No
Go to the next step.
8
INSPECT IGNITION SYSTEM
OPERATION
z
Perform the spark test.
(see
ENGINE CONTROL
SYSTEM OPERATION
INSPECTION [MZI-3.5]
.)
z
Are the results of the spark test
normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part
according to the spark test results, then go to
Step 18.
9
INSPECT MAF PID
z
Start the engine.
z
Access the MAF PID using the
M-MDS.
z
Verify that the MAF PID changes
quickly according to the engine
speed when the engine is raced.
z
Is the MAF PID response
normal?
Yes
Go to the next step.
No
Replace the MAF/IAT sensor, then go to
Step 18.
(see
INTAKE-AIR SYSTEM
REMOVAL/INSTALLATION [MZI-
3.5]
.)
10
INSPECT FOR EXCESSIVE AIR
SUCTION IN INTAKE AIR
SYSTEM
z
Inspect for air leakage at the
following:
{
Between the MAF/IAT
sensor and the throttle body
{
Between the throttle body
and the dynamic chamber
z
Is there any malfunction?
Yes
Repair or replace the suspected part, then go
to Step 18.
No
Go to the next step.
11
INSPECT FUEL LINE PRESSURE
z
Turn the ignition switch off.
z
Inspect the fuel line pressure.
(see
FUEL LINE PRESSURE
INSPECTION [MZI-3.5]
.)
z
Is there any malfunction?
Yes
If the fuel line pressure is too low, go to the
next step. If the fuel line pressure is
excessively high, check as follows:
z
Fuel pump maximum pressure
z
Fuel return line for clogging
{
If all of the above are normal,
replace the pressure regulator.
(see
PRESSURE
REGULATOR
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:31 AM
Page 162
© 2005 Mitchell Repair Information Company, LLC.
