Mazda 3 Workshop Manual page 471

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Diagnostic procedure
STEP INSPECTION
Warm up the engine.
1 Idle the engine for 5 min.
Is the symptom disappeared?
Verify the following:
• External fuel shut off or accessory
(kill switch, alarm etc.)
• Fuel quality (such as proper octane,
contamination, winter/summer blend)
• No air leakage from intake-air system
• Proper sealing of intake manifold and
components attached to intake
manifold: IAC valve, EGR valve
2
• Ignition wiring
• Electrical connections
• Fuses
• Smooth operation of throttle valve
• PCM GND circuit (PCM terminal 1AZ,
1BC, 1BD, 1BG and/or 1BH)
Are all items normal?
Connect the WDS or equivalent to the
DLC-2.
Retrieve any continuous memory,
3
KOEO and KOER using WDS or
equivalent.
Are there any DTCs displayed?
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• 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 the "BEFORE SERVICE PRECAUTION" and
"AFTER SERVICE PRECAUTION" described in this manual.
(See BEFORE SERVICE
(See AFTER SERVICE PRECAUTION.)
Caution
• If there is foreign material on the connecting area of the quick release
connector, it might damage the connector or fuel pipe. To prevent this,
disconnect the connector and clean the connecting area before connecting.
RESULTS
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PRECAUTION.)
Troubleshooting completed. (Cause of this
symptom is that the idle learning of IAC
system is not completed.)
Go to the next step.
Go to the next step.
Service if necessary.
Repeat Step 2.
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE
No DTC is displayed:
Go to the next step.
- automotive repair manuals website
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