(See
COOLING FAN
CONTROL SYSTEM
INSPECTION
.)
Does the cooling fan control
system function properly?
No
Repair or replace the
malfunctioning part.
6
Is the drive belt normal?
Yes
Go to the next step.
No
Replace the drive belt.
7
Is there leakage around the
heater unit in passenger
compartment?
Yes
Inspect and service
heater for leakage.
No
Go to the next step.
8
Is there leakage at the coolant
hoses and/or radiator?
Yes
Replace the
malfunctioning part.
No
Go to the next step.
9
Cool down the engine.
Remove thermostat and inspect
operation.
(See
THERMOSTAT
REMOVAL/INSTALLATION
[LF]
.)
(See
THERMOSTAT
INSPECTION [LF]
.)
Is thermostat normal?
Yes
The engine coolant
temperature and
thermostat are normal,
inspect engine block for
leakage or blockage.
No
Access ECT PID.
Inspect for both ECT
PID and temperature
gauge readings.
If temperature gauge on
instrument cluster
indicates normal range
but ECT PID is not
same as temperature
gauge reading, inspect
ECT sensor.
If temperature gauge on
instrument cluster
indicates overheating
but ECT PID is normal,
inspect temperature
gauge and heat gauge
unit.
10
Verify test results.
If normal, return to diagnostic index to service any additional
symptoms.
(See
ENGINE SYMPTOM TROUBLESHOOTING [LF]
.)
If malfunction remains, inspect related Service Bulletins and/or On-
line Repair Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 89
© 2005 Mitchell Repair Information Company, LLC.