15 Emission Compliance [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Visually inspect the exhaust system part.
9
Is there any deformed exhaust system
part?
Inspect for contaminated MAF sensor.
10
Is there any contamination?
Inspect the MAF sensor for
contamination.
11
Is there any contamination?
12 Is engine compression correct?
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING
• If malfunction remains, inspect related Service information perform repair or diagnosis.
13
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See PCM REMOVAL/INSTALLATION
NO.15 EMISSION COMPLIANCE [LF]
15
DESCRIPTION Fails emissions test.
• Vacuum lines leakage or blockage
• Cooling system malfunction
• Spark plug malfunction
• Leakage from intake manifold
• Erratic or no signal from CMP sensor
POSSIBLE
• Inadequate fuel pressure
CAUSE
• PCV valve malfunction or incorrect valve installation
• EGR valve malfunction
• Exhaust system clogging
• Fuel tank ventilation system malfunction
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EMISSION COMPLIANCE
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Replace the suspected part.
Go to the next step.
Go to the next step.
Inspect for cause.
Replace the MAF sensor.
Go to the next step.
Inspect valve timing.
Inspect for cause.
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B3E010318881W17