3. Verify that DTC P0661 or P0662 is not displayed.
If DTC P0661 or P0662 is shown, perform DTC inspection.
(See
DTC TABLE [LF]
.)
4. Inspect the variable intake air solenoid valve.
(See
VARIABLE INTAKE AIR SOLENOID VALVE INSPECTION [LF]
.)
If the variable intake air solenoid valve is not normal, replace the variable intake air solenoid
valve.
(See
INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF]
.)
If the variable intake air solenoid valve is normal, inspect the following:
Vacuum hose and vacuum chamber for looseness or damage
Shutter valve actuator
(See
VARIABLE INTAKE AIR SHUTTER VALVE ACTUATOR INSPECTION
[LF]
.)
Shutter valve stuck open or closed
FUEL INJECTOR OPERATION INSPECTION
If simulation function of M-MDS is used:
FUEL INJECTOR OPERATION INSPECTION TABLE
STEP
INSPECTION
RESULTS
ACTION
1
Start the engine and
warm it up until normal
operating temperature.
Connect the M-MDS or
equivalent to DLC-2.
Select the INJ_1,
INJ_2, INJ_3, and
INJ_4 PIDs Turn the
fuel injector from on to
off using the PIDs for
each cylinder.
Does the engine speed
drop?
Yes
Fuel injector work properly.
No
Engine speed does not drop any
cylinders:
Go to the next step.
Engine speed drop some
cylinders:
Go to Step 3.
2
Perform main relay
operation inspection.
(See
MAIN RELAY
Yes
Go to the next step.
No
Repair or replace
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:11 PM
Page 133
© 2005 Mitchell Repair Information Company, LLC.
