Chart 12

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

Warning Indicators:

MIL
TCIL
Temperature Warning Indicator Lamp or Gauge (applications with CHT sensor)
Check Fuel Cap Indicator Lamp

NOTE:

If the symptom is both "MIL on" AND "exhaust emission test failure", GO directly to CHART 11 .
If engine is a no start, GO directly to CHART 3 .
If engine runs rough at idle, GO directly to CHART 1 .

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted
Verify fuel filler cap is properly tightened	Visual
Trucks with Power Takeoff (PTO) and MIL concern: PTO input to PCM	GO to B: Power Take Off STEP FB1.
MIL always on when engine is running (no DTCs): MIL circuits	Crown Victoria, Grand Marquis, Marauder, Explorer Sport Trac, Ranger: GO to B: Malfunction Indicator Lamp STEP NB1. All Others: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article.
TCIL always on when engine is running (no DTCs): TCIL circuits	Focus, Mustang, Town Car, Thunderbird, LS6/LS8, Freestar/Monterey, Expedition, Aviator and Navigator: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. All Others: GO to B: Transmission Control Switch TCS/Transmission Control Indicator Lamp TCIL STEP TB7.
MIL never on (including the bulb check when the engine is first started): MIL circuits	Crown Victoria, Grand Marquis, Marauder, Explorer Sport Trac, Ranger: GO to B: Malfunction Indicator Lamp STEP NB3. All others: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article.
TCIL never on: TCIL circuits	Focus, Mustang, Town Car, Thunderbird, LS6/LS8, Freestar/Monterey, Expedition, Aviator and Navigator: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article. All others: GO to B: Transmission Control Switch TCS/Transmission Control Indicator Lamp TCIL STEP TB9.
Temperature Warning Indicator Lamp or Gauge concerns (applications with CHT sensor only): Engine cooling system or lamp circuits	If engine is overheating: Engine Cooling - Refer to the appropriate ENGINE COOLING article. Be aware that since a PCM DTC was not received, the PCM has not attempted to turn the lamp on. If engine operates at normal temperature: GO to L: Cylinder Head Temperature (CHT) Sensor STEP DL35.
Check Fuel Cap Indicator Lamp Always on or off: Check fuel indicator lamp circuits	Focus (2.0L), Crown Victoria/Grand Marquis/Marauder, Ranger, Explorer Sport Trac, E-Series, and F -150 (4.2L and 4.6L): Indicator Lamp Always On: GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX47. Indicator Lamp Always Off: GO to X: Evaporative Emission (EVAP) Monitor and System STEP HX48. All others: Instrument Cluster - Refer to the appropriate INSTRUMENT CLUSTER article.
Additional Testing	GO to Z: Intermittent STEP Z1.