Diagnostic Test

CHARGING SYSTEM DTCS PRESENT
CAUTION:
Do NOT disconnect the Torque Sensor (Grey) harness connector on the electric power steering gear, as permanent damage can occur to the Electric Power Steering (EPS) Module.
1. Turn the ignition on.
2. With the scan tool, read DTCs in the PCM.
  Is there any Charging System or related voltage DTCs present?
  
  Yes
  - Perform the appropriate diagnostic procedure. Refer to DTC INDEX .
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
NOTE:
Make sure the battery is fully charged.
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on vehicle work order.
3. With the scan tool, erase DTCs.
4. Start the engine.
5. With the scan tool, read the DTCs while turning the steering wheel from stop to stop.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.
(A951) B(+) CIRCUIT OPEN OR HIGH RESISTANCE
1. Turn ignition off.
2. Disconnect the EPS Module C1 harness connector.
3. Turn the ignition on.
  NOTE:
  Wiggle test the wiring harness and electrical connectors while testing the circuit.
  
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
4. With a 12-volt test light connected to ground, check the (A951) Fused B+ circuit at the EPS C1 harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (A951) Fused B+ circuit for an open or high resistance.
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(Z906) GROUND CIRCUIT OPEN OR HIGH RESISTANCE
1. Turn ignition off.
  NOTE:
  Wiggle test the wiring harness and electrical connectors while testing the circuit.
2. With a test light connected to B+ check (Z906) Ground circuit at the EPS Module C1 harness connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the (Z906) Ground circuit for an open or high resistance.
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK RELATED HARNESS CONNECTIONS
NOTE:
Do not disconnect the Torque Sensor (Grey) harness connector and make sure it is connected properly.
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 MODULE, ELECTRIC POWER STEERING (EPSM) .
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  - Test complete.