Other information:
Circuit Diagram
[Audio]
[Audio + Bluetooth]
[Audio + Bluetooth + Voice]
[Trip]
[Trip + ACC]
[Trip + ACC + Speed Limiter]
[Trip + SCC]
...
Troubleshooting
Symptoms
Suspect area
Remedy
Engine misfire with abnormal internal lower engine noises.
Worn crankshaft bearings
Loose or out of specification engine flywheel
Replace the crankshaft and ...