Note:
- Malfunctions occurring in the gearbox may be related to either the engine, or the control system, or the gearbox itself. Therefore, before starting the check, it is necessary to determine the area of their occurrence.
- Troubleshooting should begin with the simplest operations and proceed in order of increasing complexity.
1. Perform tire pressure checks and other preliminary checks.
2. Check gear shifting If gear shifting is normal, check the electrical part of the control system.
3. Perform the following checks:
a) Checking the engine and torque converter on a fully braked vehicle.
b) Road test. Make sure that the fault is related to the gearbox itself. If there is noise or vibration, possible sources may be the compressor, engine, drive shafts, tires, etc.
c) Hydraulic tests. Measure the pressure in the lines and perform a general check of the working fluid supply circuits.
d) Checking the gear engagement time. Checking the wear of the gearbox parts (locking clutches, brakes and planetary gears).