Chart 12

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.