Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

STEP	INSPECTION	RESULTS	ACTION
1	Is a squealing, click or chirping sound present?	Yes	Inspect the followings: Engine oil level Drive belt tension Splash shield or under cover looseness Generator installation
1	Is a squealing, click or chirping sound present?	No	Go to the next step
2	Is a rumbling or grinding noise present?	Yes	Inspect the followings: Drive belt tension
2	Is a rumbling or grinding noise present?	No	Go to the next step.
3	Is a rattling noise present?	Yes	Inspect the rattling location for loose parts.
3	Is a rattling noise present?	No	Go to the next step
4	Is a hissing noise present?	Yes	Inspect the following: Vacuum leakage Spark plug looseness Intake air system leakage
4	Is a hissing noise present?	No	Go to the next step.
5	Is a rapping or roar noise present?	Yes	Inspect for looseness in the following: Dynamic dumper Intake air system Exhaust system
5	Is a rapping or roar noise present?	No	Go to the next step.
6	Is a knocking noise present?	Yes	Go to symptom troubleshooting "No. 13 Knocking/pinging" (See NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [L5] .)
6	Is a knocking noise present?	No	If the noise comes from inside the engine, inspect the tappet noise.
7	Verify test results If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L5] .) If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis If the vehicle is repaired, troubleshooting is completed If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.