TP1, TP2 PID:
Inspect if output signal from TP sensor
changes smoothly.
VSS PID:
Inspect for open circuit of VSS and
related wiring harness intermittently.
5
Visually inspect the 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.
6
Inspect the spark plug conditions.
Is spark plug wet, covered with carbon
or grayish white?
Yes
Spark plug is wet or covered with
carbon:
Inspect for fuel leakage from fuel
injector.
Spark plug is grayish white:
Inspect the fuel injector for clogging.
No
Install the spark plugs on original
cylinders.
Go to the next step.
7
Remove and shake the PCV valve.
Does the PCV valve rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
8
Perform the electronic throttle control
system operation inspection.
(See
ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.5]
.)
Does the electronic throttle control
system function properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part
according to electronic throttle system
operation inspection results.
9
Visually inspect deformed exhaust
system part.
Is there any deformed exhaust system
part?
Yes
Replace the suspected part.
No
Go to the next step.
10
Install fuel pressure gauge between the
fuel pipe and fuel distributor.
Short check connector terminal F/P to
body GND using a jumper wiring.
Turn the ignition switch to the ON
position.
Is fuel line pressure correct with
ignition switch to ON position?
(see
FUEL LINE PRESSURE
INSPECTION [MZI-3.5]
.)
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump relay and fuel
pump circuit.
Inspect the fuel line for clogging.
If there is no malfunction, replace the
fuel pump unit.
(see
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
3.5]
.)
High:
Replace the fuel pump unit.
(see
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
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