Diagnostic procedure

ENGINE NOISE - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Is squeal, click or chirp sound present?	Yes	Inspect engine oil level or drive belts.
1	Is squeal, click or chirp sound present?	No	Go to next step.
2	Is rumble or grind sound present?	Yes	Inspect drive belt.
2	Is rumble or grind sound present?	No	Go to next step.
3	Is rattle sound present?	Yes	Inspect location of rattle for loose parts.
3	Is rattle sound present?	No	Go to next step.
4	Is hiss sound present?	Yes	Inspect for following: Vacuum leakage Spark plug loose Intake-air system leakage
4	Is hiss sound present?	No	Go to next step.
5	Is rap or roar sound present?	Yes	Inspect exhaust system for loose parts.
5	Is rap or roar sound present?	No	Go to next step.
6	Is knock sound present?	Yes	Go to symptom troubleshooting in NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE .
6	Is knock sound present?	No	If noise comes from engine internal, inspect for friction gear or HLA noise.
7	Verify test results. If okay, return to diagnostic index to service any additional symptoms. 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, replace or reprogram PCM.