Ford Mustang (1999-2004) Service Manual: Inspection and Verification

1. Verify the customer concern.

2. Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:

• check that the program card is correctly installed.
• check the connections to the vehicle.
• check the ignition switch position.

5. If the diagnostic tool still does not power up, refer to the diagnostic tool operating manual.

6. Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with:

• CKT914, CKT915 OR CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section.
• NO RESP/NOT EQUIP for the instrument cluster, Go To Pinpoint Test A or for the generic electronic module (GEM), Go To Pinpoint Test W .
• SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the self-test diagnostics for the instrument cluster or the GEM.

7. If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Index or the GEM Diagnostic Trouble Code Index to continue diagnostics.

8. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.