15 Emission Compliance [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Does the PCV valve rattle?
Visually inspect the exhaust system part.
10
Is there any deformed exhaust system
part?
Inspect for contaminated the MAF
sensor.
11
Is there any contamination?
Inspect the MAF sensor for
contamination.
12
Is there any contamination?
Is engine compression correct?
13
(See COMPRESSION INSPECTION
[Z6].)
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.
14
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
NO.15 EMISSION COMPLIANCE [Z6]
15
DESCRIPTION Fails emissions test.
• Vacuum lines leakage or blockage
• Cooling system malfunction
• Spark plug malfunction
• Leakage from intake manifold
POSSIBLE
• Erratic or no signal from CMP sensor
CAUSE
• Inadequate fuel pressure
• PCV valve malfunction or incorrect valve installation
• EGR valve malfunction
Downloaded from
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Yes
No
Yes
No
Yes
No
Yes
No
EMISSION COMPLIANCE
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Replace the PCV valve.
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.
(See Timing Chain Installation
Inspect for cause.
[Z6].)
[Z6].)
- automotive repair manuals website
Note.)
B3E010318881W48