10502147

TROUBLESHOOTING

1.

Power supply

A.

Battery

B.

Fusible link

C.

Fuse

2.

Body ground

3.

Fuel supply

A.

Fuel line

B.

Fuel filter

C.

Fuel pump

4.

Ignition system

A.

Spark plug

B.

High-tension cable

C.

Ignition coil

5.

Emission control system

A.

PCV system

B.

Vacuum leak

6.

Others

A.

Ignition timing

B.

Idle speed

TROUBLESHOOTING GUIDE CHART

note

The number herein means the check order.

MFI TROUBLESHOOTING PROCEDURES

PROBLEM

Scan tool communication with PCM is not possible

Comment	Probable cause
One of the following causes may be suspected ● No power supply to PCM ● Defective ground circuit of PCM ● Defective PCM ● Improper communication line between PCM and scan tool	● Malfunction of PCM power supply circuit. ● Malfunction of the PCM. ● Open circuit between PCM and DLC.

ENGINE WILL NOT START

TROUBLESHOOTING

Trouble symptom	Probable cause	Remedy
Engine will not crank.	Battery charge low	Charge or replace battery
	Battery cables loose, corroded or worn	Repair or replace cables
	Transaxle range switch faulty (Vehicle with automatic transaxle only)	Adjust or replace switch
	Fusible link blown	Replace fusible link
	Starter motor faulty	Repair starter motor
	Ignition switch faulty	Replace ignition switch
Engine cranks slowly	Battery charge low	Charge or replace battery
	Battery cables loose, corroded or worn	Repair or replace cables
	Starter motor faulty	Repair starter motor
Starter keeps running	Starter motor faulty	Repair starter motor
Starter keeps running	Ignition switch faulty	Replace ignition switch
Starter spins but engine will not crank	Pinion gear teeth broken or starter motor faulty	Repair starter motor
Starter spins but engine will not crank	Ring gear teeth broken	Replace flywheel ring gear or torque converter

FUEL TANK AND FUEL LINE

Trouble symptom	Probable cause	Remedy
Engine malfunctions due to insufficient fuel supply	Bent or kinked fuel pipe or hose	Repair or replace
	Clogged fuel pipe or hose	Clean or replace.
	Clogged fuel filter of in-tank fuel filter	Replace
	Water in fuel filter	Replace the fuel filter or clean the fuel tank and fuel lines
	Dirty or rusted fuel tank interior	Clean or replace
	Malfunctioning fuel pump (clogged filter in the pump)	Replace
Evaporative emission system malfunction (when fuel filler cap is removed, pressure is released)	Incorrect routing of a vapor line	Correct
	Disconnected vapor line	Correct
	Folded, bent, cracked or clogged vapor line	Replace
	Faulty fuel tank cap	Replace
	Malfunctioning overfill limiter (two-way valve)	Replace

DIFFICULT TO START (ENGINE CRANKS)

ROUGH IDLE OR ENGINE STALLS

ENGINE HESITATES OR ACCELERATES POORLY