Mitsubishi Eclipse II technical information manual page 188

text version of content this owner's manual page from owners manual to the vehicle Mitsubishi Eclipse, year of production 1995 - 1999:

POWER TRAIN- Automatic Transaxle 2-75 TRANSMISSION CONTROL MODULE (TCM) The Transmission Control Module (TCM), is the brain of the transaxle. It receives information from several inputs for making decisions on how the transaxle should function. Some of the information is used only by the TCM, and some of the informa- tion is shared with other components through the CCD bus. The CCD bus is simply a communication link between the TCM and other electronic components on the vehicle. Engine cranking TCM Inputs The TCM uses various inputs to determine when to upshift or downshift and when to engage or disengage the torque converter clutch. The TCM also uses these inputs for continuous feed-back data for controlling shift quality. Without any input, the TCM has no way to determine the state of the transaxle and therefore cannot control its operation as designed. The illustration is a list of the input sensors and signals that the TCM uses to determine control over its outputs. Scan tool Transmission TCM Outputs communicationcontrol relay In order for the TCM to perform, it must have the necessary number of outputs (signals or devices) that cause the transaxle to function as desired. Some of these controlled functions (or outputs) are used by the TCM to cause upshifts or downshifts (clutch control). Other TCM outputs are information signals sent across the CCD bus to another control module. The illustra- tion provides a list of the output signals or devices controlled by the TCM. J Transmission Control Module Operation lar transaxle to optimize vehicle shift quality using The main reason for having the transaxle controlled its program logic. by the TCM is to have superior shift quality. The TCM actually “learns” the characteristics of aparticu- (1) Adaptive Memory memory, through a loss of battery power or the The TCM automatically adapts for engine perfor- disconnection of its60-way connector, it takes mance variations and clutch torque variations to provide consistent shift quality for the life of theapproximately ten shifts for the TCM to re-learn shift characteristics. transaxle. This learning capability is called adaptive memory. If for some reason the TCM loses its (2) Quick Learn test. This will fully utilize the TCM’s adaptive memory A quick-learn procedure is available to pre-program capability. The quick-learn procedure is accessed the shift characteristics into the TCM. Thequick- learn procedure simply speeds up the TCM learningthrough transaxle diagnosis and performed by the Lprocess. The vehicle still must be driven and shiftedscan tool (MUT-II). several times in each gear range during the road

owners manual Mitsubishi Eclipse

owners manual Mitsubishi Eclipse - year of production: 1995, 1996, 1997, 1998, 1999 - Mitsubishi Eclipse II technical information manual EN