13A-SYMPTOM CHART

SYMPTOM CHART

warning

When touching the throttle valve, surely shut off the driving circuits of the throttle valve.

In the event that the throttle valve is operated, a finger might be injured as the result of being caught by the throttle valve.

caution

During diagnosis, a DTC associated with other systems may be set when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are set, erase them all.

caution

Disconnecting the battery cables or removing the combination meter will erase the learned value of the fuel gauge. To recover the learned value, input a vehicle speed (by actually driving the vehicle or inputting a simulated vehicle speed), and stop the vehicle. This will complete the learning process.

note	Check that the ECM ground circuit is normal before checking for the cause of the problem.

note	When the racing (2,000 to 5,000 r/min or more) continues on the vehicle stopped with no load during the specified time or more, the increase in the engine speed might be limited. This comes from the engine protection and control functions and is not a malfunction.

TROUBLE SYMPTOMS		INSPECTION PROCEDURE	REFERENCE PAGE
Communication with scan tool is impossible	Communication with ECM is not possible	1
Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) and related parts	The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) does not illuminate right after the ignition switch is turned to the "ON" position	2
	The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) remains illuminated and never goes out	3
Starting	Cranks, won't start	4
	Starts up and dies	5
	Hard starting	6
Idling stability (improper idling)	Unstable idle (rough idle, hunting)	7
	Idle speed is high (improper idle speed)	8
	Idle speed is low (improper idle speed)	9
Idling stability (engine stalls)	When the engine is cold, it stalls at idle (die out)	10
	When the engine is hot, it stalls at idle (die out)	11
	The engine stalls when accelerating (pass out)	12
	The engine stalls when decelerating	13
Driving	Hesitation, sag, stumble, poor acceleration or surge	14
	Acceleration shock	15
	Knocking	16
Dieseling (run-on)		17
Too high CO and HC concentration when idling		18
IM240 test failure	Transient, mass emission tailpipe test failure	19
	Purge flow test of the evaporative emission canister failure	20
	Pressure test of the evaporative system failure	21
Power supply system and ignition switch-IG system		22
Fuel pump system		23
Ignition switch-ST system and starter relay system		24
Ignition circuit system		25
A/C system		26
Engine oil pressure switch system		27

PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)

ITEMS		SYMPTOM
At starting	Won't start	The starter cranks the engine, but there is no combustion within the cylinders, and the engine won't start.
	Starts up and dies	The engine starts, but then engine soon stalls.
	Hard starting	Engine starts after cranking a while.
Idling stability	Hunting	Engine speed doesn't remain constant; changes at idle.
	Rough idle	Usually, a judgment can be based upon the movement of the tachometer pointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.
	Incorrect idle speed	The engine doesn't idle at the correct speed.
	Engine stall (die out)	The engine stalls when the foot is taken from the accelerator pedal, regardless of whether the vehicle is moving or not.
	Engine stall (pass out)	The engine stalls when the accelerator pedal is depressed.
At driving	Hesitation Sag	"Hesitation" is the delay in response of the vehicle speed (engine speed). This occurs when the accelerator is depressed in order to accelerate from the speed at which the vehicle is now traveling, or a temporary drop in vehicle speed (engine speed) during such acceleration. Serious hesitation is called "sag".
	Poor acceleration	Poor acceleration is inability to obtain an acceleration corresponding to the degree of throttle opening, even though acceleration is smooth. Also the inability to reach maximum speed.
	Stumble	Engine speed increase is delayed when the accelerator pedal is initially depressed for acceleration.
	Shock	The feeling of a comparatively large impact or vibration when the engine is accelerated or decelerated.
	Surge	This is slight acceleration and deceleration feel usually felt during steady, light throttle cruise. Most notable under light loads.
	Knocking	A sharp sound during driving, which sounds like a hammer striking the cylinder walls. It makes poor driveability.
At stopped	Run on ("dieseling")	The condition in which the engine continues to run after the ignition switch is turned to the "LOCK" (OFF) position. Also called "dieseling".