Chart 12

Warning Indicators: Check Fuel Cap Indicator, Malfunction Indicator Lamp (MIL), Power Take Off (PTO), Temperature Warning Indicator or Gauge (applications with CHT sensor only), Transmission Control Indicator Lamp (TCIL), Powertrain Malfunction Indicator (Wrench)
PTO Concerns: Not Working Correctly

NOTE:

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

SYSTEM/COMPONENT	REFERENCE (Pinpoint Test unless noted)
Verify the fuel filler cap is properly tightened.	Visual
Check Fuel Cap Indicator Never/always on	REFER to the appropriate INSTRUMENT CLUSTER article or appropriate INFORMATION AND MESSAGE CENTER article.
MIL Always on when the engine is running (no DTCs present) Never on (including during indicator prove out)	REFER to the appropriate INSTRUMENT CLUSTER article .
PTO PTO indicator never/always on PTO not working correctly	refer to PINPOINT TEST FB - Power Take Off (PTO) .
Temperature Warning Indicator or Gauge (applications with CHT sensor only) Engine cooling system Indicator circuits	For an engine that is overheating, REFER to the appropriate ENGINE COOLING article. Be aware that since a PCM DTC is not present, the PCM is not attempting to activate the indicator. For an engine operating at normal temperature, refer to PINPOINT TEST DL - Cylinder Head Temperature (CHT) Sensor .
TCIL Always on when the engine is running (no DTCs present) Never on	For E-Series, refer to PINPOINT TEST TB - Transmission Control Switch (TCS)/ Transmission Control Indicator Lamp (TCIL) . For all others, REFER to the appropriate INSTRUMENT CLUSTER article.
Powertrain Malfunction Indicator (Wrench) Never/always on	REFER to the appropriate INSTRUMENT CLUSTER article.
Additional Testing	refer to PINPOINT TEST Z - Intermittent .