with this test. Refer to DTC INDEX (1 OF 2) and/or DTC INDEX (2 OF 2) .
  No
  - Go To 3
EHPS PUMP MOTOR
1. Turn the steering wheel left and right.
  Is there power steering assist?
  
  Yes
  - Go To 4
  No
  - Replace the Electro-Hydraulic Power Steering (EHPS) Pump in accordance with the Service Information. Refer to PUMP, REMOVAL AND INSTALLATION .
  - Perform the EHPS VERIFICATION TEST. Refer to EHPS VERIFICATION TEST .
POWER STEERING SYSTEM
1. Inspect the Power Steering System for mechanical problems.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the EHPS VERIFICATION TEST. Refer to EHPS VERIFICATION TEST .
  No
  - Go To 5
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect the EHPS 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 EHPS 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 EHPS Module DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Electro-Hydraulic Power Steering (EHPS) Module in accordance with the Service Information. Refer to MODULE, ELECTRO-HYDRAULIC POWER STEERING (EHPS), REMOVAL AND INSTALLATION .
  - Perform the EHPS VERIFICATION TEST. Refer to EHPS VERIFICATION TEST .
  No
  - Perform the EHPS VERIFICATION TEST. Refer to EHPS VERIFICATION TEST .
  - Test complete.