2.
Turn the ignition switch
to the ON position
(Engine off).
Retrieve any DTCs.
Are there any DTCs
displayed?
inspection.
(See
DTC TABLE [LF]
.)
No
No DTC is displayed:
Go to the next step.
3
Is engine overheating?
Yes
Go to symptom troubleshooting
"No.17 Cooling system
concerns-Overheating".
(See
NO.17 COOLING
SYSTEM CONCERNS-
OVERHEATING [LF]
.)
No
Go to the next step.
4
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.
5
Inspect the spark plug
conditions.
Is spark plug wet,
covered with carbon or
grayish white?
Yes
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.
No
Install the spark plugs on
original cylinders.
Go to the next step.
6
Visually inspect the
CKP sensor and teeth of
crankshaft pulley.
Are the CKP sensor and
teeth of crankshaft
pulley normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
7
Remove and shake the
PCV valve.
Does the PCV valve
rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
8
Attempt to start engine
at part throttle.
Does engine run
smoothly at part
throttle?
Yes
Inspect the electronic throttle
control system operation.
(See
ELECTRONIC
THROTTLE CONTROL
SYSTEM INSPECTION
.)
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:09 PM
Page 23
© 2005 Mitchell Repair Information Company, LLC.
