Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 46 (ENGINE CONTROLS - SELF-DIAGNOSTICS)SYSTEM TESTSIGNITION SCOPE CHECK
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Ignition Scope Check
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Ignition Scope Check
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Fouled plugs or a damaged ignition may cause high catalyst temperatures. Check components next to catalyst and muffler for heat damage.
- Visual Inspection Of Ignition System
Visually inspect the engine compartment to make sure all coils and spark plug wires are properly and securely connected. Examine all wiring harnesses and connectors for damaged, burned or overheated insulation and loose or broken conditions. Ensure battery is fully charged. All accessories must be off during diagnosis. If a problem is indicated, repair as necessary. Complete FUEL OR MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE under MONITOR REPAIR VERIFICATION DRIVE CYCLES under DRIVE CYCLE PROCEDURES. If a problem is not indicated, for diagnosis with engine analyzer, go to next step. For diagnosis without engine analyzer, go to step 10 .NOTE: In order for diagnostic procedures to provide accurate results, it is essential that calibration of the engine analyzer be maintained. Refer to equipment manual for procedure to calibrate engine analyzer. If equipment manual is not available, an estimate of the calibration can be made by connecting Spark Tester (303-D037) or equivalent to a properly operating ignition system and measuring firing voltage of spark tester only. Spark tester firing voltage should be approximately 28KV. - Connect Engine Analyzer
Obtain Engine Analyzer (010-01060) or an equivalent to diagnose concerns in secondary side of ignition system. After engine analyzer is connected to vehicle, go to next step. - Check For Ignition Pattern
Observe pattern on scope while cranking engine. See to Fig 1 . If pattern is flat, which indicates no spark on all cylinders, turn ignition off. Check condition of related fuses/fuse links. If okay, repair open circuit. If fuse/fuse link is damaged, check IGN START/RUN circuit for short to ground. Repair as necessary. Complete FUEL OR MISFIRE MONITOR REPAIR VERIFICATION DRIVE CYCLE under MONITOR REPAIR VERIFICATION DRIVE CYCLES under DRIVE CYCLE PROCEDURES. If pattern is not flat, go to next step.
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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.