Mazda Mazda6 Workshop Manual Supplement page 333

STEP INSPECTION
28 Inspect IDM.
(See F2–84 INJECTOR DRIVER MODULE
(IDM) INSPECTION)
Is IDM okay?
29 Inspect EGR system operation.
Is EGR system operation normal?
30 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM. (See
End Of Sie
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 fuel tank.
• Battery is in normal condition.
• Poor fuel quality
• Intake-air system restriction
• Fuel line restriction
• EGR system malfunction
• Glow system malfunction
• Fuel pressure sensor or related circuit malfunction
• Suction control valve malfunction (built-in supply pump)
• Fuel pressure limiter malfunction (built-in common rail)
• Fuel leakage
• Fuel filter clogging
• Incorrect fuel injection timing
• Erratic signal from CKP sensor
• Erratic signal from CMP sensor
• V-reference supply circuit malfunction
• ECT sensor or related circuit malfunction
POSSIBLE
• Supply pump malfunction
CAUSE
• Fuel injector malfunction
• Immobilizer system (PATS) and/or circuit malfunction (if equipped)
• Low engine compression
• Improper valve timing
• IDM or related circuit malfunction
• PCM control repay 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.
Diagnostic Procedure
STEP INSPECTION
1 Note
• The following test should be perform for
vehicles with immobilizer system. Go to
Step 10 for vehicles without immobilizer
system.
Connect WDS or equivalent to DLC-2.
Do following conditions appear?
• Engine is not completely started.
• DTC B1681 is displayed.
2 Is coil connector securely connected to coil?
TROUBLESHOOTING
RESULTS
Yes Go to next step.
No Repair or replace as necessary.
Yes Remove and inspect supply pump and common rail.
No Repair or replace malfunctioning part according to
EGR system operation results.
F2–64 PCM REMOVAL/INSTALLATION)
RESULTS
Yes Both conditions appear:
Go to Step 4.
No Either or other condition appears:
Go to next step.
Yes Go to next step.
No Connect coil connector securely.
Return to Step 1.
ACTION
A6E408018881208
ACTION
F2–181
F2