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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (ENGINE CONTROLS [SELF-DIAGNOSTICS 2.3L])DIAGNOSTIC TESTSDTC P0300: RANDOM MISFIRE DETECTIONDETECTION CONDITION
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Detection Condition

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Detection Condition
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

PCM monitors Crankshaft Position (CKP) sensor input signal interval time. PCM calculates change of interval time for each cylinder. If change of interval time exceeds preprogrammed criteria, PCM detects a misfire in corresponding cylinder. While engine is running, PCM counts number of misfires that occurred at 200 crankshaft revolutions and 1000 crankshaft revolutions and calculates misfire ratio for each crankshaft revolution. If ratio exceeds preprogrammed criteria, PCM determines misfire, which can damage catalytic converter or affect emission performance, has occurred. This is a Continuous Monitor (MISFIRE). MIL illuminates if PCM detects misfire which affects emission performance in two consecutive drive cycles or in one drive cycle while DTC for same malfunction has been stored in PCM. PENDING CODE is available if PCM detects misfire which affects emission performance during first drive cycle. MIL flashes if PCM detects misfire, which can damage catalytic converter, during first drive cycle. Therefore, PENDING CODE is not available while MIL flashes. FREEZE FRAME DATA is available. DTC is stored in PCM memory.

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.