Mitsubishi Eclipse II technical information manual page 196

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 2-83 : TRANSMISSION CONTROL MODULE OPERATION LIntroduction What does it do and how does it know? You haveconcentrate on the main logic functions and define the primary input and output requirements. By doing probably asked yourself this question more than this we will be able to use simple block diagrams, once as you pondered some transaxle problems. charts and graphs to illustrate how some of the This is really a very complex question. Just stop decisions are made. We will not cover electronically and think about it for a minute. Think of all the how the actual logic circuits inside the TCM work. electronic logic features that have to be programmed into this small control module so that it will alwaysThe main logic functions, covered in this lesson, know just what clutch to apply and release, at justinclude the Start Routine, Transmission Range and the right time, under all the different driving condi-Park Neutral Position Switch Logic, Shift Lever Posi- tions that could possibly take place. tion Logic, Speed Sensor Logic, Transaxle Tempera- ture, Shift Schedule Logic, Torque Converter EMCC A description of theTCM’s electronic functions can Logic, Shift Selection Logic, Shift Execution Logic, be simplified if we look at them, one main logic Solenoid Switch Valve Control Logic, Clutch Apply function at a time. We will use this “logic function” Status (Clutch Volume Tracking), Normal Shutdown approach to describe in simple terms how the TCM Routine, Fail-Safe Routine. makes some of these complex decisions. We will TCM Routine and Logic Functions Many of the control logic functions discussed insequence. This sequence and the time interval that this section rely on output information from a priorit takes to complete these normal functions is re- logic function as their main input information. Thisferred to as a program loop. A program loop occurs once every 7 milliseconds(.007 seconds). Some should be kept in mind when you are doing your diagnosis. Most of these logic functions are recalcu-special checks or logic functions may be performed more or less frequently. lated and updated on a regular basis and in a specific / Start Routine NOTE Li The first function the TCM performs, when the igni- The ignition switch has been redesigned to allow tion key is turned on, is the Start Routine. This for power up of the TCM, BCM and electronic routine allows the TCM to check critical inputs and PRND2L display. This occurs with the key in the memory circuits before it powers-up the system. column unlock position, just before the ignition run If everything is ok up to and including the switched position. battery tests to the TCM and pressure switches, then the TCM will power-up the transmission controlAny invalid result sets the appropriate diagnostic relay and finish the remaining checks as described below. trouble code, and the system immediately goes into limp-in. The TCM identifies the crank period by the The Start Routine is performed when the ighition switch is turned to the OFF (column unlock) or RUNcrank signal input provided at pin 8. When the crank positions and again when the ignition switch is re-signal is present, the TCM is stopped and isre-initial- ized after cranking to eliminate the possibility of turned to the run position after engine cranking. low cranking voltages or spikes confusing the Cen- tral Processing Unit (CPU). The CPU is a small microprocessor inside the TCM that contains thou- sands of transistors and diodes on a chip of silicone small enough to fit on the tip of your finger.

owners manual Mitsubishi Eclipse

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