Reading and Clearing Diagnostic Trouble Codes

NOTE: Ford DOES NOT provide procedures to perform these diagnostics without the New Generation STAR (NGS) tester.

1. Verify the customer concern by operating the A4WD.

Visual Inspection Chart:

2. Visually inspect for obvious signs of mechanical and electrical damage; refer to the above chart.
3. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:
- check that the program card is properly installed.
- check battery voltage.
- check the connections to the vehicle.
- check the ignition switch position.
4. If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
5. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
- CKT914, CKT915 or CKT70 ALL ECUS NO RESP/NOT EQUIP, refer to Module Communication Network (Information Bus) under Powertrain Management for diagnosis.
- NO RESP/NOT EQUIP for Generic Electronic Module (GEM), go to Pinpoint Test D.
- SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the GEM.
6. If the DTCs retrieved are related to the concern, go to the GEM/CTM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart-A4WD to continue diagnostics.