No. 5 Engine Stalls-After Start/At Idle [L5]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

5	ENGINE STALLS-AFTER START/AT IDLE
DESCRIPTION	The engine stops unexpectedly.
POSSIBLE CAUSE	A/C system operation is improper Air leakage from intake air system parts Purge solenoid valve malfunction Improper operation of electronic throttle control system EGR valve malfunction No signal from CKP sensor due to sensor, related wiring or wrong installation Vacuum leakage Engine overheating Low engine compression Erratic signal to ignition coil Poor fuel quality PCV valve malfunction Air cleaner restriction Restriction in exhaust system Electrical connector disconnection Open or short circuit in fuel pump body and related wiring harness No battery power supply to PCM or poor ground Inadequate fuel pressure Fuel pump body mechanical malfunction Fuel leakage from fuel injector Fuel injector clogging Ignition coil malfunction Improper air/fuel mixture ratio control Improper valve timing Improper operation of variable valve timing control system Immobilizer system and/or circuit malfunction Immobilizer system operating property. (Ignition is not registered.) Pressure regulator 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this Service Information. (See BEFORE SERVICE PRECAUTION [L5] .) (See AFTER SERVICE PRECAUTION [L5] .) CAUTION: Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

ENGINE STALLS-AFTER START/AT IDLE

DESCRIPTION

The engine stops unexpectedly.

POSSIBLE CAUSE

A/C system operation is improper
Air leakage from intake air system parts
Purge solenoid valve malfunction
Improper operation of electronic throttle control system
EGR valve malfunction
No signal from CKP sensor due to sensor, related wiring or wrong installation
Vacuum leakage
Engine overheating
Low engine compression
Erratic signal to ignition coil
Poor fuel quality
PCV valve malfunction
Air cleaner restriction
Restriction in exhaust system
Electrical connector disconnection
Open or short circuit in fuel pump body and related wiring harness
No battery power supply to PCM or poor ground
Inadequate fuel pressure
Fuel pump body mechanical malfunction
Fuel leakage from fuel injector
Fuel injector clogging
Ignition coil malfunction
Improper air/fuel mixture ratio control
Improper valve timing
Improper operation of variable valve timing control system
Immobilizer system and/or circuit malfunction
Immobilizer system operating property. (Ignition is not registered.)
Pressure regulator 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this Service Information.
  (See BEFORE SERVICE PRECAUTION [L5] .)
  
  (See AFTER SERVICE PRECAUTION [L5] .)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and the quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.