NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [LF]
POSSIBLE CAUSE & DESCRIPTION (COOLING SYSTEM CONCERNS-RUNS COLD)
DIAGNOSTIC PROCEDURE
COOLING SYSTEM CONCERNS-RUNS COLD DIAGNOSTIC PROCEDURE TABLE
If vehicle is not repaired or additional diagnostic information
is not available, replace the PCM.
(See
PCM REMOVAL/INSTALLATION [LF]
.)
18
COOLING SYSTEM CONCERNS-RUNS
COLD
DESCRIPTION
Engine takes excessive time to reach normal
operating temperature.
POSSIBLE CAUSE
Thermostat malfunction
Cooling fan system malfunction
STEP
INSPECTION
RESULTS
ACTION
1
Is customer complaint "Lack of
passenger compartment heat"
only?
Yes
Inspect A/C and heater
system.
No
Go to the next step.
2
Does the engine speed continue
at fast idle?
Yes
Go to symptom
troubleshooting "No.9
Fast idle/runs on".
(See
NO.9 FAST
IDLE/RUNS ON
[LF]
.)
No
Go to the next step.
3
Remove the thermostat and
inspect operation.
(See
THERMOSTAT
REMOVAL/INSTALLATION
[LF]
.)
(See
THERMOSTAT
INSPECTION [LF]
.)
Is thermostat normal?
Yes
Go to the next step.
No
Replace the thermostat.
4
Inspect cooling fan control
system operation.
(See
COOLING FAN
CONTROL SYSTEM
INSPECTION
.)
Does the cooling fan control
system function properly?
Yes
Access ECT PID.
Inspect for both ECT
PID and temperature
gauge on instrument
cluster readings.
If the temperature
gauge on the
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
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