Symptom Chart

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

PROBLEM SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the instrument cluster	Circuitry Controller area network (CAN) circuits Instrument cluster	GO to PINPOINT TEST A .
Incorrect fuel gauge indication - without flex-fuel	Circuitry Fuel tank Instrument cluster Fuel sender	GO to PINPOINT TEST B .
Incorrect fuel gauge indication - with flex-fuel	Circuitry Fuel tank Instrument cluster Flex-fuel sensor module	GO to PINPOINT TEST C .
Incorrect temperature gauge indication	Circuitry Engine coolant temperature (ECT) sender Instrument cluster Powertrain control module (PCM)	GO to PINPOINT TEST D .
The low oil pressure warning indicator is never/always on	Circuitry Engine oil pressure switch Instrument cluster	GO to PINPOINT TEST E .
The speedometer/odometer is inoperative	Powertrain control module (PCM) Circuitry Instrument cluster	GO to PINPOINT TEST F .
The tachometer is inoperative	Circuitry Instrument cluster Powertrain control module (PCM)	GO to PINPOINT TEST G .
The low fuel warning indicator is never/always on	Instrument cluster Flex-fuel sensor module (if equipped)	GO to PINPOINT TEST H .
The charging system warning indicator is never on	Circuitry Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST I .
The charging system warning indicator is always on	Circuitry Generator Powertrain control module (PCM) Instrument cluster	REFER to CHARGING SYSTEM - GENERAL INFORMATION .
The brake warning indicator is never on	Circuitry Parking brake switch Brake fluid level switch Instrument cluster	GO to PINPOINT TEST J .
The brake warning indicator is always on	Circuitry Parking brake switch Brake fluid level switch Instrument cluster	GO to PINPOINT TEST K .
The malfunction indicator lamp (MIL) is always on	Circuitry Powertrain control module (PCM) Instrument cluster	See INTRODUCTION - GASOLINE .
The malfunction indicator lamp (MIL) is never on	Circuitry Instrument cluster Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST L .
The safety belt warning indicator does not operate correctly	Circuitry Safety belt buckle switch Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST M .
The air bag warning indicator is never/always on	Circuitry Instrument cluster Restraint control module (RCM)	GO to PINPOINT TEST N .
The LH turn indicator is never on	Circuitry Instrument cluster	GO to PINPOINT TEST O .
The RH turn indicator is never on	Circuitry Instrument cluster	GO to PINPOINT TEST P .
The high beam indicator is never on	Circuitry Instrument cluster	GO to PINPOINT TEST Q .
The traction control indicator is never/always on (if equipped)	Anti-lock brake system (ABS) module Instrument cluster Circuitry	GO to PINPOINT TEST R .
The anti-lock brake system (ABS) warning indicator is always on	Circuitry Instrument cluster ABS module	REFER to ANTI-LOCK CONTROL .
The anti-lock brake system (ABS) warning indicator is never on	Circuitry ABS module Instrument cluster	GO to PINPOINT TEST S .
The cruise control indicator is never/always on	Circuitry Speed control servo Instrument cluster	GO to PINPOINT TEST T .
The check fuel cap warning indicator is never/always on	Circuitry Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST U .
The theft warning indicator is never/always on	Circuitry Instrument cluster Powertrain control module (PCM)	GO to PINPOINT TEST V .
The instrument cluster is inoperative	Circuitry Instrument cluster	GO to PINPOINT TEST W .