Engine Symptom Troubleshooting [LF, L3]

Confirm trouble symptom using the following diagnostic index, then go to appropriate troubleshooting chart.

DIAGNOSTIC INDEX

No.	TROUBLESHOOTING ITEM		DESCRIPTION	PAGE
1	Melting of main or other fuses		-	(See NO.1 MELTING OF MAIN OR OTHER FUSES [LF, L3] ).
2	MIL illuminates		The MIL is illuminated incorrectly.	(See NO.2 MIL ILLUMINATES [LF, L3] ).
3	Will not crank		The starter does not work.	(See NO.3 WILL NOT CRANK [LF, L3] ).
4	Hard to start/long crank/erratic start/erratic crank		The starter cranks the engine at normal speed but the engine requires excessive cranking time before starting.	(See NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [LF, L3] ).
5	Engine stalls.	After start/at idle	The engine stops unexpectedly at idle and/or after start or both.	(See NO.5 ENGINE STALLS-AFTER START/AT IDLE [LF, L3] ).
6	Cranks normally but will not start		The starter cranks engine at normal speed but the engine will not run.	(See NO.6 CRANKS NORMALLY BUT WILL NOT START [LF, L3] ).
7	Slow return to idle		The engine takes more time than normal to return to idle speed.	(See NO.7 SLOW RETURN TO IDLE [LF, L3] ).
8	Engine runs rough/rolling idle		The engine speed fluctuates between the specified idle speed and lower speed and the engine shakes excessively.	(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [LF, L3] ).
9	Fast idle/runs on		The engine speed continues at fast idle after warm-up. The engine runs after the ignition switch is turned off.	(See NO.9 FAST IDLE/RUNS ON [LF, L3] ).
10	Low idle/stalls during deceleration		The engine stops unexpectedly at the beginning of deceleration or recovery from deceleration.	(See NO.10 LOW IDLE/STALLS DURING DECELERATION [LF, L3] ).
11	Engine stalls/quits.	Acceleration/cruise	The engine stops unexpectedly at the beginning of acceleration or during acceleration. The engine stops unexpectedly while cruising.	(See NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [LF, L3] ).
	Engine runs rough.	Acceleration/cruise	The engine speed fluctuates during acceleration or cruising.
	Misses	Acceleration/cruise	The engine misses during acceleration or cruising.
	Buck/jerk	Acceleration/cruise/deceleration	The vehicle bucks/jerks during acceleration, cruising, or deceleration.
	Hesitation/stumble	Acceleration	A momentary pause at the beginning of acceleration or during acceleration.
	Surges	Acceleration/cruise	A momentary minor irregularity in engine output.
12	Lack/loss of power	Acceleration/cruise	The performance is poor under load (such as power down when climbing ills).	(See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [LF, L3] ).
13	Knocking/pinging	Acceleration/cruise	Sound is produced when the air/fuel mixture is ignited by something other than the spark plug (such as hot spot in combustion chamber).	(See NO.13 KNOCKING/PINGING/DETONATION-ACCELERATION/CRUISE [LF, L3] ).
14	Poor fuel economy		The fuel economy is unsatisfactory.	(See NO.14 POOR FUEL ECONOMY [LF, L3] ).
15	Emission compliance		Fails emissions test.	(See NO.15 EMISSION COMPLIANCE [LF, L3] ).
16	High oil consumption/leakage		The oil consumption is excessive.	(See NO.16 HIGH OIL CONSUMPTION/LEAKAGE [LF, L3] ).
17	Cooling system concerns	Overheating	The engine runs at higher than normal temperature/overheats.	(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [LF, L3] ).
18	Cooling system concerns	Runs cold	The engine does not reach normal operating temperature.	(See NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [LF, L3] ).
19	Exhaust smoke		Blue, black, or white smoke from exhaust system	(See NO.19 EXHAUST SMOKE [LF, L3] ).
20	Fuel odor (in engine compartment)		Gasoline fuel smell or visible leakage	(See NO.20 FUEL ODOR (IN ENGINE COMPARTMENT)[LF, L3] ).
21	Engine noise		Engine noise from under hood	(See NO.21 ENGINE NOISE [LF, L3] ).
22	Vibration concerns (engine)		Vibration from under hood or driveline	(See NO.22 VIBRATION CONCERNS (ENGINE)[LF, L3] ).
23	A/C does not work sufficiently.		The A/C compressor magnetic clutch does not engage when A/C is turned on.	(See NO.23 A/C DOES NOT WORK SUFFICIENTLY [LF, L3] ).
24	A/C is always on or A/C compressor runs continuously.		The A/C compressor magnetic clutch does not disengage.	(See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [LF, L3] ).
25	A/C is not cut off under WOT conditions.		The A/C compressor magnetic clutch does not disengage under wide open throttle.	(See NO.25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [LF, L3] ).
26	Exhaust sulphur smell		Rotten egg smell (sulphur) from exhaust	(See NO.26 EXHAUST SULPHUR SMELL [LF, L3] ).
27	Fuel refill concerns		The fuel tank does not fill smoothly.	(See NO.27 FUEL REFILL CONCERNS [LF, L3] ).
28	Fuel filling shut off issues		The fuel does not shut off properly.	(See NO.28 FUEL FILLING SHUT OFF CONCERNS [LF, L3] ).
29	Spark plug condition		An incorrect spark plug condition.	(See NO.29 SPARK PLUG CONDITION [LF, L3] ).
30	ATX concerns	Upshift/downshift engagement	ATX concerns not related to engine performance.	(See SYMPTOM TROUBLESHOOTING ITEM TABLE [FN4A-EL] .) (See SYMPTOM TROUBLESHOOTING ITEM TABLE [FS5A-EL] .)