Start the engine and idle
it.
Access LONG FT1
PID.
Measure LONG FT1
PID at idle.
Is PID value normal?
(See
PCM
INSPECTION [LF]
.)
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.
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?
Yes
Check if purge solenoid valve is
stuck open mechanically.
Inspect EVAP control system.
No
Go to the next step.
16
Remove and shake the
PCV valve.
Does the PCV valve
rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
17
Visually inspect the
exhaust system part.
Is there any deformed
exhaust system part?
Yes
Replace the suspected part.
No
Go to the next step.
18
Visually inspect the
CMP sensor and teeth
of camshaft.
Are the CMP sensor
and teeth of camshaft
normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
19
Inspect the engine
condition while tapping
EGR valve housing.
Does the engine
condition improve?
Yes
Replace the EGR valve.
No
Go to the next step.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 53
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