NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
temperature gauge and heat gauge
unit.
10
z
Verify test results.
{
If normal, return to diagnostic index to service any additional symptoms.
(See
ENGINE SYMPTOM TROUBLESHOOTING [MZI-3.5]
.)
{
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
z
If vehicle is repaired, troubleshooting completed.
z
If vehicle is not repaired or additional diagnostic information is not
available, replace the PCM.
(see
PCM REMOVAL/INSTALLATION [MZI-3.5]
.)
18
COOLING SYSTEM CONCERNS-RUNS COLD
DESCRIPTION
Engine takes excessive time to reach normal operating temperature.
POSSIBLE CAUSE
z
Thermostat malfunction
z
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
[MZI-3.5]
.)
No
Go to the next step.
3
Remove the thermostat and inspect
operation.
(see
THERMOSTAT
REMOVAL/INSTALLATION [MZI-
3.5]
.)
(see
THERMOSTAT INSPECTION
[MZI-3.5]
.)
Is thermostat normal?
Yes
Go to the next step.
No
Replace the thermostat.
4
Inspect cooling fan control system
Yes
Access ECT PID.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:37 AM
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