Mazda 3 - 15 Emission Compliance [Lf]

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