Mazda CX-9 Grand Touring 2007 Manual page 887

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
10
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.
NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
18 COOLING SYSTEM CONCERNS-RUNS COLD
DESCRIPTION Engine takes excessive time to reach normal operating temperature.
POSSIBLE CAUSE
DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
STEP INSPECTION
1 Is customer complaint "Lack of passenger
compartment heat" only?
2 Does the engine speed continue at fast
idle?
3 Remove the thermostat and inspect
operation.
(see THERMOSTAT
REMOVAL/INSTALLATION [MZI-
3.5] .)
(see THERMOSTAT INSPECTION
[MZI-3.5] .)
Is thermostat normal?
4 Inspect cooling fan control system
2007 Mazda CX-9 Grand Touring
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not
available, replace the PCM.
(see PCM REMOVAL/INSTALLATION [MZI-3.5] .)
Thermostat malfunction
Cooling fan system malfunction
temperature gauge and heat gauge
unit.
RESULTS ACTION
Yes Inspect A/C and heater system.
No Go to the next step.
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.
Yes Go to the next step.
No Replace the thermostat.
Yes Access ECT PID.