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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3)NO. 18 COOLING SYSTEM CONCERNS-RUNS COLDDIAGNOSTIC PROCEDURE
2006 Mazda 6 i, 4D Sedan, Automatic

Diagnostic procedure

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Diagnostic procedure
DIAGNOSTIC PROCEDURE

STEP INSPECTION 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 engine speed continue during fast idle? Yes Go to symptom troubleshooting "NO. 9 FAST IDLE/RUNS ON ".
No Go to the next step.
3 Remove thermostat and inspect operation.
(See THERMOSTAT REMOVAL/INSTALLATION ).
(See THERMOSTAT INSPECTION ).
Is thermostat normal?		 Yes Go to the next step.
No Replace thermostat.
4 Inspect cooling fan control system operation.
(See COOLING FAN CONTROL SYSTEM INSPECTION ).
Does cooling fan control system work properly?		 Yes Access ECT PID.
Inspect for both ECT PID and temperature gauge on instrument cluster 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 cold range but ECT PID is normal, inspect temperature gauge and heat gauge unit.
No Repair or replace malfunctioning part.
5 Verify test results.
  • If okay, return to diagnostic index to service any additional symptoms.
  • If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
    • If vehicle is repaired, troubleshooting completed.
    • If vehicle is not repaired or additional diagnostic information is not available, reprogram PCM if 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.