(See Engine Symptom Troubleshooting [Mzi-3.5].) - Mazda CX-9 Grand Touring 2007 Manual

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
11 Is engine compression correct?
12
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.

(See ENGINE SYMPTOM TROUBLESHOOTING [MZI-3.5].)

If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
NO. 15 EMISSION COMPLIANCE [MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
15 EMISSION COMPLIANCE
DESCRIPTION Fails emissions test.
2007 Mazda CX-9 Grand Touring
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 [MZI-3.5] .)
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
Exhaust system clogging
Fuel tank ventilation system malfunction
Fuel-filler cap malfunction
Charcoal canister damage
Air cleaner element clogging or restriction
Throttle body malfunction
Erratic signal to ignition coil
Improper air/fuel mixture ratio control operation
Bend or open circuit HO2S wiring harness
Catalyst converter malfunction
Engine internal parts malfunction
Excessive carbon is built up in combustion chamber
Yes Inspect the valve timing.
No Inspect for cause.