ESC MITSUBISHI 3000GT 1996 2.G User Guide

Downloaded from www.Manualslib.com manuals search engine 54-202CHASSIS ELECTRICAL - Rear Window Defogger
With voltmeterData link connector
When using the MUT-IICUD to 1993 models>
Y2OFO16400002231
Ground
INPUT SIGNAL

When using the scan tool
(MUT) or voltmeter
Using the scan tool or voltmeter, check whether or not the
input signals from each switch are being input to the ETACS
unit.
(1) Connect the scan tool to the data link connector located
at the right side of the junction block or connect the voltme-
ter between the ETACS terminal and the ground terminal.
(2) Check if the buzzer of the scan tool sounds or the needle
of the voltmeter moves when each switch is operated.
If the buzzer sounds or the needle moves, the input signalsare being input to the ETACS unit, so that switch can
be considered to be functioning normally. If not, the switch
or switch input circuit is faulty. Check the switch and the
switch input circuit.

When using the scan tool (MUT-II)
(1) Connect the scan tool to the data link connector. When
connecting the scan tool to a vehicle up to 1993 models,
use the adapter harness supplied together.
Caution
Turn off the ignition switch beforehand whenever thescan tool is connected or disconnected.
(2) If the scan tool makes a peep sound when each switchis operated (turned ON/OFF), the input signal to ECU
is normally sent from the switch circuit system. 1994 models>
When using the voltmeter
(1)Connect a voltmeter to the ETACS terminal and the ground
terminal of the data link connector using the special tool.
(2) If the voltmeter pointer deflects once when each switchis operated (turned ON/OFF), the input signal to
.ECU
is normally sent from the switch circuit system.
U2OFO163
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Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Rear Window Defogger54-203
L
L-J
c
Normal characteristic curve
Voltage
j\
PositivePrinted heater lineterminalNegativeterminal
Abnormal characteristic curve
Voltage
Qj (( r”!“Yui;
Positive
terminalPrinted heater line Negativeterminal
216Y332
BreakTape
\
Conductive
paint
216Y333
16FO16700002409ON-VEHICLE SERVICE
THE PRINTED-HEATER LINES CHECK
(1) Run engine at 2,000 rpm. Check heater element with bat-tery at full.
(2) Turn ON rear window defogger switch. Measure heater
element voltage with circuit tester at rear window glass
center A.
Condition good if indicating about 6 V.
(3) If 12 V is indicated at A, there is a break in the negative
terminals from A.
Move test bar slowly to negative terminal to detect where
voltage changes suddenly (0 V).(4) If 0 V is indicated at A, there is a break in the positive
terminals from A. Detect where the voltage changes sud-
denly (12 V) with the same method described.
THE PRINTED-HEATER LINES REPAIR
REQUIRED MATERIALSl Thinner
l Tapel Lead-free gasoline
l Fine brush
l Conductive paint
(1) Clean disconnected area with lead-free gasoline. Tape
along both sides of heater element.
(2) Mix conductive paint thoroughly. Thin the required amount
of paint in a separate container with a small amount of
thinner and paint break three times at 15 minute intervals.(3) Remove tape and leave for a while before use (circuit
complete).
(4) When completely dry (after 24 hours) finish exterior with
a knife.
Caution
Clean glass with a soft cloth (dry or damp) along defog-
ger heater element.REAR WINDOW DEFOGGER SWITCH
(1)Remove rear window defogger switch from the meter bezel.(Refer to
P.54-109.)
(2) Operate the switch and check the continuity between the
terminals.
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Downloaded from www.Manualslib.com manuals search engine 54-220CHASSIS ELECTRICAL - Theft-alarm Svstem
With voltmeterData link connector
\‘%S$F- Data link t Ground ETACS z16R1338
When using the MUT-II4Jp to 1993 models>
Y2OFO16400002231TROUBLESHOOTING GUIDE
CHECKING THE INPUT
When using the scan tool
(MUT) or voltmeter
1. Connect a voltmeter between terminal for ETACS and
terminal for ground, or connect the scan tool to the data
link connector.
‘d

When using the scan tool (MUT-II)
1.Connect the scan tool to the data link connector. When
connecting the scan tool to a vehicle up to 1993 models,
use the adapter harness supplied together.
Caution
Turn off the ignition switch beforehand whenever thescan tool is connected or disconnected.vi
UZOFOlfX3

When using the voltmeter
1.Connect a voltmeter to the ETACS terminal and the ground
terminal of the data link connector using the special tool.
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Theft-alarm Svstem
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CHECKING THE CIRCUIT AND INDIVIDUAL PART1. ETACS POWER-SUPPLY AND GROUND CIRCUITS
Description of operationThe battery supplies a stabilized 5 V power supply to the
ECU, via the constant-voltage circuit and terminal 51 (which
is directly connected to the battery).
ECU terminal voltage (Connection condition of the ECU con-
nector).
I
ECU
SignalConditionTerminal
terminal No.
voltage
51ECU power supplyAt all times12v
2. KEY-REMINDER SWITCH INPUT CIRCUIT
Description of operationThe key-reminder switch is switched OFF and HIGH-level
signals are sent to the ECU when the key is inserted into
the ignition key cylinder: when the key is removed, the key-re-
minder switch is switched ON and LOW-level signals are sentto the ECU.
ECU terminal voltage (Connection condition of the ECU con-
nector).
I
ECUTerminal
terminal No.SignalConditionvoltage
\
L)
L)
64Key-reminder
switch
Key removed12 V
Key inserted0 V
d
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Downloaded from www.Manualslib.com manuals search engine -
LCHASSIS ELECTRICAL
- Theft-alarm System54-225NOTE
rl:UP to 1993 moaelsf2:From 1994 modet.sKX55-AK-R540¶-N3. HOOD SWITCH INPUT CIRCUIT
Description of operation
When the hood is closed (the hood switch is switched OFF),
HIGH-level signals are sent to the ECU:
When the hood is opened (the hood switch is switched ON),
LOW-level signals are sent to the ECU.
ECU terminal voltage (Connection condition of the. ECU con-
nector).
ECU
terminal
No.
18
Signal
conditionTerminal
voltage
Hood switch HoodOpen OV
Closed 5
V*
*Measurement is not possible by using a voltmeter, but is possible
by using an oscilloscope.4. DOOR SWITCH INPUT CIRCUIT
Description of operation
When the door is closed (the door switch is switched OFF),
HIGH-level signals are sent to the ECU:
When the door is opened (the door switch is switched ON),
LOW-level signals are sent to the ECU.
ECU terminal voltage (Connection condition of the ECU).
ECU
terminal
No.Signal
ConditionTerminal
voltage
10Driver door Driver
switchdoorOpen OV
Closed 5 V*
Passenger
Passen-Open 0 V
door switchger door Closed5 v*I,I
II*Measurement is not possible by using a voltmeter, but is possible
by using an oscilloscope.
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Downloaded from www.Manualslib.com manuals search engine 54-226CHASSIS ELECTRICAL - Theft-alarm System
5. DOOR LOCK ACTUATOR SWITCH INPUT CIRCUIT
Description of operation
When a door is locked by the lock knob or the key, the door
lock actuator switch is switched OFF, and HIGH-level signals
are sent to the ECU. These signals activate the timer circuit
of the R ECU, thereby causing the activation circuit to function,thus
R activating the door lock actuator of all doors.
ECU terminal voltage (Connection condition of the ECU con-
nector).
ECU
terminal
No.
13
14
!
I
t
((
Signal
Door lock ac-
tuator switch
(driver door)
loor lock ac-
uator
switch
:passenger
joor)ConditionTerminal
voltage
Door
Lock:5 V’lock ac- OFF
tuator
switchUnlock: ON 0 V
DoorLock:‘5 v*lock ac- OFF
tuator
switchUnlock: ON 0 V
*Measurement is not possible by using a voltmeter, but is possible
by using an oscilloscope.
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Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Theft-alarm System54-227
:Up to 1993 models>

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KXSS-NC-R5‘05-N6. DOOR KEY CYLINDER UNLOCK AND
LIFTGATE
CYLINDER LOCK SWITCH INPUT CIRCUIT
Description of operation
When the door key is rotated or the liftgate key is unlocked,
R LOW-level signals are sent to the ECU.ECU terminal voltage (Connection condition of the ECU
R
connector).

ECU
terminal No.
19
Signal
Door key cyl-
inder unlock
switch
20Liftgate un-
lock switch
19
20
Door key cyl-
inder unlock
switch
Liftgate un-
lock switch
L
ConditionTerminal
voltage
Door
Not
5Vkey cyl- rotate
inder
0-WRotate 0 V
Door
Not5vkey cyl- rotate
inder
(Wrotateov
LiftgateLock 5 V
Unlock 0 V
Condition
Terminal
voltage
Door
Not
5vkey cyl- rotate
inder
0-WRotate 0 V
Door
Not5vkey cyl- rotate
inder
W-0Rotate 0 V
LiftgateLock 5 V
Unlock 0 V
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Downloaded from www.Manualslib.com manuals search engine 54-228CHASSIS ELECTRICAL - Theft-alarm Svstem
7.
LIFTGATE SWITCH INPUT CIRCUIT
Description of operationWhen the
liftgate is closed (the liftgate switch is switched
ROFF), HIGH-level signals are sent to the ECU. When the
liftgate is opened (the liftgate switch is switched R ON), LOW-level signals are sent to the ECU.
ECU terminal voltage (Connection condition of the ECU con-
nector).
ECU
terminal No.Signal
I
ConditionTerminal
voltage
17Liftgate
switch
_l
Measurement is not possible by using a voltmeter, but is possible
by using an oscilloscope.
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Downloaded from www.Manualslib.com manuals search engine iCHASSIS ELECTRICAL
- Theft-alarm System54-229
JS!SECURITYE-04@y&fiNAT! ON .$36
152
FUSIBLE LINK CE)m
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r%BECATED
mCL
1
TO THE ECUTO THE HORN8. SECURITY LIGHT ACTIVATION CIRCUIT
Description of operation
If all doors are in locked state after key-less locking, the ECUtransistor is turned ON and the security light comes on.
Checking the security light activation circuit (Disconnect the
connector of the ECU and check at the wiring harness side.)Nor-
malMal-
stepCheck objectcondi-func-
Cause
Remedy
tiontion
1D-04connector12v ovterminal voltage 51Fuse (19) dam-Replaceaged or discon-the fusenetted
Harnessdam-Repair the
aged or discon-harnessnetted, or short-circuit
2D-04connector12v ovterminal voltage 52Damaged or dis-
Replaceconnected wiringthe bulbofSECURITYlight bulb
Harness
dam-Repair the
aged or discon-harnessnetted
3ECU terminal volt-12v ovHarnessdam-
age 57Repair the
aged or discon-harnessnetted, or short-circuit9. HORN RELAY POWER-SUPPLY CIRCUIT
Description of operationPower voltage is always supplied to the horn relay.
Checking the horn relay power-supply circuit (Disconnect the
horn relay)
connector terminal
Mal-func-CauseRemedytion
Fuse (3)
dam-Replace the
aged or discon-fusenetted
Damaged or dis-Repair the har-connected har-nessness
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Downloaded from www.Manualslib.com manuals search engine .,i”i, LlNl Q10. HORN ACTIVATION CIRCUIT
?a/ ;
dl
spored10.
Description of operation
The ECU transistor is turned ON if the vehicle door, etc. are
opened without use of the key.
This energizes the horn relay to activate the horn.
Checking the horn activation circuit (Disconnect the connector
of the ECU, then short-circuit terminal connector No.58, and
activate the horn relay.)
54-230CHASSIS ELECTRICAL - Theft-alarm System
z “2
EL? II A-as ’
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c!
ig”‘“,1 u~cw ~ I A.,Op+J
x
6IZ)Y.l,.-”Step
1Check objectmatMal-
I Icondi- functionCauseRemedy
Horn relay termi-nalvoltage(4-Ground)12v ovMalfunction of
Check thethe horn relayhorn relay
(Refer to
P.54-118.)
Horn terminal volt-12v ovHarnessdam-age (LH & RH)Repair the
aged or discon-harness(1 -Ground)netted
Horn terminal volt-age (LH & RH)(1 -Ground)Nor-
1IItion
HornHornMalfunction ofReplacesoundoesn’tthe hornthe hornds (0 sound
V)(0 w
BatteryDamaged or dis-Repair thevoltageconnected wiringharness
of ground circuit
11. THEFT ALARM HORN RELAY POWER-SUPPLY
CIRCUIT
Description of operation
Power voltage is always supplied to theft alarm horn relay.
Checking the horn relay power-supply circuit (Disconnect the
theft alarm horn relay)Check object
THEFT ALARMHORNRELAYconnector terminal
voltage 1NormalMal-
condi-func-
CauseRemedy
tion
tion
12v
ovFuse (14)
dam-Replace the
aged or discon-fusenetted
Damaged or dis-Repair the har-connected har-nessness
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