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SYMPTOM CHART
warningWhen 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.
cautionDuring diagnosis, a DTC associated with other systems may be stored when the ignition switch is turned on with connector(s) disconnected. On completion, confirm all systems for DTC(s). If DTC(s) are stored, erase them all.
cautionDisconnecting 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.
 
 
noteCheck that the ECM ground circuit is normal before checking for the cause of the problem.
 
 
TROUBLE SYMPTOMSINSPECTION PROCEDUREREFERENCE PAGE
Communication with scan tool is impossibleCommunication with ECM only is not possible1
Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) and related partsThe Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) does not illuminate right after the ignition switch is turned to the "ON" position2
The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) remains illuminated and never goes out3
StartingCranks, won't start4
Starts up and dies5
Hard starting6
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 decelerating13
DrivingHesitation, sag, stumble, poor acceleration or surge14
Acceleration shock15
Knocking16
Dieseling (run-on)17
Too high CO and HC concentration when idling18
IM240 test failureTransient, mass emission tailpipe test failure19
Purge flow test of the evaporative emission canister failure20
Pressure test of the evaporative system failure21
Generator output voltage is low (approximately 12.8 volts)22
In running, the ECO mode indicator shows nothing23
Power supply system and ignition switch-IG system24
Fuel pump system25
Ignition switch-ST system and transmission range switch system26
Ignition circuit system27
A/C system28
Engine oil pressure switch (for warning lamp) system29
 
 
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
ITEMSSYMPTOM
At startingWon't start The starter cranks the engine, but there is no combustion within the cylinders, and the engine won't start.
Starts up and diesThe engine starts, but then engine soon stalls.
Hard startingEngine starts after cranking a while.
Idling stabilityHuntingEngine speed doesn't remain constant; changes at idle.
Rough idleUsually, 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 speedThe 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 drivingHesitation 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 accelerationPoor 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.
StumbleEngine speed increase is delayed when the accelerator pedal is initially depressed for acceleration.
ShockThe feeling of a comparatively large impact or vibration when the engine is accelerated or decelerated.
SurgeThis is slight acceleration and deceleration feel usually felt during steady, light throttle cruise. Most notable under light loads.
KnockingA sharp sound during driving, which sounds like a hammer striking the cylinder walls. It makes poor driveability.
At stoppedRun 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".