TROUBLESHOOTING
• A/C system operation is improper.
• Erratic signal or no signal from CMP sensor
• Air leakage from intake-air system parts
• Purge solenoid valve malfunction
• Improper operation of IAC valve
• EGR valve malfunction
• Erratic signal from CKP sensor
• Low engine compression
• Vacuum leakage
• Poor fuel quality
• Spark leakage from high-tension leads
• Air cleaner restriction
• PCV valve malfunction
• Improper valve timing due to jumping out timing belt
• Restriction in exhaust system
• Intermittent open or short in fuel body pump circuit
• Inadequate fuel pressure
POSSIBLE a Fuel pump body mechanical malfunction
CAUSE • Fuel leakage from fuel injector
• Fuel injector clogging
• Intermittent open or short of MAF sensor, TP sensor and VSS
• ATX malfunction
• Clutch slippage
Warning
• Following troubleshooting flow chart contains fuel system diagnosis and repair
procedures. Read following warnings before performing fuel system service:
— Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage.
Always keep sparks and flames away from fuel.
— Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries
or death and damage. Fuel can also irritate skin and eyes. To prevent this, always
complete "BEFORE REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE”. (See
Section F)
Caution
• Disconnecting/connecting the quick release connector without cleaning it may possibly
cause damage to the fuel pipe and quick release connector. Always clean the quick
release connector joint area before disconnecting/connecting, and make sure that it Is
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free of foreign material.
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Diagnostic Procedure
STEP
INSPECTION
RESULTS
ACTION
1 Verify following:
• Vacuum connection
• Air cleaner element
• No air leakage from intake-air system
• No restriction of intake-air system
• Proper sealing of intake manifold and
components attached to intake manifold;
such as EGR valve, IAC valve
• Ignition wiring
• Fuel quality (e.g. proper octane,
contamination, winter/summer blend)
• Electrical connections
• Smooth operation of throttle valve
Are all items okay?
Yes Go to next step.
No
Service as necessary.
Repeat Step 1.
2 Connect NGS tester to DLC.
Turn ignition switch on.
Retrieve any DTC.
Is any DTC displayed?
Yes
DTC Is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Go to next step.
3 Is engine overheating? j Yes
Go to symptom troubleshooting No. 16 “Cooling
system concerns - Overheating”. [
No Go to next step.
F1-122
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