No. 6 Cranks Normally But Will Not Start [MZI-3.7]: 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.

DESCRIPTION AND POSSIBLE CAUSE

6	CRANKS NORMALLY BUT WILL NOT START
DESCRIPTION	The starter cranks engine at normal speed but the engine will not run. Refer to symptom troubleshooting "No 5 Engine stalls" if this symptom appears after engine stall. Fuel is in tank. Battery is in normal condition
POSSIBLE CAUSE	No battery power supply to PCM Air leakage from intake-air system Open PCM GND or vehicle body GND Improper operation of electronic throttle control system 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 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 Immobilizer system operating properly. (Ignition key is not registered.) Pressure regulator malfunction (built-in fuel pump unit) WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: 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 [MZI-3.7] .) (See AFTER SERVICE PRECAUTION [MZI-3.7] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

CRANKS NORMALLY BUT WILL NOT START

DESCRIPTION

The starter cranks engine at normal speed but the engine will not run.
Refer to symptom troubleshooting "No 5 Engine stalls" if this symptom appears after engine stall.
Fuel is in tank.
Battery is in normal condition

POSSIBLE CAUSE

No battery power supply to PCM
Air leakage from intake-air system
Open PCM GND or vehicle body GND
Improper operation of electronic throttle control system
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
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
Immobilizer system operating properly. (Ignition key is not registered.)
Pressure regulator malfunction (built-in fuel pump unit)
WARNING:
The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system:
- 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 [MZI-3.7] .)
  
  (See AFTER SERVICE PRECAUTION [MZI-3.7] .)
CAUTION:
- Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.