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owners manual Mitsubishi Eclipse
owners manual Mitsubishi Eclipse - year of production: 1995, 1996, 1997, 1998, 1999 - Mitsubishi Eclipse II technical information manual EN
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from owners manual to the vehicle Mitsubishi Eclipse, year of production 1995 - 1999:
POWER TRAIN- Automatic Transaxle
SLP T42 T41 TO1 TO3 Shift Lever Position (SLP) Logic
P CL CL OP OP The primary function of SLP logic is to provide safe, continuous,
R but limited operation of the transaxle with the presence of
OP OP CL CL
N OP CL CLOP an invalid or transition input code. The SLP logic function
D OP screens the input codes from the switches and provides an
OP OP CL
2 OP OP CLOP SLP output signal to control actual gear selection.
Inputs include the codes indicated by the transmission range
L CLOP OP OP and park neutral position switches, current shift lever position,
Tl OPCL OP OP pressure switch indications, and speed ratio data from the
T2 OPOP OP OP input and output speed sensors.
Shift Lever Position output becomes the“PRND2L”module logic is identical in Park and Neutral (same
input to most of the other functions.hydraulic porting).
The R, P, N,Tl and ‘73” PRND2L codes are always
NOTE
accepted by the SLP logic as being valid and are
always converted directly to R, N or “D” SLP codes. An incorrect input (for example, a defective switch)
of one of these positions could, with sufficient time,
This is done because these codes can only occur
result in either a pressure switch or speed check
when the corresponding Reverse, Neutral or Drive
fault, when in fact the real cause is a transmission
manual valve porting is established. This improves
range or park neutral position switch error. This
the response time necessary for garage shifts (Re-
verse - Neutral - ‘ID”). type of fault can occur, for example, when the manual
SLP output with 2, L, T2 and Tl codes is basedvalve porting is in reverse but the code is indicating
“D”. In this case, the low/reverse pressure switch
onthe current SLP position as well as current pres-
sure switch and speed ratio data. The pressuredata and input speed data will not agree with the
expected results for Shift Lever Position= 73”.
switch and speed ratio data are monitored to identify
NOTE
which hydraulic mode of operation exists (reverse,
It is extremely important that accurate shift lever
neutral or drive) so that the appropriate selection
is made for Shift Lever Position.position data be available to the TCM. The accuracy
NOTE of any diagnostic trouble code found in memory
is doubtful unless the Shift Lever Test, performed
To help clarify the SLP table, keep in mind that
SLP logic only uses N because transmission controlon the scan tool (MUT-II), passes without fail.
by holding the shift lever mid-way between‘ID” and
On some vehicles it may be possible to cause pres-
Neutral.
sure switch or speed check diagnostic trouble codes
Speed Sensor Logic
to distinguish between a failure of the crankshaft
Speed and acceleration calculations provide critical
position sensor or distributor pulse input through
input information to the logic functions within the
the circuits versus an actual engine stall or key
TCM. Speed sensor logic determines gear selection,
shift timing and shift quality. This information is usedon engine off condition.
Input speed data from the input speed sensor is
as input to the shift schedule, shift logic selection
and shift logic execution functions, programmed intocalculated by the TCM. The data is based on the
the TCM. number of teeth and time between each tooth since
the last main program loop. Input acceleration is
There are four important input values that must
calculated from the change in torque converter input
be calculated; engine speed, input speed, input ac-
celeration, and output speed. speed over time.
The TCM receives a direct engine speed signalOutput shaft speed data from the output speed sen-
sor is calculated based on the number of teeth and
from the crankshaft position sensor or distributor
the time between each tooth since the last main
depending on the vehicle and engine used. Engine
program loop.
speed is calculated and updated with each sensor
pulse. The TCM also receives an engine speedSpeed information is also used to verify that steady
state in-gear operation is normal. Output shaft speed
signal from the PCM over the CCD bus. Immediate
times current gear ratio is continually checked
direct input of engine speed is needed for proper
against input speed in order to identify the occur-
transaxle operation. It cannot be provided by the
rence of an input or output speed sensor failure
engine speed signal from the PCM over the bus.
or a clutch that is slipping.
However, both “engine run” signals allow the TCM
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year of production from: 1995
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Mitsubishi Eclipse II technical information manual
pages 195 - 201
Mitsubishi Eclipse II technical information manual
page 198 / 381
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