Mitsubishi Eclipse II technical information manual page 208

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 2-95 Normal Shutdown Routine ply. If the TCM is disconnected, the “Keep Alive When the ignition switch is turned off (column lock, Memory” will be lost. This memory is where d/agnos- ikey out position), the TCM will go through a specific shutdown routine. tic trouble codes and other learned values are For the first twenty minutes after ignition off, thestored. These values may be clutch apply and re- CPU remains in the “awake” mode. In tills off-timelease rates and clutch fill volumes. If the TCM is disconnected from its direct battery voltage supply, tracking mode, the TCM continues to perform certain functions such as predicting fluid temperature cal-initial stored values are substituted for the erased culations. learned values when the CPU is re-initialized. These values will then be updated as new values are Longer off-time tracking is currently prohibited due learned when operating the transaxle. to battery drain concerns since the CPU remains powered up during this time. A code 12 will also be stored on any initialization following a direct battery feed disconnection. Code After 20 minutes have elapsed, the CPU will switch 12 lets you know that a direct battery disconnection into a Sleep mode. In this mode the TCM does has occurred. not perform any functions and its Keep Alive Memory uses only a very small amount of current. The TCM uses a “Keep Alive Memory” that must always remain connected to the battery voltage sup- Fail-Safe Routine result in changes in clutch pressures, pressure The TCM is designed and programmed with what is called a fail-safe routine. This routine constantlyswitch states and input speeds. These changes become the new input. If they are not as desired, monitors and checks all input and control features then the solenoid output is adjusted accordingly. for normal operation. The TCM uses inputs from This feed-back control is referred to as a closed the PCM, transmission range and park neutral loop system and is an integral part of fail-safe. switches, input and output speed signals, throttle position, ignition and pressure switches to determine NOTE the desired outputs. The primary outputs are to ii The purpose of this section is to cover fail-safe the four solenoid valves which control the transaxle logic. Refer to the Fault Code Explanation section clutches. Changes in these solenoid outputs can for diagnostic information and probable causes. The actual shutdown sequence to second Gear be- When a failure has been identified which prevents gins once the vehicle speed drops below 45 mph. continued safe transaxle operation, the TCM eventu- The exception to this rule is when the vehicle is ally goes into limp-in by turning off all of the sole- at high speed and develops a solenoid circuit error. noids. This provides for shift lever controlled opera- If this occurs, a temporary “neutral” state is gener- tion of SECOND GEAR, NEUTRAL, REVERSE, and PARK. The TCM has logic to ensure the limp-in ated by venting all clutches to avoid incorrect clutch combinations - see Codes 41 to 44. results in an ORDERLY SHUTDOWN. Certain fail- ures will prevent an orderly shutdown, and an IM-The shutdown sequence reduces the possibility of MEDIATE SHUTDOWN will occur. having engine flare-up or clutch overlap (three clutches applied) as the transaxle defaults to second Orderly Shutdown -A Shutdown routine is activated gear. This is accomplished by releasing the non with certain failures prior to opening the transmission control relay. The result of an orderly shutdown issecond gear clutches slightly before the transmis- sion control relay is opened. This will occur when dependent on the operating condition at the time the throttle angle is less than approximately l/3 of the failure. If the transaxle is in Park, Reverse, full open. At greater throttle angles, the transmission Neutral, or Second Gear, there is no additional action control relay is immediately opened. This is done needed by the TCM. The transmission control relay because second gear clutches typically apply faster is opened immediately because the power off state than the non second gear clutches. Again, the pur- of the transaxle has already been achieved. pose for this sequence of events is to prevent more If the transaxle is in first gear, then the shutdown than the correct number of clutches from being ap- sequence (default to second gear) begins immedi- ately. plied at the same time during moderate throttle If the transaxle is in third or fourth Gear above 45angles and to prevent engine flare at higher throttle openings. b mph, then the current gear range is maintained to prevent the possibility of causing high engine rpm and/or engine braking.

owners manual Mitsubishi Eclipse

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