NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.7]
NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE (MZI-3.7) DETECTION CONDITIONS
AND POSSIBLE CAUSES
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If vehicle is repaired, troubleshooting completed.
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If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See
PCM REMOVAL/INSTALLATION [MZI-3.7]
.)
13
KNOCKING/PINGING - ACCELERATION/CRUISE
DESCRIPTION
Sound is heard when air/fuel mixture is ignited by something other than spark plug
(such as hot spot in combustion chamber).
POSSIBLE
CAUSE
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Engine overheating due to cooling system malfunction
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CHT sensor malfunction
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IAT sensor malfunction
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MAF sensor malfunction
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Knock sensor malfunction
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Erratic signal from CMP sensor
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Inadequate engine compression
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Inadequate fuel pressure
WARNING:
The following troubleshooting flow chart contains the fuel system diagnosis
and repair procedures. Read the following warnings before servicing the fuel
system:
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Fuel vapor is hazardous. It can easily ignite, causing serious injury
and damage. Always keep sparks and flames away from fuel.
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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] .)
(See AFTER SERVICE PRECAUTION [MZI-3.7] .)
CAUTION:
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Disconnecting/connecting quick release connector without cleaning it
may cause damage to fuel pipe and quick release connector. Always
clean quick release connector joint area before
disconnecting/connecting, and make sure that it is free of foreign
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
Page 61
© 2005 Mitchell Repair Information Company, LLC.
