NO.15 EMISSION COMPLIANCE [LF]
POSSIBLE CAUSE & DESCRIPTION (EMISSION COMPLIANCE)
9
Visually inspect the
exhaust system part.
Is there any deformed
exhaust system?
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 MAF sensor.
No
Go to the next step.
12
Is engine compression
correct?
Yes
Inspect the 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 Bulletins and/or On-
line Repair Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information
is not available, replace the PCM.
(See
PCM REMOVAL/INSTALLATION [LF]
.)
15
EMISSION COMPLIANCE
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
Inadequate fuel pressure
PCV valve malfunction or incorrect valve
installation
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
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© 2005 Mitchell Repair Information Company, LLC.