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 for the followings Engine oil level Drive belt tension Splash shield or under cover looseness Generator installation (alignment)
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 for the followings: Drive belt tension P/S fluid level
2	Is a rumbling or grinding noise present?	No	Go to the next step
3	Is a rattling noise present?	Yes	Inspect 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 for 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 looseness for followings 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 [MZI-3.7] .)
6	Is a knocking noise present?	No	If the noise comes from the engine internal, inspect for friction gear, timing chain or MLA noise.
7	Verify test results If normal, return to diagnostic index to service any additional symptoms (See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] .) If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis If vehicle is repaired, troubleshooting completed If vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available Retest