turn signal MITSUBISHI ECLIPSE 1990 Owner's Manual

-.. ._. .-.._ _
14-68FUEL SYSTEM - Auto-cruise Control System
ACCELERATOR PEDAL SWITCH OFF FUNCTION
The accelerator pedal switch senses the operating
condition of the accelerator pedal.
This function turns OFF the accelerator pedal switchin the auto-cruise control mode during which the
accelerator pedal is
inoperative (accelerator pedal
switch ON).In the auto-cruise control mode, the control
UP;+microcomputer outputs an ON signal (HIGH)
c,stantly, causing transistor
Tr, to be turned ON.
At this time, transistor
Tr2 turns OFF, causing ON
signal I from
.the A/r control unit to be shut off,
which results in the accelerator pedal switch being
turned OFF.
Ignition switch IG7
Ancontrol unitn-l
‘.
INot in operation 1 OFF 1 ON 1Accelerator
pedal switch
(depressed: OFF)uto-cruise control
unit
V
Cruise control ON
Cruise control OFF
mm&m07AoQ10

FUEL SYSTEM- Auto-cruise Control System14-69
ni2nnncisv,“y’I”“.-
connectorDiagnosis Display Patterns and Codes
SELF-D’IAGNOSIS AND INPUT-CHECK FUNC-
TIONSSELF-DIAGNOSIS
When there is a cancellation of the auto-cruise control system
operation not intentionally made by the driver, it is possible to
determine which circuit or what operation caused the cancella-
tion of the auto-cruise control system by following procedures,
(1) Stop the vehicle with the ignition switch and MAIN switch
in the ON position.
NOTETurning OFF either the ignition switch or MAIN switch
erases the diagnosis data. Be sure to keep the ignition
switch and MAIN switch in the ON position until you finish
the inspection.
(2) Connect a voltmeter to the diagnosis connector of the
junction block and read the output code.
(3) Check the output code against the following table to isolate
the cause for cancellation of the auto-cruise control mode.
Output codes
Display
patterns
2 sec.
1.5 sec.I0.5 sec.3sec. id 3 sec.
L3o-l
-Jdrec.
Probable cause
Abnormal condition of actuator clutch coil drive system
Abnormal condition of vehicle speed signal system
tow-speed limiter activation
(The system is normal if it can be
reset.1
n
Automatic cancellation activated by vehicle speed reduction
(The system is normal if it can be reset.)
Control switch malfunction (when SET and RESUME
switches switched ON simultaneously)
Cancel switch ON signal input (stop light
switch, clutch
switch. or inhibitor switch input wiring damage ordisconnection or,occurrence of abnormality in circuitwithin control unit

14-70
-_FUEL SYSTEM
- Auto-cruise Control System
Display when vehicle speed is approximately
20 km/h (12 mph) or higher, or before the
auto-cruise conrrol system is set
12AolO
NOTE1. Codes indicated by thel symbol are displayed, if
tt-conditions are satisfied, even if the system is normal.
I,.either case, the system is normal if it can be reset.
2. Diagnosis codes are displayed when, after cancellation of
the auto-cruise control system, the vehicle speed de-
creases to less than approximately 20 km/h (12 mph), and
are erased by switching OFF the ignition switch or the
MAIN switch. After the diagnosis codes in the memory are
erased, if (when the power supply of the electronic control
unit is switched ON once again) the power supply of the
electronic control unit is normal, continuous ON/OFF
signals will be displayed at
O.&second intervals, regardless
of whether the system condition is normal or not. (Refer to
the illustration at the left.)
INPUT-CHECK FUNCTION
The input-check function allows you to check if the input signal
is normal when a cruise control failure occurs, including the
situation where the cruise control cannot be set.
(1) Connect a voltmeter to the diagnosis connector of the
junction block.
(2) Operate the SET and RESUME switches simultaneously.
(3) Turn ON the ignition switch; the input check can now be
carried out. Perform the corresponding input operations to
read the output codes.
Output codes
Display patternsInput
operationCheck resultst
y- 0.5sec.
n
SET switch ONSET switch circuitis normal.RESUME switch circuit
is normal.
Each cancel switch ON1. Stop light switch
(brake pedal depressed)2. Clutch switch
(clutch pedal depressed)3. Inhibitor switch ON
(shift lever to “N” position)Each cancel switch
circuit is normal.
Driving at approx. 40 km/h
(25mph) or higherWhen both No. 24 andNo. 25 can be con-firmed, vehicle speed
sensor circuit is
normal.Driving at less than approx. 40
km/h (25
mph). or stopped
NOTE1.If two or more input operations are performed at the same time and the microcomputer receives the corresponding
signals, their output codes are indicated repeatedly in code number order as long as the corresponding signals are
2.input.If the input operation is canceled while the output code is being indicated, the code continued to be indicated until it
completes a display cycle. If the code does not disappear, the switch or harness is probably defective.

14-74
_ ,.-..FUEL SYSTEM
- Auto-cruise Control System
When Canceled by the Stop Light Switch (broad
solid-line arrows)
The stop light switch is a four-pole type that
integrates the switch for the stop light (NO) with
that for the auto-cruise control (NC).
When the brake pedal is depressed, the contacts forthe auto-cruise control (NC) open, cutting off the
circuit to energize the electromagnetic clutch coil.
At the same time, the contacts for the stop light
(NO) close to allow a cancel signal to be input from
the
12-V power supply of the control unit to the
cancel circuit and to the microcomputer. As a result,the transistor which energizes the actuator electro-
magnetic clutch coil turns OFF and the electro-
magnetic clutch coil grounding circuit is cut off, thus
canceling the auto-cruise control mode.
When Canceled by the Clutch Switch (thin
solid-line arrows)
When the clutch pedal is depressed, the clutch
switch is turned ON and the battery voltage is
applied to the cancel circuit of the control unit. then,a cancel signal is input to the microcomputer.
causing the transistor that energizes the actuator
electromagnetic clutch coil to turn OFF. This results
in the electromagnetic clutch coil grounding circuit
bma$ndge cut off, which cancels the auto-cruise control
When Canceled by the Selector Lever (position“N”) (dotted-line arrows)
When the transaxle control selector lever is placed
in the “N” (neutral) position, the inhibitor switch is
turned ON and, as a result, current flows from the
control unit to the inhibitor switch, starter, and
ground. Then, a cancel signal is input from the
cancel circuit to the control unit, causing the
transistor which energizes the actuator electro-
magnetic clutch coil to be turned OFF. As a result,
the electromagnetic clutch coil grounding circuit is
cut off and the auto-cruise control mode is canceled.Although a small current (voltage 5 V) flows through
the starter, it is not activated.
MAIN switchLIMIT SWITCH
The function of the limit switch is to shut off the flow of current
to the motor and apply an electric brake to quickly stop the
motor if the throttle valve becomes either fully open or fully
closed, thus preventing problems which might be caused by an
overload of the motor.
The illustration at left shows the condition of the limit switch
when the throttle valve is fully closed, indicating that
.limitswitch
(1) is in the OFF and the RELEASE circuit is being
deenergized.
IAutocruisecontrol unit
07Aool'
.-

_-.-, ._ u .-, 4. ::; bt-i 3,. F-7__ . ._,_ _ ” -- --.-....
FUEL SYSTEM- Auto-cruise Control System14-75INTERMEDIATE LINKS
Intermediate
iink A(accelerator pedal side)Accelerator cable
A
(accelerator pedal side)
03AO224During Auto-cruise Control Driving
The rotation of the selector causes intermediate link
B to turn
which opens and closes the throttle valve. However, intermedi-
ate link A is not operated and accelerator cable A does not
move, so the accelerator pedal remains stationary in its original
position.During Normal Driving
When the accelerator pedal is operated, the rotation of
intermediate link A, which is connected to accelerator cable A
(accelerator pedal side), causes intermediate link
B to turn, and
accelerator cable
B, which is connected to intermediate link B,then opens and closes the throttle valve.
N
0
s -?s
*=Auto-cruise
control unit
13AOO62Vehicle speed
sensor07Aml
VEHICLE SPEED SENSORThe vehicle speed sensor functions to send pulse signals
[which are proportional to the rotation speed (vehicle speed) of
the transaxle’s output gear] to the control unit. The vehicle
speed sensor is installed within the speedometer.
The vehicle speed sensor is the reed switch type; it generates
four pulse signals for each rotation of the output gear. This
sensor is also used in common for other electronic control
systems.

- -----.--..
14-76FUEL SYSTEM -Auto-cruise Control System
Ignition switch
IGI
9
RESUActuator electro-
Microcomputer
1 T 1
rn’Auto-cruise control unit
Autocruisecontrol switch
IGlMAIN
;FF -+++&Control unit
power supply
terminal voltage
03AO264NC: Normally closed
07*0040
AUTO-CRUISE CONTROL SWITCH
The auto-cruise control switch is built into the steering column
switch.MAIN SWITCH
The MAIN switch is an automatic reset type switch to turn ON
and OFF the power supply of the control unit.
COMMAND INPUT SWITCHES (SET and RESUME)
The SET and RESUME switches function to input the control
signals of the auto-cruise control system; both are the
automatic-reset type.
These switches are ON while pressed and OFF when released.
For the ECU’s input interface, each of the input terminals is
pulled up by the battery voltage; the terminal voltage is LOW
level
(OV) when the switch is ON, and is HIGH level (about 12V)when the switch is OFF. These voltage changes (digital
sig*)are input to the microcomputer as ON and OFF signals
o.:
switches.
.

21-40AUTOMATIC TRANSAXLE - Transaxle Mechanism
START SAFETY MECHANISM
Inhibitor switch
Manual control lever
--
Connector-7DN R
‘,T,i \ ! I
‘\FlI
\ L
,p
( /1750253
1750149
Internal Connection in the inhibitor Switch
,
Teh;ina’ P R N D 2 LConnected circuits1 The start safety mechanism ensures the safety
during the engine starting operation. When the
selector tever is in the position other than “P” or
“N”, the electrical circuit for starting the engine is
kept in the OFF state by the inhibitor switch.
Therefore, the engine does not start even if the
ignition switch is turned to the “START” position.Inhibitor switch is installed on the transaxle case
located at the upper end of the manual control shaft
and is interlocked with the manual control lever. By
shifting the selector to the
“P” or “N” range, the
electrical circuit inside the inhibitor switch is con-
nected to form the ignition circuit with which the
engine can be started. When the shift is in the
“R”range, the backup light lights up as the backup
lightcircuit is energized.
The inhibitor switch, in addition to the start safety
device, ‘also includes a circuit for detection of the
selector lever position, for sending signals to the
transaxle control unit.
011Transaxle control unit0
Transaxle control unit
Transaxle control unit0000Ignition switch “ON”
terminal6
Transaxle control unit0
Transaxle control unit
I
7) 161 ) 1 ( 1Transaxle control unit
I I I I I I IIignition switch “ST”
terminalStarter motor “S”
terminal
10Ignition switch “ON”terminal
Backup light

.-AUTOMATIC TRANSAXLE
- Transaxle Control21-49
Transaxlecontrol unit
Eel
6017!au72
THROmE POSITION SENSOR
The throttle position
SenSOr is installed on the throttle body.
The throttle position sensor Of variable resistor type
senses thethrottle valve
opening.
As the throttle shaft turns, the resistance i.e. output voltage of
throttle position sensor changes. This throttle position sensor
output voltage is input to the transaxle control unit to compute
the throttle opening.
The throttle position sensor output voltage can be adjusted by
turning the throttle position sensor body.
Throttle position sensor output characteristics
5
1
0’ ’10 20 30 40 50 60 70 80 82Totally Throttle valve opening (degrees) Totally
closedopened7FUO75control switchKICKDOWN SERVO SWITCH
The adjust sleeve and the retainer constitute the contacts of
the kickdown servo switch. The switch detects the position of
the kickdown piston just before the kickdown brake is applied,
and sends the signal to the transaxle control unit.
When the kickdown servo is not in operation, the switch
contacts are kept closed.
When the hydraulic pressure is applied to the kickdown servo
and the piston is operated,
the’adjust sleeve separates from
the retainer, turning off the. switch.
Using the kickdown servo switch OFF signal as its standard,
thetransaxle control unit controls the 2nd pressure before, and
during application of the brake by actuating the pressure
control solenoid valve.
OVERDRIVE CONTROL SWITCH
When the overdrive control switch is ON, operation is as a
O-speed automatic transaxle.
When the overdrive control switch is OFF, the indicator light
(within the combination meter) is illuminated, and operation
isas a
3-speed automatic transaxle.

BODY - Seat Belts23-37COMPONENT PARTS AND FUNCTION
4utomatic Seat Belt Control Unit
arter panel
qelease Switch (L.H., R.H.)
‘Fasten”Switch (L.H., R.H.)
uide rail
1SAO310
Seat Belt Warning Light/Reminder Light
Buckle Switch (driver’s seat)
Outer Switch (LH., R.H.)
Located at the quarter panel on the driver’s seat side.The system is controlled based upon various input signals, thereby
regulating motor operation,
warnrng light illumination or continuousflashing, and buzzer sounding.
Located at the front of the guide railThis switch is for turning the shoulder belt drive motor off.
It transmits an “OFF” signal to the control unit when the shoulder
belt is completely unfastened. Once the “OFF” signal is received,
the control unit shuts off the motor.
Located at the rear of the guide railThis switch is for turning the shoulder belt drive motor off.
It transmits an “OFF” signal to the control unit when the shoulder
belt is completely fastened. Once the “OFF” signal is received,
the control unit shuts off the motor.
Located at the combination meter.
This light warns the driver
and/or passenger to fasten his/her seat
belt; it illuminates of flashes by the control unit, and the length of the
illumination or flashing time changes, dependent on which seat belt
is not fastened. (Refer to WARNING SYSTEM)
Located at the driver’s seat belt buckle.This switch transmits an “OFF” signal to the
control unit when the
lap belt is fastened and an “ON” signal when it is not fastened.
Incorporated within the shoulder belt retractor.
This switch detects the amount of shoulder belt wind-in and sends
an “OFF” signal to the control unit if the amount of wind-in is the
specified amount or more. or an “ON” signal if the amount of
wind-in is less than the specified amount.

BODY- Seat Belts*23-41
switchDriver’s
side buckle
switch
Buzzer(ON’ XL(OFF)
,: Approx. 0.7 sec./cycle
Key-reminder (ON)switch (A) (OFF)
Buzzer
19Poo270
Automatic seat belt control unit
connector terminals
lsPo2eeWarning Alarm when the Driver’s Lap Belt is not Fastened
When, with the driver’s lap belt unfastened (the buckle switchis switched ON), the ignition switch is tunrned from the
“LOCK” or
“ACC” position to the “ON” position, the buzzer
will sound intermittently for approximately 6 seconds. If,however, the driver’s lap belt is fastened during that time, the
buzzer will be switched
OFF.
Note that the warning light when the ignition switch isactivated will also illuminate when the ignition switch is turned
from the “LOCK” or “ACC” position to the “ON” position.
Warning Alarm when the ignition Key is Left in the Ignition
The buzzer will sound continuously when all of these condi-
tions occur simultaneously: the key is in the key cylinder
(key-reminder switch A is switched ON), and the ignition
switch is at the “LOCK” or “ACC” position, and the driver’s
door is open (the door latch switch “open” is switched ON).
Warning Alarm when an Automatic Seat Belt Starts to
Move toward the “Release” Side
When the driver’s or front seat passenger’s automatic seat belt
starts to move toward the “release” side, the buzzer sounds
for approximately 0.7 second.AUTOMATlC SEAT BELT CONTROL UNIT INPUT/OUTPUT
SIGNALS
Power Supply and Ground Circuit
INameITerminal No.IVoltage levelI
I Battery (+B)I11I H 1
I Ignition switchI ’ IH or LI
IGroundI7, 17Io.ovI
NOTEH and L in the voltage level column indicate the terminal voltage Of
each signal.H: Battery voltageL:Ground voltage (0.8V or less)