1991 MITSUBISHI ECLIPSE turn signal

14-114AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
CHECK CHART
1I. CHECKING THE CONTROL UNIT POWER SUPPLY CIRCUIT
Ignition
switch
I
IAF”7Junction 8
block
tI3
Crurse-controlswitch
OFFDescription of operation
When the cruise control switch (CRUISE) is switched ON whilethe ignition switch is ON, current flows to the ignition switch(IG,), to fuse No.(ll) of the junction block, and to thecruise-control switch (MAIN switch), the control unit, and to
ground.When the ignition switch is turned OFF, the MAIN switch in thecruise control switch is also turned OFF.Troubleshooting hint
ECU terminal voltage
TerminalSignal
No.ConditionsTerminalvoltage
t2Control unitWhen the cruise-System
power supplycontrol switchvoltage
(CRUISE) isswitched ON.
8, 14Control unitAt all timesovground
NOTE+: The connector Nos. in Section “AUTO-CRUISE CONTROL
RELATED HARNESSES” and the connector names in the
junction block are represented.
(Applicable on the next page and subsequence.)13AO3632. CHECKING THE SET SWITCH
Auto-cruisecontrol unitDescription of operation
When the SET switch is switched ON (at the vehicle speed
desired to be maintained, and with the CRUISE switch of the
cruise-control switches ON) that vehicle speed is maintained as
a constanf speed.
Furthermore, the constant speed is gradually reduced (the
“coasting” feature) when the SET switch is pressed and held
while the vehicle is traveling at the previously set constant
speed, and, when the SET switch is released, the vehicle then
maintains that newly set constant speed (the speed at whichthe SET switch was released).
Current flows to the control unit, the cruise control switch
(“SET”), and to ground.Troubleshooting hint
Diagnosis-No. 15 (automatically
cancelled)ECU terminal voltage
1 Terrrnal 1 Signal 1 ConditionsrEl
13AO364

14-116AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
5. CHECKING THE AUTO-CRUISE CONTROL VACUUM PUMP
Ignitionswitch (IG,)I
SET
ON
Cruise-controlswitchDescription of operation
Hold modeWhen the SET switch is turned ON by the driver turning the
CRUISE switch ON when a determined speed is reached, thecontrol unit receives a set signal, and turns the auto-cruise
vacuum pump motor ON. After the constant speed is reached,
the motor, control valve and release valve are repeatedly turned
ON and OFF according to driving conditions.
Acceleration mode
When the RESUME switch is pressed, the control unit receives
a RESUME signal and it not only turns the auto-cruise vacuum
pump motor ON but also turns the control valve and releasevalve ON (valve is closed).
Deceleration mode
When the SET switch is held down, the control unit receives a
set signal and
it not only turns the auto-cruise vacuum pumpmotor and control valve OFF (valve is opened) but also turns the
release valve ON (valve is closed).
Release modeWhen the CRUISE switch is turned OFF, the control unit
receives a cancel signal and it not only turns the auto-cruisevacuum pump motor OFF but also turns the control valve and
release valve OFF (valve is opened).Troubleshooting hint
Diagnosis-No. 11 (automatically
cancelled)ECU terminal voltage

14-118AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
8. CHECKING THE CLUTCH SWITCH CIRCUIT
Auto-cruisecontrolunit9
2ClutchswitchOFF ON
1m11Junction
blockI
13AO370Description of operation
If the clutch pedal is pressed wht driving at a constant speed,
the clutch switch is turned ON and a cancel signal is input to the
control unit and the determined driving speed is canceled
because current flows to the clutch, switch junction block from
the control unit and to ground.Troubleshooting hint
ECU terminal voltage
TerminalSignal
No.
1Clutch switch
t--l--II
ConditionsTerminalvoltage
When the clutch
pedal is depressed.
When the clutchpedal is not de-
pressed.
9. CHECKING THE CIRCUITS RELATED TO THE ACCELERATOR SWITCH OFF FUNCTION
Ignition switchm
& Accel-/Description of operation
The accelerator switch is a switch that detects the operationalstatus of the accelerator pedal; it is one of the sensors of theautomatic, transaxle.Because the status of the accelerator pedal during constant-speed driving is non-operational, the ground circuit (transistorTr2) of the accelerator switch is switched OFF only during
constant-speed driving in order not to interfere wtth the function
of the automatic transaxle.Troubleshooting hint
ECU terminal voltage
TerminalNo.SignalConditionsTerminalvoltaoe
’ 3Control unitAt all times
power supply
9Accelerator
When the accel-ovswitcherator pedal is
depressed.
When the accel-Systemerator pedal is not
depressed.voltage
\lOTEJC: Indicates ON at all time.
13AO3711 Not in operation ) OFF 1 ON (

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting1~~ppGJ”10. CHECKING THE CIRCUITS RELATED TO THE OVERDRIVE-CANCELLATION FUNCTION

block
Ov&rive
Auto-cruisecontrol unitswitch
(16)
A574Al-r
control
unitm
(18)Description of operation
This is a function that cancels the overdrive
fur&on for a
certain fixed period of time, if .during constant-speed travel inoverdrive, the actual vehicle speed decreases to less than the
vehicle speed retained in the memory, and then after a short
time causes the vehicle speed to return to the vehicle speed
retained in the memory.
Overdrive is
cancelled under the following conditions.If, during constant-speed travel, the actual vehicle speed
decreases to 7 km/h (4.4 mph) or more below the set vehicle
speed.
Under either of the conditions described above, the overdrive-
ON signals output from the microcomputer (with the control
unit) are no longer output, and transistor Tr, is switched OFF.
As a result, transistor Tr2 is also switched OFF, causing the
current passing through the overdrive switch of the selector
handle to be interrupted at transistor Tr2, with the result that the
drive is controlled ‘at 3rd gear.Troubleshooting hint
ECU terminal voltage
rerNmdra’SignalConditionsTerminali voltage
104A/T control,
unitWhen the overdrive‘sw$ch IS swrtched$ta;;
11;;tt;iveWhen the overdrives&itch IS switched%‘Gg;

14-120AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
11. CHECKING THE THROTTLE POSITION SENSOR AND IDLE SWITCH CIRCUIT<1.8L Engine>
Throttle
position
sensor
MPI controlunitnw374<2.0L DOHC Engine>
ruiseI unitDescription of operation
“s
The throttle position sensor and idle switch are mounted in the,
motor position sensor or throttle body and are sensors in theMPI system. The idle switch is turned OFF when the accelera-
tor pedal is pressed and ON when it is released. In addition,
throttle position sensor output voltage varies according to thedegree of opening of the throttle valve.Troubleshooting hint

Diagnosis-No. 17

Diagnosis-No. 17
ECU terminal voltageTeKlna’
SignalConditionsTerminal
voltage
4Idle switchWhen accelerator
pedal is pressedXFgr
When acceleratorovpedal is released
5ThrottleWhen accelerator 4.OV-5.5V
position sensorpedal is pressedall the way down
When accelerator 0.48-0.72Vpedal is released

14-122AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
DIAGNOSIS DISPLAY PAlTERNS AND CODES
CodeNo.
11
Display patterns (output codes)(Use with voltmeter)
“,;1 fl 1 j--
Probable cause
Abnormal condition of auto-cruise
vacuum pump drive system
Check chart No.
No. 5
12Abnormal condition of vehicle-speed sig-No.4nal system
15"16"12vControl switch malfunction (when SETNo.2, 3
and RESUME switches switched ONovsimultaneously for more than 25 seconds)
I ‘,“,-I r
Abnormal condition of auto-cruiseNo.6,7,8control unit
17Abnormal condition of throttle positionNo. 11
sensorAbnormal condition of idle switch,3*0356
NOTE
1. Codes indicated by the* symbol are displayed, if the conditions are satisfied, even if the system is
normal. In either case, the system is normal if it can be reset. If there is an automatic cancellation not
intentionally made by the driver, however, excluding cancellations explicitly made by the cancel
procedure, there may be a temporary malfunction such as poor contact of a harness connector even
though the system can be reset, and for that reason it is necessary to check according to each
individual check chart that is applicable.Display
when vehicle speed isapproximately 20 km/h (12 mph) less thanor before the auto-cruise control systemis set
ON (12V)
OFF (OV)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 canceled by turning OFF the battery or canceling the
diagnosis codes. (Refer to
P.14-121.)After the diagnosis codes in the memory are erased, if
(when the power supply of the electroinc control unit is
switched ON once again) the power supply of the
electronic control unit is normal, the diagnosis output
code display will be as below, regardless of whether the
system condition is normal or not.
Continuous ON/OFF signals will be displayed at 0.5-second
intervals.(Refer to the figure at the left.)

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting14:f*L3’.INPUT CHECK
a *:;i’ _Input checks should be made when the
auto-cruise’.contr$system. cannot be set and when it is necessary to check.
(when a malfunction related to the auto-cruise control system,
occurs) whether or not the input signals are
no’rmal.
03A0258
NOTE
1. If inspection of self-diagnosis is necessary, confirm diag-nosis code first and conduct input check.’
2. Input check can be conducted by set operations.
Self-diagnosis terminal outputs display patterns.
3. Display codes are displayed only if the circuit is normal
according to the conditions shown in the table on the next
page.(1) The voltmeter is set in the same way as for the
self-diagnosis check.
(2) Turn the ignition switch to ON and switch OFF the CRUISEswitch.
(3) With the SET switch in the ON position, turn the CRUISE
switch ON. Then, within 1
.O second, place the RESUME
switch in the ON position..
(4) Perform each input operation according to the input check
table (on the next page) and read the codes.
(5) Switch the CRUISE switch OFF.

BODY - Troubleshooting23-13
OPERATION
TROUBLESHOOTING HINTS
-.l If the inside lock knobs of the doors are placedin the LOCK (or UNLOCK) position, the switch inthe door lock actuator will be “OFF” (or “ON”),
and the output transistor will be “ON” for 0.5
second according to the timer function in the
door lock control unit (or theft-alarm control unit).As a result, the LOCK side (or UNLOCK side) of
the door lock relay will be “ON”, operating the
actuators of all of the doors.
NOTE
The door lock actuator contains a PTC thermistor
to prevent damage caused by overheating of the
motor. If the central door lock is frequently used,the actuator may temporarily fail to operate. If it
returns to normal in a few minutes, it is not
defective.
1.
2.One of the door lock actuators fails to operate.
l Check the door actuator which fails to
operate.Cannot be placed in the LOCK or UNLOCK
position by the inside lock knob on either driver’s
or front passenger’s seat side.0 Check the switch in the actuator.0 Check the door lock control unit (or
theft-alarm control unit).
DOOR LOCK CONTROL UNIT (OR THEFT-ALARM CONTROL UNIT) TERMINAL VOLTAGE (Connector
Connected)
TerminalSignal nameConditionTerminalNo.voltage1 or
5”’Door lock relayThe moment the inside lock knob is0.5 vs2
activation signal
pressed down (approx. 0.5 sec.)
NormallySystem voltage2 or 19”’
(Driver’s seat side) insideWhen the inside lock knob is placedSystem voltage
door lock knob signalin the “LOCK” position
When the inside lock knob is placedov
in the “UNLOCK” position3 or
4”’Door lock relayThe moment the inside lock knob is0.5 v2
activation signalpulled up (approx. 0.5 sec.)
NormallySystem voltage4 or 20”’
(Passenger’s seat side)When the inside lock knob is placedSystem voltage
inside door lock knob signalin the “LOCK” position
When the inside lock knob is placedovin the “UNLOCK” position5 or
12*’Power supplyAlwaysSystem voltage6 or
7(11)*’GroundAlwaysov
NOTE*I: Vehicles with theft-alarm system.
*2:Because of the internal resistance of the output transistor, the normal terminal voltage is 0.5 V. If it is 0 V, an open orshort circuit in the harness is suspected.