Mazda 6 Workshop Manual page 227

10 LOW IDLE/STALLS DURING DECELERATION
• Intake-air system restriction or clogging
• Poor fuel quality
• A/C system improper operation
• Inadequate fuel pressure
• Suction control valve malfunction (built-in supply pump)
• Fuel pressure limiter malfunction (built-in common rail)
• Fuel leakage
• Fuel line restriction or clogging
• Fuel filter restriction or clogging
• Incorrect fuel injection timing
• Incorrect idle speed
• Erratic signal from CKP sensor
• Erratic signal from CMP sensor
• Supply pump malfunction
• Fuel injector malfunction
• Low engine compression
• Improper valve timing
• Glow system malfunction
POSSIBLE
• EGR system malfunction
CAUSE
• EGR valve position sensor malfunction
• MAF/IAT sensor or related circuit malfunction
• ECT sensor or related circuit malfunction
• Fuel pressure sensor or related circuit malfunction
• Neutral switch malfunction or related circuit malfunction
• Accelerator position sensor or related circuit malfunction
• Idle switch or related circuit malfunction
• Incorrect adjustment accelerator position sensor and/or idle switch
• IDM or related circuit malfunction
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
• • • • 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 injury or death
and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE
REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.
TROUBLESHOOTING
F2
F2–215