Mazda CX-9 Grand Touring 2009 Manual page 1017

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
INSPECT CMP SENSOR
Inspect the CMP sensor. (See
CRANKSHAFT POSITION
6
(CKP) SENSOR INSPECTION
[MZI-3.7] .)
Is there any malfunction?
VERIFY CKP SENSOR
INSTALLATION CONDITION
7
Inspect for CKP sensor looseness.
Is the CKP sensor loose?
INSPECT IGNITION SYSTEM
OPERATION
Perform the spark test. (See
ENGINE CONTROL SYSTEM
8
OPERATION INSPECTION
[MZI-3.7] .)
Are the results of the spark test
normal?
INSPECT MAF PID
Start the engine.
Access the MAF PID using the M-
MDS.
9
Verify that the MAF PID changes
quickly according to the engine speed
when the engine is raced.
Is the MAF PID response normal?
INSPECT FOR EXCESSIVE AIR
SUCTION IN INTAKE AIR SYSTEM
Inspect for air leakage at the
following:
10
Between the MAF/IAT sensor
and the throttle body
Between the throttle body and
the dynamic chamber
Is there any malfunction?
2008 Mazda CX-9 Grand Touring
malfunctioning parts.
Yes
Then go to Step 18.
No
Retighten the CKP sensor, then go to Step 18.
(See CRANKSHAFT POSITION (CKP)
Yes
SENSOR REMOVAL/INSTALLATION
[MZI-3.7] .)
No
Yes Go to the next step.
Repair or replace the malfunctioning part
No according to the spark test results, then go to Step
Yes Go to the next step.
Replace the MAF/IAT sensor, then go to Step 18.
No
REMOVAL/INSTALLATION [MZI-3.7] .)
Repair or replace the suspected part, then go to
Yes
Step 18.
No
If the fuel line pressure is too low, go to the next
If it is normal, replace CMP sensor. (See
CRANKSHAFT POSITION (CKP)
SENSOR REMOVAL/INSTALLATION
[MZI-3.7] .)
Go to the next step.
Go to the next step.
18.
(See INTAKE-AIR SYSTEM
Go to the next step.