Mazda 3 Workshop Manual page 462

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
6
• The starter cranks the engine at normal speed but the engine will not run.
• Refer to symptom troubleshooting "No.5 Engine stalls" if this symptom appears after
the engine stall.
DESCRIPTION
• Fuel is in the tank.
• The battery is in normal condition.
• No battery power supply to PCM
• Air leakage from intake-air system
• Open PCM GND or vehicle body GND
• Improper operation of IAC valve
• EGR valve malfunction
• No signal from CKP sensor due to sensor, related wire or incorrect installation
• No signal from CMP sensor due to sensor, related wire or incorrect installation
• Low engine compression
• Engine overheating
• Vacuum leakage
• Erratic signal to ignition coil
• Improper air/fuel mixture ratio control
• Poor fuel quality
• PCV valve malfunction
• Restriction in intake-air system
POSSIBLE
CAUSE
• Restriction in exhaust system
• Disconnected electrical connector
• Open or short circuit in fuel pump body and related wiring harness
• Inadequate fuel pressure
• Fuel pump mechanical malfunction
• Fuel leakage from injector
• Fuel injector is clogged.
• Purge solenoid valve malfunction
• Spark plug malfunction
• Ignition coil malfunction
• Improper variable valve timing control system operation
• Improper valve timing
• Immobilizer system and/or circuit malfunction (if equipped)
• Immobilizer system operating properly. (Ignition key is not registered.)
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