Mazda MX-5 Miata Sport 2007 Manual page 1986

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Start the engine and idle
it.
Access LONG FT1
PID.
Measure LONG FT1
PID at idle.
Is PID value normal?
(See PCM
INSPECTION [LF] .)
15 Disconnect the vacuum
hose between the purge
solenoid valve and the
intake manifold from
purge solenoid valve
side.
Plug opening end of
vacuum hose.
Start the engine.
Does the engine
condition improve?
16 Remove and shake the
PCV valve.
Does the PCV valve
rattle?
17 Visually inspect the
exhaust system part.
Is there any deformed
exhaust system part?
18 Visually inspect the
CMP sensor and teeth
of camshaft.
Are the CMP sensor
and teeth of camshaft
normal?
19 Inspect the engine
condition while tapping
EGR valve housing.
Does the engine
condition improve?
2007 Mazda MX-5 Miata Sport
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Less than specification (too
rich):
Inspect EVAP control

system.
If system is normal,

go to Step 14.
Greater than specification (too
lean):
Inspect for air leakage at

intake-air system
components.
If system is normal,

go to the next step.
Check if purge solenoid valve is
stuck open mechanically.
Inspect EVAP control system.
Go to the next step.
Go to the next step.
Replace the PCV valve.
Replace the suspected part.
Go to the next step.
Go to the next step.
Replace the malfunctioning part.
Replace the EGR valve.
Go to the next step.