Mazda 6 2002 - No.21 Engine Noise

TROUBLESHOOTING
F219
F
End Of Sie
NO.21 ENGINE NOISE
A6E398018881W23
Diagnostic procedure
End Of Sie
4 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
Are there any DTCs displayed?
Yes DTC is displayed:
Go to appropriate DTC test.
No No DTC is displayed:
Inspect charcoal canister for fuel saturation.
If excess amount of liquid fuel is present, replace
charcoal canister.
5 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.
STEP INSPECTION RESULTS ACTION
21 ENGINE NOISE
DESCRIPTION Engine noise from under hood
POSSIBLE CAUSE
Squeal, click or chirp noise:
• Improper engine oil level
• Improper drive belt tension
Rattle sound noise:
• Loose parts
Hiss sound noise:
• Vacuum leakage
• Loose spark plug
• Air leakage from intake-air system
• Improper variable air duct (VAD) control system operation
Rumble or grind noise:
• Improper drive belt tension
Rap or roar sound noise:
• Exhaust system looseness
Other noise:
• Camshaft friction gear noise or MLA noise
• Timing chain noise
STEP INSPECTION RESULTS ACTION
1 Is squeal, click or chirp sound present? Yes Inspect engine oil level or drive belts.
No Go to next step.
2 Is rumble or grind sound present? Yes Inspect drive belts.
No Go to next step.
3 Is rattle sound present? Yes Inspect location of rattle for loose parts.
No Go to next step.
4 Is hiss sound present? Yes Inspect for following:
• Vacuum leakage
• Spark plug looseness
• Intake-air system leakage
• Variable air duct (VAD) control system operation
(See F238 Variable Air Duct (VAD) Control System
Operation Inspection (L3 Engine Models).)
No Go to next step.
5 Is rap or roar sound present? Yes Inspect exhaust system for loose parts.
No Go to next step.
6 Is knock sound present? Yes Go to symptom troubleshooting "No.11 Knocking/
pinging".
No If noise comes from engine internal, inspect for friction
gear, timing chain or MLA noise.
7 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM.