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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3)NO. 21 ENGINE NOISEDIAGNOSTIC 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 squeal, click or chirp sound present? Yes Inspect engine oil level or drive belts.
No Go to the next step.
2 Is rumble or grinding noise present? Yes Inspect drive belts.
No Go to the next step.
3 Is rattle noise present? Yes Inspect location of rattle for loose parts.
No Go to the next step.
4 Is hissing noise present? Yes Inspect for following:
No Go to the next step.
5 Is rap or roar noise present? Yes Inspect exhaust system for loose parts.
No Go to the next step.
6 Is knocking noise present? Yes Go to symptom troubleshooting "NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES ".
No If noise comes from engine internal, inspect for friction gear, timing chain or MLA noise.
7 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.