NO.15 EMISSION COMPLIANCE [MZI-3.7]
NO.15 EMISSION COMPLIANCE (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
15
EMISSION COMPLIANCE
DESCRIPTION
Fails emissions test.
POSSIBLE
CAUSE
z
Vacuum lines leakage or blockage
z
Cooling system malfunction
z
Spark plug malfunction
z
Leakage from intake manifold
z
Erratic or no signal from CMP sensor
z
Inadequate fuel pressure
z
PCV valve malfunction or incorrect valve installation
z
Exhaust system clogging
z
Fuel tank ventilation system malfunction
z
Fuel-filler cap malfunction
z
Charcoal canister damage
z
Air cleaner element clogging or restriction
z
Throttle body malfunction
z
Erratic signal to ignition coil
z
Improper air/fuel mixture ratio control operation
z
Bend or open circuit HO2S wiring harness
z
Catalyst converter malfunction
z
Engine internal parts malfunction
z
Excessive carbon is built up in combustion chamber
z
Improper engine compression
z
Improper valve timing
WARNING:
The following troubleshooting flow chart contains fuel system diagnosis and
repair procedures. Read following warnings before servicing fuel system:
z
Fuel vapor is hazardous. It can easily ignite, causing serious injury
and damage. Always keep sparks and flames away from fuel.
z
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 "BEFORE SERVICE
PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this
manual.
(See BEFORE SERVICE PRECAUTION [MZI-3.7] .)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
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© 2005 Mitchell Repair Information Company, LLC.
