Electronic Systems of an Automatic Transmission
Speed Sensors The vehicle speed sensor is a device that is mounted on the output shaft of the transmission or transaxle. This device tells the electronic control module (ECM) how…
Automatic Transmission Service
Automatic transmission service can be easily divided into the following areas: preventive maintenance, troubleshooting, and major overhaul. Before you perform maintenance or repair on an automatic transmission, consult the maintenance…
Hydraulic System of an Automatic Transmission
The hydraulic system of an automatic transmission serves four basic purposes: 1. Actuates clutches and brake bands by hydraulic pressure from the hydraulic slave circuits. 2. Controls the shifting pattern…
Overrunning Clutch
An overrunning clutch is used in automatic transmissions to lock a planetary gearset to the transmission case so that it can act as a reactionary member. The overrunning clutch for…
Clutches and Bands
Automatic transmission clutches and bands are friction devices that drive or lock planetary gearsets members. They are used to cause the gearset to transfer power. Multiple-Disc Clutch The multiple-disc clutch…
Planetary Gearsets
A planetary gearset consists of three members--sun gear, ring gear, and planetary carrier, which hold the planetary gears in proper relation with the sun and ring gear (Figure 10-18). The…
Torque Converters
The torque converter is a fluid clutch that performs the same basic function as a manual transmission dry friction clutch (Figure 10-16). It provides a means of uncoupling the engine…
Automatic Transmissions
The automatic transmission, like the manual transmission, is designed to match the load requirements of the vehicle to the power and speed range of the engine (Figure 10-15). The automatic…
Transmission Overhaul
Because of the variations in construction of transmissions, always refer to the manufacturer’s service manual for proper procedures in the removal, disassembly, repair, assembly, and installation. The time to carry…
Transmission Troubleshooting
Transmissions are designed to last for the life of the vehicle when lubricated and operated properly. The most common cause of failure results from shifting when the vehicle is not…
