Diagnostic Index

SYMPTOM DIAGNOSTIC CHART

No.	TROUBLESHOOTING ITEM		DESCRIPTION
1	Melting of main or other fuses		-
2	MIL illuminates		MIL is illuminated incorrectly.
3	Will not crank		Starter does not work.
4	Hard to start/long crank/erratic start/erratic crank		Starter cranks the engine at normal speed but the engine requires excessive cranking time before starting. Battery is operating normally.
5	Engine stalls	After start/at idle	Engine stops unexpectedly at idle or after start or both.
6	Cranks normally but will not start		Starter cranks engine at normal speed but engine will not run. Refer to symptom troubleshooting "NO. 5 ENGINE STALLS-AFTER START/AT IDLE " if this symptom appears after the engine stalls. Fuel is in tank. Battery is in normal condition.
7	Slow return to idle		Engine takes more time than normal to return to idle speed. Engine speed continues at fast idle after warm-up.
8	Engine runs rough/rolling idle		Engine speed fluctuates between the specified idle speed and lower speed, and engine shakes excessively. Idle speed is too slow and the engine shakes excessively.
9	Fast idle/runs on		Engine speed continues at fast idle after warm-up. Engine runs after the ignition is switched off.
10	Low idle/stalls during deceleration		Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
11	Engine stalls/quits	Acceleration/cruise	Engine stops unexpectedly at beginning of acceleration or during acceleration. Engine stops unexpectedly while cruising.
	Engine runs rough	Acceleration/cruise	Engine speed fluctuates during acceleration or cruising.
	Misses	Acceleration/cruise	Engine misses during acceleration or cruising.
	Buck/jerk	Acceleration/cruise/deceleration	Vehicle bucks/jerks during acceleration, cruising, or deceleration.
	Hesitation/stumble	Acceleration	Momentary pause at beginning of acceleration or during acceleration.
	Surges	Acceleration/cruise	Momentary minor irregularity in engine output.
12	Lack/loss of power	Acceleration/cruise	Performance is poor under load (e.g., power down when climbing hills).
13	Knocking/pinging		Sound is produced when air/fuel mixture is ignited by something other than a spark plug (e.g., hot spot in the combustion chamber).
14	Poor fuel economy		Fuel economy is unsatisfactory.
15	Emission compliance		Fails emissions test.
16	High oil consumption/leakage		Oil consumption is excessive.
17	Cooling system concerns	Overheating	Engine runs at higher than normal temperature/overheats.
18	Cooling system concerns	Runs cold	Engine does not reach normal operating temperature.
19	Exhaust smoke		Blue, black, or white smoke from exhaust system.
20	Fuel odor (in engine compartment)		Gasoline fuel smell or visible leakage.
21	Engine noise		Engine noise from under hood.
22	Vibration concerns (engine)		Vibration from under the hood or driveline.
23	A/C does not work sufficiently		A/C compressor magnetic clutch does not engage when A/C is turned on.
24	A/C is always on or A/C compressor runs continuously		A/C compressor magnetic clutch does not disengage.
25	A/C is not cut off under wide open throttle conditions		A/C compressor magnetic clutch does not disengage under WOT
26	Exhaust sulphur smell		Rotten egg smell (sulphur) from exhaust.
27	Fuel refill concerns		Fuel tank does not fill smoothly.
28	Fuel filling shut off concerns		Fuel does not shut off properly.
29	Spark plug condition		Incorrect spark plug condition.