Mazda Mazda6 Workshop Manual Supplement page 350

STEP
24 Is engine compression correct?
(See B2–8 COMPRESSION
25 Inspect fuel injector.
(See F2–56 FUEL INJECTOR
Is fuel injector okay?
26 Inspect IDM.
(See F2–84 INJECTOR DRIVER MODULE
(IDM) INSPECTION)
Is IDM okay?
27 Inspect timing belt for following:
• Chipping of gear teeth
• Low tension
• Breakage damage or cracks
Is timing belt okay?
28 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM. (See
End Of Sie
F2–198
TROUBLESHOOTING
INSPECTION
INSPECTION)
INSPECTION)
RESULTS
Yes Go to next step.
No Inspect for following:
• Damaged valve seat
• Worn valve stem and valve guide
• Worn or stuck piston ring
• Worn piston, piston ring or cylinder
• Improper valve timing
Service as necessary.
Yes Go to next step.
No Repair or replace as necessary.
Yes Go to next step.
No Repair or replace as necessary.
Yes Inspect following:
• Clutch slippage
• CKP sensor
• Boost sensor and related circuit
• Brake system for dragging
If okay, remove and inspect supply pump and common
rail.
No If valve timing is incorrect, adjust valve timing.
If timing belt is not okay, replace timing belt.
F2–64 PCM REMOVAL/INSTALLATION)
ACTION