Access RPM PID.
Is RPM PID indicating engine speed
during engine cranking?
No
Inspect for the following:
z
Open or short circuit in CKP
sensor
z
Open or short circuit in wiring
harness between CKP sensor
terminal A and PCM terminal 2P
z
Open or short circuit in wiring
harness between CKP sensor
terminal B and PCM terminal 2T
z
Open or short circuit in CKP
sensor wiring harnesses
If CKP sensor and wiring harness are
normal, go to the next step.
15
Visually inspect CKP sensor and teeth
of crankshaft pulley.
Are CKP sensor and teeth of crankshaft
pulley normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
16
Inspect the ignition coil related wiring
harness condition (intermittent open or
short circuit) for all cylinders. Are
wiring harness conditions normal?
Yes
Go to the next step.
No
Repair the wiring harnesses.
17
Perform the spark test.
(See
ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.5]
.)
Is strong blue spark visible at each
cylinder?
Yes
Go to the next step.
If symptoms occurs with the A/C on, go
to Step 24.
No
Repair or replace the malfunctioning part
according to spark test result.
18
Inspect the spark plug condition.
Is spark plug wet, covered with carbon
or grayish white?
Yes
Spark plug is wet or covered with
carbon:
Inspect for fuel leakage from injector.
Spark plug is grayish white:
Inspect the fuel injector for clogging.
No
Install spark plugs on original cylinders.
Go to the next step.
19
Remove and shake the PCV valve.
Does the PCV valve rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
20
visually inspect the exhaust system
part.
Is there any deformed exhaust system
part?
Yes
Replace the suspected part.
No
Go to the next step.
21
Install the fuel pressure gauge between
the fuel pipe and the fuel distributor.
Yes
Go to the next step.
No
Zero or low:
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:37 AM
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