1989 MITSUBISHI GALANT fuse

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
6. CHECKING THE STOP LIGHT SWITCH CIRCUIT13-357
Stop lrght
Sub fusible link @I
Stop lrght
Auto-cruisecontrol unit 13AQ375
Description of operation
When the brake pedal is depressed during constant-speed
travel, the stop light
swrtch’s (NC) contacts for the cruise-control system open, with the result that the current to the
auto-cruise vacuum pump is interrupted, thus canceling the
constant-speed travel.At the same time, moreover, the closing of the (NO) contacts
for the stop light results in the sending of the cancel signal to
the control unit, so that the auto-cruise vacuum pump current isdiscontinued within the control unit, thereby canceling theconstant-speed travel.
The flow of current is from the sub fusible link @ to fuse No. @Iof the junction block, the stop light switch, and the control unit.
Troubleshooting hint
ECU terminal voltage
TerminalSignal ConditionsTerminalNo.voltage
15Stop light
When the brake Batteryswitch (loadpedal is depressed.positive
side)voltage
When the brakeovpedal is notdepressed.
NOTENC: Indicates ON at all times. (For cruise control)
NO: Indicates OFF at all times. (For stop light)
7. CHECKING THE PARK/NEUTRAL POSITION SWITCH CIRCUIT Description of operation
The park/neutral position switch also functions as the switch
for the starter. If the selector lever is moved to the “N”
pos-ition during constant-speed travel, current flows to the con-trol unit, park/neutral position switch, starter motor, and to
ground; the cancel signal is therefore input to the controlunit, thus canceling the constant-speed travel.
Troubleshooting hint
ECU terminal voltage
(I)
ia
Starter
motor
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AUTO-CRUISE CONTROL SYSTEM - Troubleshootinn13-367
LOCATION OF CONTROL UNIT
w
16AO406
GROUND POINT
JUNCTION BLOCK p-;a
Front
harness
t
Instrument
Roof
harnessr’ II
Ji
-I
$!&;Ipanel
harness Body
harness
z$gger ~----#$jfiillITiHeater- relav
7
J
fuses)
16A0002m36I
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AUTOMATIC TRANSAXLE - Troubleshootina
-
E
1OP
3
@IOA
PT.-. L-_..il Tr-ltn
-

.-
-~-------y~-J4 ~
!kJ-LBII
I II rrl
6Y
* YB
I
7"DI.
(RG)
@ (GL)I
g (GR)Is
2
t I
e_-_-_----_~~__---~~~~~~~ -------w-v----
BY
1 2
s
1
DEDICATED
FUSE
6 C-37
7J/B
8 C-32
POWER/
ECONOMY
!RRi OVER
1
J/C(TAIL)
ELC-4SPEED
AUTOMATIC
;;;f?;;lfLE
MODULE
(GR) 58;&
(RW) 574~
C-60
Remark Xmark
indicates the Optional wirin
g
harness for auto cruise control
system
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-11
CHECKING BY USING THE SCAN TOOL
1. DIAGNOSTIC TROUBLE CODE OUTPUT
TROUBLESHOOTING CHART
DiagnostictroubleMalfunctionVehicle conditioncode No.Probable causeAction
0Normal---
Damaged or disconnected
Alarm light illuminates;0 Improper installation Troubleshoof
wiring or short-circuit of Gamong attitude-control of G sensor.
sensor input circuit, or Ging hints
modes, only rolling control
sensor malfunction. l
G sensor internal wiring
classified by
stops. damaged or disconnected. circuit
[I]
“11(Others operate normally.)l Damaged or disconnected
wiring or short-circuit of
G
sensor circurt.
l Connector of
G sensor
circuit disconnected.
0 Malfunction of ECU.
W
ith the ignition key at the
The charging warning light
ON position and the vehicle illuminates, and,
0 Insufficient generator “L”Troubleshoot
speed at 40 km/h (25 mph) furthermore, the system terminal output voltage
ing hints
or higher, the output does not function when the (malfunction of the
classified by
charging system). circuit
[2]
voltage of the generator ‘I”vehicle is stopped (vehicle0 Harness short-circuit
terminal is approximately speed of 3 km/h (2 mph) or
5V or lower
lower). between the generator“L” terminal and the ECU.“12
NOTEl ECU malfunction.
The alarm light does not illuminate, and,
furthermore, there is no
detection of harness
damage or disconnection
between the generator “L”
terminal and the ECU.
The low-pressure switch is The alarm light illuminates,
l Low-pressure switch is Troubleshoot
not switched OFF even and only the attitude-control
fused.
though the attitude-control ing hints
function stops. (Other l Damaged or disconnected classified by
function is performed 30 functions are normal.) circuit
131
13times. The return pump is wiring, or short-circuit, of
the low-pressure switch
activated frequently. circuit harness.
0 The connector of the
low-pressure switch
circuit is disconnected.
l Air leakage from the low-pressure tank
(including tubing).
l ECU malfunction.
“21
Damaged or disconnected The alarm light illuminates,l Steering angular-velocity Troubleshoot-
wiring of the steering and the attitude-control sensor malfunction.
angular-velocity sensor ing hints
function stops. The
input circuit, or a l Damaged or disconnected classified by
damping force is held to wiring of the steeringcircuit
191malfunction of the steenng
MEDIUM, and the vehicle
angular-velocity sensor. angular-velocity sensor
height is held to NORMAL circuit harness.
l Disconnection of the connector of the steering
angular-velocity sensor
circuit.
l ECU malfunction.
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-13
Diagnostic
trouble
zode No.MalfunctionVehicle condition Probable causeAction
Damaged or disconnected The alarm light illuminates,
l All connectors of theTroubleshoot
wiring of the damping force and the attitude-control
damping-force switchinging hints
switching actuator (step function and the damping-
actuator (step motor classified by
motor type) or of the force control function are
type) and the actuatorcircuit
[ 171
actuator circuit, or a
stopped.
circuit are disconnected.
malfunction of an output The vehicle height is held to
l Damaged or disconnected41transistor within the ECU. NORMAL.
wiring, or a short-circuit, of
the damping-force
switching actuator (step
motor type) and the
harness of the ECU part of
the actuator circutt.
l ECU malfunction.
There is damaged or The alarm light illuminates,
l The solenoid valve power Troubleshoot-
disconnected wiring, or a and the attitude-control
short-circuit, of the solenoid source relay contacts are
ing hints
function and the
vehicle-fused. classified by
valve power source relay height control function are
circuit. l Damaged or disconnected circuit
(71stopped.
wiring of the solenoid
The damping force is held valve power source relay
to MEDIUM. coil.
42
l Damaged or disconnected
wiring, or a short-circuit, of
the solenoid valve power source relay circuit.
l Disconnection of the connector of the solenoid
valve power source relay
circuit.
l ECU malfunction.
Damaged or disconnected The alarm light illuminates,
l Damaged or disconnected Troubleshoot-
wiring, or a short-circuit, of and the attitude-control wiring, or a
short-circuit, ofing hints
the compressor relay function and the
vehicle-the compressor relay coil.classified by
circuit, or a malfunction of height control function are
l Damaged or disconnectedcircuit [I81an output transistor within
stopped.
43
the ECU.wiring, or a short-circuit, of
The damping force is held the compressor relay
to MEDIUM.
circuit harness.
l Disconnection of the
compressor relay circuit
connector.
l ECU malfunction.
Damaged or disconnected The alarm light illuminates,
l Damaged or disconnected Troubleshoot-
wiring, or a short-circuit, of and the attitude-control
wiring, or a short-circuit, ofing hints
the return pump relay function and the
vehicle-the return pump relay coil.classified by
circuit, or a malfunction of height control function are
l Damaged or disconnectedcircuit [I91an output transistor withinstopped.
the ECU.The damping force is heldwrring, or a short-circuit, of44
the return pump relay
to MEDIUM. circuit harness.
l Disconnection of the return pump relay circuit
connector.
l ECU malfunction.
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshootina 33B-15
Diagnostic
trouble
code NoMalfunction Vehicle condition Probable causeAction
52
Damaged or disconnected
The alarm light illuminates, l Damaged or disconnected Troubleshoo
wiring of the left front or and the attitude-control wiring of the left front or
ing hints
right front valve actuation function and the vehicle- right front valve coil.
classified by
circuit, or a malfunction of height control function arel Damaged or disconnected circuit
[25]an output transistor within
stopped. wiring of the left front orthe ECU.The damping force is held
right front valve circuit
to MEDIUM. harness.
l Disconnection of the connector of the left front
or right front valve circuit.
l ECU malfunction.
53
Damaged or disconnected The alarm light illuminates,
wiring of the left rear or right l Damaged or disconnected Troubleshoot
and the attitude-control wiring of the left rear or
rear valve actuation circuit, ing hints
function and, the vehicle- right rear valve coil.
classified by
or a malfunction of an output height control function are
transistor within the ECU. l Damaged or disconnected circuit
[26]
stopped.
wiring of the left rear or
The damping force is held right rear valve circuit
to MEDIUM.
harness.
l Disconnection of the connector of the left rear
or right rear valve circuit.
l ECU malfunction.
54
55
Even though three mrnutes
The alarm light illuminates,0 Overloaded condition. Refer to
or more have passed for the and the attitude-control l Improper adjustment ofMalfunction
vehicle-height adjustments function and the vehicle- the front or rear
of the front and the rear, and Symptoms
height control function are vehicle-height sensor.
Chart [A] onthe pressure within thestopped.l Air-pressure line isP.33B-17.high-pressure
tank is
The damping force is held
sufficient (the high-pressure clogged.
to MEDIUM. l Malfunction of the front
switch is OFF), the strut unit or the rear shock
vehicle-height adjustments absorber unit air spring.
are not completed. l ECU malfunction.
Even though three minutes The alarm light illuminates,
l Compressor malfunction.Refer to
or more have passed for the and the attitude-control Damaged orMalfunction
vehicle-height adjustments function and the vehicle- disconnected wiring ofSymptoms
of the front and the rear, and height control function are
the harness between theChart
LB1 on
with insufficient pressure stopped. compressor relay and the
P.33B-17.
withtn the high-pressure tankThe damping force is held
compressor.
(the high-pressure
switch isto MEDIUM.
Malfunction of the air
iON), the vehicle-height compression of the
adjustments are not compressor.
completed, or the l Air leakage from the
compressor has operated
continuously for four high-pressure tank
minutes or longer. (non-airtight connection
with the low-pressure
tank).
l High-pressure switch is fused.
The return pump is Control functions are not Air leakage within the frontReplace the
continuously activated stopped (alarm lamp does (left or right) or rear (left orfront or rear
(repeatedly starts and stops not illuminate).
right) valve.solenoid
56erght times), even though
valve.
neither the attitude-control
function nor the
vehicle-height control
function has been initiated.
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-35
Service data indication
Code No Indication
Standard value
17ECU input voltage indications when When switches are openSPORT, AUTO, SOFT, HIGH5V
switches are pressed.When SPORT switch
is ONOV
When AUTO switch is ON1.53v
When SOFT switch is ON 2.71V
When HIGH swrtch
is ON 4.02V
ACTIVE-ECS indicators check chart
1.Checking the power source circuit
Disconnect the battery terminals, and, after erasure of the
ECU mode memory, turn the ignition key to the ON position.
1
Indication example
17: MANUAL CNG. SW
4.03v
The sound of the damplng force switching actuators (steplNoThe ACTIVE-ECS power relay doesn’t function
motors), installed at the front struts and at the rear shock
--+l Disconnected or damaged wiring of the fusible link, the
absorbers, will be heard. fuse and/or the harness between the battery and the AC-TIVE-ECS power relay contacts
Yes
When terminal 15 of the ACTIVE-ECS indicator is grounded,yes
the “SOFT” damping force characteristic indicator and the -lDisconnected or damaged wiring of the ground line 15 of
“NORM” vehicle-height indicator will
illuminate.the ACTIVE-ECS indicator.
No
Approximately
12V is measured when the voltage betweenNo
ground and terminal 20 of the indicator and the ACTIVE-ECS --+l Disconnected or damaged wiring between the AC-
is measured. TIVE-ECS power relay and ECS Indicator
terminal 20.
I Yes
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-. ACTIVE-ECS Indicator power source circuit OK Proceed to
checking of the individual ACTIVE-ECS
lndlcators

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-57
Operation
The compressor is activated when the pressure
within the high-pressure tank decreases to 760
kPa
(108 psi) or lower, and then stops two seconds after
the pressure reaches 950
kPa (135 psi). Note,
however, that the compressor is not activated while
Diagnostic If there is damage or disconnection of the heavy-line
circuit, or a short-circuit, or a malfunction of the
output transistor within the ECU, the alarm light illuminates and control is as described in the table the return pump is operating. A thermal switch is
provided at the motor circuit. This thermal switch
functions to interrupt the power to the motor (in
order to protect the compressor) if the temperature
within the compressor becomes high.
below.
(Note that the diagnostic is only applicable up to the
compressor relay.)
Diagnostic No.
43
Attitude control
Control stop Damping force
control
Held at MEDIUM Vehicle-height
control
Control stopHIGH
Switch acceptance
SPORT AUTOSOFT
Not accept
Actuator compulsory activation
1 CodeNo. /Applicable operationIDescription of activationI
05Compressor relay ON The compressor relay is compulsorily switched ON for a period of three s\
econds.
ECU terminal voltages (when connector is connected)
TerminalNo.Signal ConditionTerminal
voltage
23Compressor relay actrvatron
signal When the compressor relay is ONB+
When the compressor relay is OFF o
v
During fail-safe ov
(solenoid valve power-source relay switch OFF) ---
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Checking the compressor drive circuit (with the connector disconnected)\
B+: Battery positive voltage
Terminal Connection destination or
MeasurementNo.measured part Tester connection
Check conditionStandard
~~
Compressor relay Resistance52-ground
Troubleshooting hints (mechanical malfunctions)
Malfunction
mode Malfunction probable cause
Malfunction
Note
The compressor relay is fused. The compressor relay contacts are shorted.
The compressor won’t stop, causing the battery
-to discharge.
The compressor is The compressor won’t operate due to shorting, The vehicle height can’t be increased.
-
stuck.
etc.