No.6 Cranks Normally But Will Not Start - Mazda 6 2002 Workshop Manual

NO.6 CRANKS NORMALLY BUT WILL NOT START

6 CRANKS NORMALLY BUT WILL NOT START
• Starter cranks engine at normal speed but engine will not run.
• Refer to symptom troubleshooting "No.5 Engine stalls" if this symptom appears after engine stall.
DESCRIPTION
• Fuel is in tank.
• Battery is in normal condition.
• No battery power supply to PCM
• Air leakage from intake-air system
• Open PCM GND or vehicle body GND
• Improper operation of IAC valve
• EGR valve malfunction
• 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
• Spark leakage from high-tension leads
• Improper air/fuel miture ratio control
• Poor fuel quality
• PCV valve malfunction
• Air cleaner restriction
• Restriction in ehaust system
• Disconnected electrical connector
• Open or short circuit in fuel pump body and related harness
• Inadequate fuel pressure
• Fuel pump mechanical malfunction
• Fuel leakage from injector
• Fuel injector is clogged.
• Purge solenoid valve malfunction
POSSIBLE CAUSE
• Spark plug malfunction
• Ignition coil malfunction
• Improper variable valve timing control system operation (L3)
• Improper valve timing
• Immobilizer system (PATS) and/or circuit malfunction (if equipped)
• 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
• • • • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or
Caution
• • • • Disconnecting/connecting quick release connector without cleaning it may possibly cause
Diagnostic procedure
STEP INSPECTION
1 Note
• Following test should be performed for
vehicles with immobilizer system. Go to
Step 10 for vehicles without immobilizer
system.
Connect WDS or equivalent to DLC-2.
Do any of following conditions appear?
• Engine is not completely started.
• DTC B1681 is displayed.
2 Does engine stall after appro. 2 seconds since
engine is started?
TROUBLESHOOTING
keep sparks and flames away from fuel.
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 F–17 BEFORE REPAIR
(See F–17 AFTER REPAIR
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.
PROCEDURE.)
PROCEDURE.)
RESULTS
Yes Both conditions appear:
Go to Step 3.
No Either or other condition appears:
Go to net step.
Yes Go to net step.
No Immobilizer system is okay.
Go to Step 10.
A6E398018881W08
ACTION
F–195
F