Mazda 3 Workshop Manual page 481

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Erratic signal from CKP sensor
• Low engine compression
• Vacuum leakage
• Poor fuel quality
• Main relay intermittent malfunction
• Throttle body malfunction
• Engine overheating
• Spark plug malfunction
• Improper air/fuel mixture ratio control operation
• Improper variable tumble control operation
• Erratic signal to ignition coil
• Air cleaner restriction
• PCV valve malfunction
• Fuel flow into evaporative purge hose
• Improper valve timing due to jumping out timing belt
• Restriction in exhaust system
• Intermittent open or short circuit in fuel body pump circuit
• Inadequate fuel pressure
• Fuel pump mechanical malfunction
• Check valve (two-way) malfunction (integrated with fuel tank)
• Fuel leakage from fuel injector
• Fuel injector clogging
• Fuel line restriction or clogging
• Pressure regulator malfunction (built-in fuel pump unit)
• TP sensor misadjustment
• Intermittent open or short circuit of MAF sensor, TP sensor and VSS
• ATX malfunction (ATX)
• Clutch slippage (MTX)
• Loose attaching bolts or worn engine mounts.
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
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Warning
• Fuel vapor is hazardous. It can easily ignite, causing serious injury and
damage. Always keep sparks and flames away from fuel.
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious
injuries or death and damage. Fuel can also irritate skin and eyes. To prevent
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