No. 6 Cranks Normally But Will Not Start: Notes

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DESCRIPTION & POSSIBLE CAUSE

6	Cranks normally but will not start
DESCRIPTION	Starter cranks engine at normal speed but engine will not run. Refer to symptom troubleshooting "NO. 5 ENGINE STALLS -- AFTER START/AT IDLE " if this symptom appears after engine stall. Fuel 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 EGR valve malfunction No signal from CKP sensor due to sensor or related wire No signal from CMP sensor due to sensor or related wire Low engine compression Vacuum leakage Spark leakage from high-tension leads Poor fuel quality PCV valve malfunction Air cleaner restriction Restriction in exhaust system Disconnected electrical connector Open or short circuit in fuel pump and related harness Inadequate fuel pressure Fuel pump mechanical malfunction Fuel leakage from injector Fuel injector clogging Purge solenoid valve malfunction Ignition coil malfunction Improper air/fuel ratio control Improper valve timing Improper operation of variable valve timing control system Immobilizer system (PATS) and/or circuit malfunction 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE .) (See AFTER REPAIR PROCEDURE .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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

Starter cranks engine at normal speed but engine will not run.
Refer to symptom troubleshooting "NO. 5 ENGINE STALLS -- AFTER START/AT IDLE " if this symptom appears after engine stall.
Fuel 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
EGR valve malfunction
No signal from CKP sensor due to sensor or related wire
No signal from CMP sensor due to sensor or related wire
Low engine compression
Vacuum leakage
Spark leakage from high-tension leads
Poor fuel quality
PCV valve malfunction
Air cleaner restriction
Restriction in exhaust system
Disconnected electrical connector
Open or short circuit in fuel pump and related harness
Inadequate fuel pressure
Fuel pump mechanical malfunction
Fuel leakage from injector
Fuel injector clogging
Purge solenoid valve malfunction
Ignition coil malfunction
Improper air/fuel ratio control
Improper valve timing
Improper operation of variable valve timing control system
Immobilizer system (PATS) and/or circuit malfunction
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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual.
  (See BEFORE REPAIR PROCEDURE .)
  
  (See AFTER REPAIR PROCEDURE .)

CAUTION:

Disconnecting/connecting quick release connector without cleaning it may possibly 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.