Pinpoint Test S: Transmission Growling/Humming - Noise Occurs In Forward Gears. The Noise Is More Prominent When The Gear Is Loaded. The Problem Gear Can Be Located As The Noise Occurs In A Specific Gear Position
WARNING: This page is about a different variant/trim than selected.
- Normal Operation and Fault Conditions
- Axle howl or whine
- The MT88 transmission may be suspect of a gear whine noise, which seems to be emanating from the front or rear of the vehicle at or in excess of 80 km/h (50 mph) at full operating temperature. Drive the vehicle at customer complaint speeds in 4th gear (this is the direct gear) to eliminate manual transmission as noise source, reach full operating temperature and confirm if noise is still present. If noise is not present, proceed with gear noise analysis.
- If noise is still present, REFER to: Rear Drive Axle and Differential REFER to: Front Drive Axle
- Gear is cracked, chipped, or rough
- Inspect the suspect gear for damage or wear. Install new components as necessary.
Possible Sources
- Damaged or worn gear
- Axle howl or whine
Diagnostic steps are not provided for this symptom or DTC. REFER to: Diagnostic Methods