DIAGNOSTIC PROCEDURE
NO.8 ENGINE RUNS ROUGH/ROLLING IDLE (MZI-3.7) DIAGNOSTIC PROCEDURE
WARNING:
The following troubleshooting flow chart contains fuel system diagnosis and
repair procedures. Read following warnings before servicing the 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] .)
(See AFTER SERVICE PRECAUTION [MZI-3.7] .)
CAUTION:
z
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
material.
STEP
INSPECTION
RESULTS
ACTION
1
Warm up the engine.
Idle the engine for
5 min.
Is the symptom disappeared?
Yes
Troubleshooting completed. (Cause of this
symptom is that the idle learning of
electronic throttle control system is not
completed.)
No
Go to the next step.
2
Verify the following:
z
External fuel shut off or accessory
(such as kill switch, alarm)
z
Fuel quality (such as proper octane,
contamination, winter/summer
blend)
z
No air leakage from intake-air
system
z
Proper sealing of intake manifold
and components attached to intake
manifold
Yes
Go to the next step.
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 43
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