Diagnostic Test
- CHECK FOR AN ACTIVE DTC NOTE:
This DTC must be active for the results of this test to be valid.
- Turn the ignition on.
- With the scan tool, read EHPS Module DTCs and record on the repair order.
- Cycle the ignition switch from off to on.
- With the scan tool, read EHPS Module 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 appropriate 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 IF BCM CAN C BUS DTCS ARE PRESENT
- With the scan tool, read BCM DTCs.
Are there any BCM CAN C BUS DTCs present?
Yes
- Perform the appropriate diagnostic procedure. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
No
- Go To 3
- With the scan tool, read BCM DTCs.
- CHECK IF ENGINE DTCS ARE PRESENT
- With the scan tool, read PCM DTCs.
Are there any PCM DTCs present?
Yes
- Perform the appropriate diagnostic procedure. Refer to 3.0L DIESEL - DIAGNOSTIC CODE INDEX , or 3.6L (GPEC 2A) - DIAGNOSTIC CODE INDEX .
No
- Using the schematics as a guide, check the Electro-Hydraulic Power Steering Module pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the Electro-Hydraulic Power Steering (EHPS) Pump in accordance with the Service Information. Refer to MODULE, ELECTRO-HYDRAULIC POWER STEERING (EHPS), REMOVAL AND INSTALLATION .
- Perform the EHPS Verification Test. Refer to STANDARD PROCEDURE - EHPS VERIFICATION TEST .
- With the scan tool, read PCM DTCs.