Diagnostic Flow Chart

WARNING: This page is about a different car, the 2004 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC FLOW CHART

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	Yes	REPAIR all hard diagnostic trouble codes. FOLLOW the pinpoint tests. REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE first, then this article
1. Did you record any diagnostic trouble codes?	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 TRANSMISSION DRIVE CYCLE TEST .
	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 INTRODUCTION - CNG, FLEX-FUEL & GASOLINE then this article, then GO to Step 4.
	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.
	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.
	No	REFER to DIAGNOSIS BY SYMPTOM 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 INTRODUCTION - CNG, FLEX-FUEL & GASOLINE and use the diagnostic tool to diagnose cause of concern in the processor, vehicle harness or external inputs (sensors or switches).
	No	REFER to DIAGNOSIS BY SYMPTOM 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.
	No	Repeat this DIAGNOSTIC FLOW CHART and repair as necessary.