Mazda MX-5 Miata Sport 2007 Manual page 2022

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
(See COOLING FAN
CONTROL SYSTEM
INSPECTION .)
Does the cooling fan control
system function properly?
6 Is the drive belt normal?
7 Is there leakage around the
heater unit in passenger
compartment?
8 Is there leakage at the coolant
hoses and/or radiator?
9 Cool down the engine.
Remove thermostat and inspect
operation.
(See THERMOSTAT
REMOVAL/INSTALLATION
[LF] .)
(See THERMOSTAT
INSPECTION [LF] .)
Is thermostat normal?
10
Verify test results.



2007 Mazda MX-5 Miata Sport
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.

No Repair or replace the
malfunctioning part.
Yes Go to the next step.
No Replace the drive belt.
Yes Inspect and service
heater for leakage.
No Go to the next step.
Yes Replace the
malfunctioning part.
No Go to the next step.
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.