If CKP sensor and wiring
harness are normal, go to the
next step.
14
Visually inspect CKP
sensor and teeth of
crankshaft pulley.
Are CKP sensor and
teeth of crankshaft
pulley normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
15
Inspect the ignition coil
related wiring harness
condition (intermittent
open or short circuit)
for all cylinders. Are
wiring harness
conditions normal?
Yes
Go to the next step.
No
Repair the wiring harnesses.
16
Perform the spark test.
(See
SPARK TEST
.)
Is strong blue spark
visible at each cylinder?
Yes
Go to the next step.
If symptoms occurs with the
A/C on, go to Step 24.
No
Repair or replace the
malfunctioning part according to
spark test result.
17
Inspect the spark plug
condition.
Is spark plug wet,
covered with carbon or
grayish white?
Yes
Spark plug is wet or covered
with carbon:
Inspect for fuel leakage from
injector.
Spark plug is grayish white:
Inspect the fuel injector for
clogging.
No
Install spark plugs on original
cylinders.
Go to the next step.
18
Remove and shake the
PCV valve.
Does the PCV valve
rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
19
Visually inspect the
exhaust system part.
Is there any deformed
exhaust system part?
Yes
Replace the suspected part.
No
Go to the next step.
20
Install the fuel pressure
gauge between the fuel
pipe and the fuel
distributor.
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump relay and
fuel pump circuit.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:09 PM
Page 33
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