Diagnostic Procedure Overview

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Qualifying the symptom by the particular sensation present can help narrow down the cause. Always use the "symptom" to "system" to "component" to "cause" diagnosis technique. This diagnostic method divides the problem into related areas to correct the customer concern.

Verify the "symptom".
Determine which "system(s)" can cause the "symptom" using the diagnostic tools described in this service information.
After determining the possible "system(s)", refer to the appropriate information to identify the worn or damaged "components".
After identifying the "components", identify the "cause" of the failure.