Mazda CX-9 Grand Touring 2007 Manual page 844

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