Mazda CX-9 Grand Touring 2007 Manual page 875

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
16 Is the engine compression correct?
17
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.13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
13 KNOCKING/PINGING - ACCELERATION/CRUISE
Sound is heard when air/fuel mixture is ignited by something other than spark plug
DESCRIPTION
(such as hot spot in combustion chamber).
POSSIBLE CAUSE
WARNING:
The following troubleshooting flow chart contains the fuel system diagnosis
and repair procedures. Read the following warnings before servicing the fuel
system:
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] .)
Engine overheating due to cooling system malfunction
CHT sensor malfunction
IAT sensor malfunction
MAF sensor malfunction
Knock sensor malfunction
Erratic signal from CMP sensor
Inadequate engine compression
Inadequate fuel pressure
Fuel vapor is hazardous. It can easily ignite, causing serious injury and
damage. Always keep sparks and flames away from fuel.
Fuel line spills and leakage are dangerous. Fuel can ignite and cause
Yes Inspect the following:
Valve timing
Internal transaxle components
Brake system for dragging
No Inspect for cause.