Chart 12

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Warning Indicators: Check Fuel Cap, Malfunction Indicator Lamp (MIL), Power Take Off (PTO), Temperature Warning Indicator or Gauge (applications with cylinder head temperature [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 (Section 5 Pinpoint Test unless noted)
Verify the fuel filler cap is correctly tightened or the capless fuel tank filler pipe is correctly sealed.	Visual.
Check Fuel Cap Flashes/Inoperative/Stays On	REFER to the appropriate Instrumentation article, Message Center, and Warning Chimes, to diagnose the check fuel message.
MIL Always on when the engine is running (no DTCs present) Never on (including during indicator prove out)	REFER to the appropriate Instrumentation article, Message Center, and Warning Chimes, and CARRY OUT the Inspection and Verification to continue diagnosis.
PTO PTO indicator never/always on PTO not working correctly	GO to PINPOINT TEST FB .
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 to diagnose the engine overheating symptom. 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, GO to PINPOINT TEST DL .
TCIL Always on when the engine is running (no DTCs present) Never on	REFER to the appropriate Automatic Transmission article, External Controls.
Powertrain Malfunction Indicator (Wrench) Never/always on	REFER to the appropriate Instrumentation article, Message Center, and Warning Chimes, to diagnose the wrench indicator is never/always on or to diagnose the POWERTRAIN MALFUNCTION warning is inoperative.
Additional Testing	GO to PINPOINT TEST Z .