Symptom Chart

WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
No communication with the instrument cluster	Fuse(s) Circuitry Instrument cluster	GO to PINPOINT TEST A .
Incorrect fuel gauge indication	Circuitry Fuel pump module assembly Fuel level sensor Fuel tank Instrument cluster	GO to PINPOINT TEST B .
Incorrect temperature gauge indication	Instrument cluster	GO to PINPOINT TEST C .
The tachometer is inoperative	Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST D .
The speedometer/odometer is inoperative	Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST E .
The low fuel warning indicator is never/always on (if equipped)	Fuel tank Fuel pump gauge sender Instrument cluster	GO to PINPOINT TEST F .
The safety belt warning indicator is never/always on	Restraint control module (RCM) Instrument cluster	GO to PINPOINT TEST G .
The check fuel cap warning indicator is never/always on	Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST H .
The brake warning indicator is never on	Circuitry Parking brake warning indicator switch Brake fluid level switch (part of the brake fluid reservoir) Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST I .
The brake warning indicator is always on	Circuitry Parking brake warning indicator switch Brake fluid level switch (part of the brake fluid reservoir) Base brake system SJB Instrument cluster	GO to PINPOINT TEST X .
The charging system warning indicator is never/always on	Charging system Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST J .
The high beam indicator is never/always on	Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST K .
The LH turn signal indicator is never/always on	Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST L .
The RH turn signal indicator is never/always on	Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST M .
The anti-lock brake system (ABS) warning indicator is never/always on	ABS module Instrument cluster	GO to PINPOINT TEST N .
The low oil pressure warning indicator is never/always on	Circuitry Oil pressure switch Base engine concern Smart junction box (SJB) Instrument cluster	GO to PINPOINT TEST O .
The malfunction indicator lamp (MIL) is never/always on	Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST P .
The air bag warning indicator is never/always on	Restraint control module (RCM) Instrument cluster	GO to PINPOINT TEST Q .
The speed control indicator is never/always on	Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST R .
The powertrain malfunction (wrench) warning indicator is never/always on	Transmission control module (TCM) Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST S .
The door ajar warning indicator is never/always on	Interior lamps Smart junction box (SJB) Instrument cluster.	GO to PINPOINT TEST T .
The traction assist indicator is never/always on	Traction assist system Powertrain control module (PCM) Instrument cluster	GO to PINPOINT TEST U .
The passive anti-theft system (PATS) indicator is always on or is flashing rapidly	Circuitry PATS key PATS transceiver Powertrain control module (PCM) Instrument cluster	REFER to ANTI-THEFT - PATS to continue diagnosis of the PATS.
The passive anti-theft system (PATS) indicator is never on (does not prove-out)	Instrument cluster	INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
The instrument cluster is inoperative	Fuse(s) Circuitry Instrument cluster	GO to PINPOINT TEST V .