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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 600 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3 WITH TC))NO. 18 COOLING SYSTEM CONCERNS-RUNS COLDDIAGNOSTIC PROCEDURE
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Diagnostic procedure

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Diagnostic procedure
WARNING: This page is about a different car, the 2007 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 Is customer complaint "Lack of passenger compartment heat" only? Yes Inspect the A/C 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 ).
No Go to the next step.
3 Cool down the engine.
Remove the thermostat and inspect operation.
(See THERMOSTAT REMOVAL/INSTALLATION ).
(See THERMOSTAT INSPECTION ).
Is thermostat normal?		 Yes Go to the next step.
No Replace the thermostat.
4 Perform the Cooling Fan Control System Operation Inspection.
(See COOLING FAN CONTROL SYSTEM INSPECTION ).
Does the cooling fan system operate properly?		 Yes Access the ECT PID using the M-MDS.
Inspect for both ECT PID and temperature gauge readings.
If the temperature gauge on instrument cluster indicates normal but ECT PID is not same as temperature gauge reading, inspect the ECT sensor.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ).
If the temperature gauge on instrument cluster indicates overheating but ECT PID is normal, inspect the instrument cluster.
(See WATER TEMPERATURE GAUGE ).
No Repair or replace malfunctioning part, according to inspection results.
5 Verify test results.
  • If normal, return to the diagnostic index to service any additional symptoms.
  • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the repair or diagnosis.
    • If the vehicle is repaired, troubleshooting is completed.
    • If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.