Diagnostic Flow Chart

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC FLOW CHART

WARNING: If equipped with fire suppression system, refer to FIRE SUPPRESSION SYSTEM for Important Safety Warnings. Know and understand the customer concerns Check the fluid level and condition Verify the concern by operating the vehicle Check for non-factory-installed items and verify correct installation Check the shift linkage adjustments Check TSBs for vehicle concerns Carry out quick test both KOER and KOEO Record all codes 1) Did you record any diagnostic trouble codes?	Yes	REPAIR all hard diagnostic trouble codes. FOLLOW the pinpoint tests. Refer to the INTRODUCTION - GASOLINE article first, then the appropriate article.
	No	REFER to DIAGNOSIS BY SYMPTOM , then GO to Step 5.
2) Are any continuous test memory codes present?	Yes	CLEAR codes and CARRY OUT drive cycle test.
2) Are any continuous test memory codes present?	NO	GO to Step 4.
3) Did the continuous test memory codes reappear?	Yes	REPAIR all continuous test memory codes. FOLLOW the pinpoint tests. Refer to the INTRODUCTION - GASOLINE article then the appropriate article, then GO to Step 4.
3) Did the continuous test memory codes reappear?	No	GO to Step 4.
4) Is the concern repaired?	Yes	CARRY OUT the final quick test to verify that no diagnostic trouble codes are present. CLEAR memory codes.
4) Is the concern repaired?	No	REFER to DIAGNOSIS BY SYMPTOM .
5) Are there any electrical concerns?	Yes	INSTALL the diagnostic tool and CARRY OUT the output state control test, then GO to Step 6.
5) Are there any electrical concerns?	No	REFER to the hydraulic and mechanical routine to diagnose and REPAIR the concern, then GO to Step 7.
6) Was the transmission concern corrected when the diagnostic tool was installed?	Yes	REFER to the INTRODUCTION - GASOLINE article, intermittent fault diagnosis section and use the diagnostic tool to diagnose cause of concern in the processor, vehicle harness or external inputs (sensors or switches).
	No	REFER to the hydraulic and mechanical routine to diagnose the concern, then GO to Step 7.
7) Is the concern repaired?	Yes	CARRY OUT the final quick test to verify that no diagnostic trouble codes are present. CLEAR memory codes.
7) Is the concern repaired?	No	No further testing is available, retest as necessary.