Mazda 3 Workshop Manual page 511

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Camshaft friction gear noise or MLA noise
• Timing chain noise
Diagnostic procedure
STEP INSPECTION
Is a squealing, click or
1
chirping sound present?
Is a rumbling or grinding
2
sound present?
3 Is a rattling sound present?
4 Is a hissing sound present?
Is a rapping or roaring sound
5
present?
6 Is a knocking sound present?
Verify test results.
7
• If normal, return to diagnostic index to service any additional symptoms.
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RESULTS
Inspect for following:
• Engine oil
• Drive belt tension
Yes
• Splash shield or under cover looseness
• Generator installation (alignment)
No Go to the next step.
Yes Inspect drive belts.
No Go to the next step.
Yes Inspect rattling location for loose parts.
No Go to the next step.
Inspect for the following:
• Vacuum leakage
Yes
• Spark plug looseness
• Intake-air system leakage
No Go to the next step.
Inspect the following for looseness:
• Dynamic chamber
Yes
• Intake-air system
• Exhaust system
No Go to the next step.
Go to symptom troubleshooting "No.11
Knocking/pinging".
Yes
(See
ACCELERATION/CRUISE
If noise comes from engine internal, inspect for friction
No
gear, timing chain or MLA noise.
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ACTION
NO.13 KNOCKING/PINGING-
[Z6].)
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