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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3)NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISEDIAGNOSTIC 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 Connect WDS or equivalent to DLC-2.
Access ECT PID.
Verify ECT PID is less than 116°C {241°F}  during driving.
Is ECT PID less than specification?		 Yes Go to the next step.
No Inspect cooling system for cause of overheating.
2 Connect WDS or equivalent to DLC-2.
Access IAT and MAF PIDs.
Monitor each PID.
(See PCM INSPECTION ).
Are PIDs normal?		 Yes Go to the next step.
No If IAT PID is not specified  : Inspect IAT sensor
If MAF PID is not specified  : Inspect MAF sensor
3 Connect WDS or equivalent to DLC-2.
Turn key to ON (engine off).
Are there any DTCs displayed?		 Yes DTC is displayed: 
Go to appropriate DTC test.
No No DTC is displayed: 
Go to the next step.
4 Is engine compression correct? Yes Go to the next step.
No Inspect for cause.
5 Install fuel pressure gauge between fuel pipe and fuel distributor.
Start engine and idle it.
Measure fuel line pressure during idle.
Is fuel line pressure correct during idle?
(See FUEL LINE PRESSURE INSPECTION ).		 Yes Inspect ignition timing.
No Zero or low: 
Inspect fuel pump relay and fuel pump circuit.
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High: 
Replace fuel pump unit.
6 Inspect knock sensor.
Is knock sensor normal?		 Yes Inspect ignition timing.
No Replace knock sensor.
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

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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.