4-6
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TROUBLESHOOTING
4. Pressure regulator inspection
Inspect the fuel pressure and record it (page 5-111).
Disconnect the pressure regulator vacuum tube.
Inspect the fuel pressure.
Is the fuel pressure higher with the vacuum tube disconnected?
YES – GO TO STEP 5.
NO – Faulty pressure regulator.
5. Fuel injector inspection
Inspect the fuel injector (page 5-116).
Is the fuel injector normal?
YES – GO TO STEP 6.
NO – • Repair the open or short circuit in the fuel injection wire
• Faulty fuel injector
6. IAC valve inspection
Replace the IAC valve with a new one and start the engine.
Engine sometimes misfires or tends to stall?
YES – Replace the ECM with a new one and recheck.
NO – Faulty original IAC valve.
ENGINE DOES NOT RUN SMOOTHLY
ENGINE SPEED IS HIGHER THAN THE SPECIFIED IDLE SPEED AFTER WARMING UP
1. Alert system inspection
Turn the combination switch ON.
Check the warning buzzer sound.
Does the warning buzzer sound twice and then keep sounding?
YES – Perform alert/warning system troubleshooting (page 4-18).
NO – GO TO STEP 2.
2. Engine idle speed inspection
Adjust by turning the idle adjusting screw in or out.
Is the engine speed normal?
YES – Improper idle adjusting screw.
NO – GO TO STEP 3.
3. Pressure regulator inspection
Inspect the fuel pressure and record it (page 5-111).
Disconnect the pressure regulator vacuum tube.
Inspect the fuel pressure.
Is the fuel pressure higher with the vacuum tube disconnected?
YES – GO TO STEP 4.
NO – Faulty pressure regulator.
4. IAC valve inspection
Replace the IAC valve with a new one and start the engine.
Is the engine idle speed normal?
YES – Faulty original IAC valve.
NO – GO TO STEP 5.
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