ignition MITSUBISHI ECLIPSE 1990 Workshop Manual

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.

FUEL SYSTEM -Auto-cruise Control System14-73IF MAIN SWITCH
IS SWITCHED OFF
‘*‘hen the driver switches OFF the MAIN switch,
Jconductivity to the electromagnetic clutch is
interrupted, the clutch plate is returned from the
electromagnetic clutch side to the ring gear side by
the spring, thus freeing the spring.
When the ring gear becomes free, the planetary
pinion, carrier, selector drive shaft and selectorbecome free relative to the sun gear (DC motor),
and the selector is returned to the original position
by the return spring installed to the selector.
The planetary pinions
turn on their own axes while
rotating around the sun gear because of the rotation
of the carrier. As a result, the ring gear idles. All this
results in the cruise control being canceled.
DCSelector drive shaft
IF CANCEL SWITCH IS SWITCHED ON
IBattery
IIIIgnition switch 411IInhibitor switch
f’ J
r--
if-Starterz _Auto-cruise
f
AA)\AA
5V
pF p
+ i%zv)
5-VComl
Cancel interface circuit
bs- Tts ec
I
r-
[ON
NC: Normally closed
NO: Normally opened
‘OFF OFF
IMicrocomputer

- -----.--..
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.
.

AUTOMATIC TRANSAXLE - A/T Safety-lock System21-19
4/T SAFETY-LOCK SYSTEMRzsAAaTo prevent sudden start due to malfunction of
automatic transaxle vehicle, the following system
has been installed.
SHIFT LOCK DEVICE
It is so designed that unless the brake pedal is
depressed, the shift lever cannot be shifted from
the “P” position to any other position. In addition,
when the ignition key is in the LOCK position or is
removed from the lock, the, shift lever cannot be
shifted from the “P” position to other position even
if the brake pedal is depressed.
KEY INTERLOCK DEVICEIt is so designed that unless the shift lever is placed
in the “P” position, the ignition key does not turn to
the LOCK position.
KEY INTERLOCK DEVICE
SHIFT LOCK DEVICE
Shift lever
Transaxie control cable
Shift dieOQA0152
c\

-_ - .--.7
!21-20AUTOMATIC TRANSAXLE - A/T Safety-lock System
SHIFT LOCK DEVICE
When brake pedal is not depressed
Brake pedal link mechanismWhen brake pedal is depressed
Detent pin
Shift lock pini
Brake
Shift lock cable
-JIOuter cableInner cable
\\
/IShift loc&
OQAO155-
Ret& springOBAOl53
The shift lock device consists of the brake pedal
link
mechanism and the shift lock cable. When the brakepedal is depressed, the shift lock pin combined in
one unit with the inner cable moves into the outer
cable.
L
I(1) Wheh brake pedal is not depressed
IWhen the shift lever is in the “P” position and
the brake pedal is not depressed, the shift lever
cannot be operated into the position other than
the
“P” position despite an effort to operate the
lever, because the shift lock pin combined with
the inner cable in one unit prevents the detent
pin movement, making it impossible to depress
the push button of the shift lever.
(2) When brake pedal is depressed
When the shift lever is in the “P” position and
the brake pedal is depressed from the released
state, the inner cable of the shift lock cable is
’ !I
Ipulled by action of the brake pedal linkage. In
this case, the shift lock pin at the end of the
inner cable is also pulled and the detent pin isreleased.Therefore, the shift lever can be shifted to the
positions other than the “P” position.
NOTEEven if the brake pedal is depressed with the
ignition key in the LOCK position or the key
removed from the ignition lock, the selector
handle cannot be shifted to the positions other
than the “P” position. (Refer to (2) Key interlock)
(3) When shifting from positions other than “P”position to
“P” position
When shifting is made from the positions other
than “P” position to the
“P” position, it is not
necessary to depress the brake pedal because
the detent pin moves to the
“P” position whilepushing the shift lock pin. If the push
buttotisreleased, the detent pin moves to the
position (upward) and the return spring provided
in the outer cable returns the shift lock pin to
thestate described in (1). This will fix the shift lever
in the “P” position.

AUTOMATIC TRANSAXLE - A/T Safety-lock System21-21KEY INTERLOCK DEVICEWhen shift lever is in positions
When shift lever is in “P” position
LOCK
\Hcjok
Projection of rotorother than “P” position
KC position
Hook
\ \Detent pin
Lock &mThe key interlock device consists of the ignition key
cylinder, interlock cable and the lock cam installed
inside the selector handle. The lock cam is inter-
locked with the detent pin and their movement is
‘transmitted to the hook inside the ignition key
Q4inder through-the key interlock cable.
!l) Shift lever is in “P” position
a. When the shift lever is in the
“P” position.
j..the hook inside the ignition key cylinder is SO
i-.3positioned that it does not interfere with the’ .L.,projection of the rotor. Therefore, the rotor
:‘-can turn freely, allowing the ignition key to
be turned to the LOCK position and pulled
out there.
is, b. When the ignition key is turned to the LOCK
i,- c.position or it is pulled out, the projection of‘..the rotor moves to the position where it
prevents the hook inside the key cylinder
from moving. Therefore, even if an effort is
made to depress the push button of the shift
lever, the lock cam prevents the detent pin
from moving and the shift lever cannot be
shifted to the positions other than the “P”nnrit;nn
09*0090
(2) When shift lever is in position other than “P”position
When the shift lever is in the positions other
than the
“P” position (for example. “N” posi-
tion), the lock cam turns clockwise and held in
that
.state as shown in (2) of the illustration.
Therefore, the key interlock cable is in a stroked
state, with the hook inside the ignition key
cylinder inserted in the notch made in the
projection of the rotor. Thus, even if it is
attempted to return the ignition key to the
“LOCK” position, the hook prevents the rotor
from turning and the ignition key can be turned
only up to the
ACC position, making it impossi-
ble to pull out the key.

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 Control21-47
+TFWNSAXLE CONTROL UNIT
Part b!o. and Ident. No.17504The transaxle control unit functions, based upon the data
signals from the various sensors, to drive the shift controlsolenoid valves “A” and
“B”, and the pressure control solenoid
valve, and to make shifting pattern control and hydraulic
pressure control during shifting.
The transaxle control unit is installed within the passengercompartment, at the lower part of the heater unit.
Connections of the transaxle control unit’s terminals” and
sensors with the drive devices are as described below.
Terminal No.Terminal No.
1Diagnosis control51Pulse generator “A”
2Overdrive control switch52Pulse generator “B”
3Inhibitor switch e R U53Sensor ground
4Inhibitor switch “D”
54Power supply (for sensor)
5Inhibitor switch “L”55 -
6Damper clutch control solenoid valve56Power supply (for backup)
7Shift control solenoid valve “B”57Pulse generator “A”
8Accelerator switch58Pulse generator “B”
9Power/Economy select switch59Kickdown servo switch
10Ground60Throttle position sensor output
11Power supply61Vehicle speed sensor
12Inhibitor switch “P”62Oil temperature sensor
13Inhibitor switch “N”63Ground
14inhibitor switch “2”
15Pressure control solenoid valve
16Shift control solenoid valve “A”
17
-
18Ignition pulse signal
19Diagnosis output
20Air conditioner relay signal
rACCELERATOR SWITCH
The accelerator switch is installed on the upper portion of the
accelerator pedal.
The accelerator switch closes its contacts when the accelera-
tor is totally closed (or the accelerator pedal is completelyreieasedj‘and sends on ON signal to the transaxle control unit.
When the accelerator is depressed, it send an OFF signal to the
transaxle control unit. Whiie the switch is kept ON, for example
when the vehicle is stationary with the accelerator pedal
completely released, the vehicle remains in
2nd gear, but if the
accelerator pedal is depressed sending the accelerator switch
OFF signal to the transaxle control unit, the unit sends a signal
to the shift control solenoid valve instructing it to cause a
downshift to 1 st, thereby producing maximum acceleration.
When the vehicle is stationary, the gear is kept in the .2nd,
which produces an adequate creeping force and also de-.
creases vibrations.

AUTOMATIC TRANSAXLE - Transaxle ControlSELF-DIAGNOStS SYSTEM
The transaxle control unit has self-diagnosis function.
Self-diagnosis codes can be read by connecting a voltmeter to the
diagnosis connector on the side of the junction block.
0: Ground
6%: ELC-MIT
Self-diagnosisThere are 25 diagnosis items, including those items
indicating normal conditions; a maximum of
10items can be stored in memory in the order that
they occur. The memory is supported by a power
supply directly connected to the battery so that it isretained even after the Ignition switch is turned to
the off position.
To clear the memory once an inspection has been
completed. keep negative
(-) terminal of the
battery disconnected for
10 seconds or longer.
r
No.
23
24
Output code
Display pattern
TDiagnosis itemRemarks
NormalAbnormal increases of throttle position
sensor output
Abnormal decrease of throttle position
sensor output
Poor adjustment of throttle position sen-
sorOpen circuit in oil temperature sensor
Once this occurs, output is re-
garded as 2.5 V.Once this occurs, output is re-
garded as 2.5 VOnce this occurs,
oil temperature isregarded as 80°C (176°F).