Fuel Injector Operation Inspection - Mazda MX-5 Miata Sport 2007 Manual

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
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:





FUEL INJECTOR OPERATION INSPECTION

If simulation function of M-MDS is used:
FUEL INJECTOR OPERATION INSPECTION TABLE
STEP
1
2
2007 Mazda MX-5 Miata Sport
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
INSPECTION
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?
Perform main relay
operation inspection.
(See MAIN RELAY
RESULTS
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.
Yes Go to the next step.
No Repair or replace
ACTION