Mazda MX-5 Miata Sport 2007 Manual page 1998

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
5 Visually inspect the
CKP sensor and teeth of
crankshaft pulley.
Are CKP sensor and
teeth of crankshaft
pulley normal?
6 Inspect the spark plug
conditions.
Is spark plug wet,
covered with carbon or
grayish white?
7 Remove and shake the
PCV valve.
Does the PCV valve
rattle?
8 Perform the electronic
throttle control system
operation inspection.
(See ELECTRONIC
THROTTLE
CONTROL SYSTEM
INSPECTION .)
Does the electronic
throttle control system
function properly?
9 Visually inspect
deformed exhaust
system part.
Is there any deformed
exhaust system part?
10 Install fuel pressure
gauge between the fuel
pipe and fuel
distributor.
Short check connector
terminal F/P to body
GND using a jumper
wiring.
Turn the ignition switch
to the ON position.
Is fuel line pressure
2007 Mazda MX-5 Miata Sport
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Go to the next step.
Replace the malfunctioning part.
Spark plug is wet or covered
with carbon:
Inspect for fuel leakage from
fuel injector.
Spark plug is grayish white:
Inspect the fuel injector for
clogging.
Install the spark plugs on
original cylinders.
Go to the next step.
Go to the next step.
Replace the PCV valve.
Go to the next step.
Repair or replace the
malfunctioning part according to
electronic throttle system
operation inspection results.
Replace the suspected part.
Go to the next step.
Go to the next step.
Zero or low:
Inspect the fuel pump relay and
fuel pump circuit.
Inspect the fuel line for
clogging.
If there is no malfunction,
replace the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION
[LF] .)