1989 MITSUBISHI GALANT sensor

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-21
TROUBLESHOOTING HINTS CLASSIFIED ACCORDING TO CIRCUITS
Contents
No.
PIG-sensor circuitItem
paw
P.33B-22/IPI
Generator “L” terminal circuit
P.33B-24
[31Low-pressure switch circuitP.33B-26
I41Throttle-position sensor circuitP.33B-28
[51High-pressure switch circuit P.338-30
) [6] / ACTIVE-ECS power-supply circuit
I PI IACTIVE-ECS indicators circuit
1 P.33B-32 1
1

P.33B-34 1
/ P.33B-38 1I L81 IHeadlight switch circuit
1 [9] / Steering angular-velocity sensor circuit/ P.33B-40 1
[lOI /
I
Front-height sensor circuit( P:33B-42I
PIIRear-height sensor circuit
[I21Vehicle-speed sensor circuit
[13]Rear-pressure sensor circuit
[I41 Stop light switch circuit
[I51 Back-up switch circuit
P.33B-44
P.33B46
P.33B-48 P.338-50
P.33B-52
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[If31Door switch circuitP.33B-53
[17]Damping force switching actuator drive circuit
P.338-54
1181Compressor drive circuitP.33B-561
WI

I
I
Return pump drive circuit/ P.33B-58
ml /
I
Exhaust valve actuation circuit (for vehicle-height adjustment)/ P.33B-60
I PII /Flow-rate switchover valve actuation circuit/ P.33B-62 1
I WI /Front/rear exhaust valve activation circuit1 P.33B-64 I
( 1231 1Front air-supply valve activation circuit1 P.33B-66 1
1241Rear air-supply valve activation circuitP.33B-68
[25]Left front/right front valve activation circuitP.33B-70
[=ILeft rear/right rear valve activation circuitP.33B-72
[271ACTIVE-ECS-related diagnostic/service data output circuitP.33B-74

33B-22 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
[l] G-SENSOR CIRCUIT
112A0462
A-23
G-sensor output characteristic
Output voltage (VIRight- Left
IDirection of acceleration
-48.6" -30"
0’ 3P48.6"
LH --RH
Accelera-tion (G)Angle (D)[(A) surfacestandard]
G sensor
C-06
-1
F-l 8
[jiiEB%]
.8_-----
14
ECU
M
713_----
M
0
m
7835
1
standard
surface (A)- 12A0494
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-23
Operation
The G-sensor detects the amount of acceleration
that is generated (to the left or right) when the
vehi-
response to acceleration, and these changes are
cle body turns. Applying the principle of the dif-
taken out as changes of voltage. Within the coil,
ferential transformer, the magnetic field changes silicon oil is enclosed in order to suppress the vibra-
tion of the movable iron core. Note that the
G-sen-
when the movable iron core within the coil moves in
Diagnostic sor is a special sensor for control of rolling.
When signals that are otherwise virtually
in-
conceivable are input due to damaged or discon-
a heavy-line circuit, the alarm light illuminates and
control is as described in the table below.
netted wiring or a short-circuit or similar problem of
Diagnostic No.Attitude controlDamplng force
controlVehicle-heightcontrol Switch acceptanceHIGH
SPORT AUTO SOFT
I11Rolling control
only stops Normal operation
Normal operation Accept
Service data indication
Code NoIndication
Standard value Display
11G-sensor output voltage 2.5V
when vehicle is horizontal 11: G SNSR:
2.5V
ECU terminal voltages (when connector is connected)
Terminal
NoCondition
Terminal
voltageIII
34 Power supply for sensor When the ECU is activated7.3vI
28G-sensor output signal
35 Sensor circuit earth When stoppedi
When wiring is damaged or disconnected
Constantly 2.5V
ov
ov
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-.
Checking the G-sensor circuit (with the connector disconnected)
Terminal ConnectIon
destination or MeasurementNomeasured part Tester connection
Check conditionStandard
28 G-sensor output
Resistance
28-2ConstantlyContinuity
34G-sensor power source
Resistance34-1ConstantlyContinuity
Troubleshooting hints
Malfunction
mode Malfunction probable causeMatfunctIonNoteSilicon
oil leakage
Because the sillcon
oil for
suppresslon of
l Rolling control occurs frequently-
vlbratlons of the G-sensor movable iron core is leaktng due to a collision.
the sensitivity is
oversensitive.
Damaged or
disconnected
earth line The ground line is damaged or disconnected.
l-Malfunction is not detected because the There are times of a feeling of
ground line is grounded to the G sensor’s body incompatibility of the rolling control
l
itself, however, noise is easily picked up. Rolling
control occurs suddenly; an error
occurs

33B-28 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
[4] THROll-LE-POSITION SENSOR CIRCUIT
(1989 models)
(From 1990 models) A-54
+@7jg
(From 1990 models)
Throttle-position sensor output characteristic
5
24
%13932a501
0’ ’’I III III1020304050
60 70
8082
FullyThrottle openingFUIIYclose
d
(degrees)open
7FUO75
ECM
A-54
(1989 models)
Throttle-position
sensor
NOTE* mark is applicable for 1990, 1991, 1992, 1993 models. 12A0432
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-29
Operation
The throttle-position sensor is the same for the ECM of engine and transaxle. The ECM estimates
the acceleration status of the vehicle according to
the sensor output.
Service data indication
) Code No 1 lndrcatron
Display
I
l4 1
The output voltage of the throttle 14: TPS 549mV-postron sensor IS indicated.I
ECU terminal voltages (when connector is connected)
Terminal
No.Condition Terminal
voltage
51
1 !
Throttle-posrtlon sensor signal During idleo-1v
When fully open5v
/ When there is damaged or disconnected wiringIov I
Checking the throttle-position sensor circuit (with the connector disco\
nnected) Terminal Connection
destrnation or MeasurementNo measured part Tester connection
Check condition
Standard
51Throttle-positron
sensor Resistance
51 -ground Change according to the throttle0.5-5 k0opening should be smooth and
within the standard value range shown at the right.
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33B-40 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
[9] STEERING ANGULAR-VELOCITY SENSOR CIRCUIT
\ k=3 -2
Steering angular-veloclty sensor- m0439
Photo-Interruptor B/12A0208
F-19ECU
heel
anoular- 1
F-06
pT$q
pFlz$EJ c-07
A
d2 7
I!
t
ii --
ii -I
7 aC-68
12 3
P4r _ v n
w jTT~jR-$+j 1
Steering angular-velocity sensor
-1
12AO411
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting 33B-41
Operation
The slitted disc installed to the steering shaft
inter-
rupts, or allows light to pass with the result that
electric signals corresponding to the
angular-veloci-
Diagnostic
If there is damage or disconnection of the heavy-line
circuit, the alarm light illuminates and control is as ty of the steering wheel movement are detected
and passed to the ECU.
described in the table below.
Diagnostic No. Attitude control Damping force
control Vehicle-height
control
HIGH
Switch acceptance
SPORT AUTO
SOFT
I
21Control stop Held at MEDIUM
Held at NORM
I
Not accept
vehicle height.
I
Service data indication
Code No. Indication
Display
21Indicates the ON or OFF status21: STEER. SNSR. ST1 ON/OFF ST2 ON/OFF
individually for STR 1 and STR. 2.
ECU terminal voltages (when connector is connected)
TerminalNo.Signal Condition Termrnal
voltage
25 Power source for sensor
When the ECU is activated
5v
53Steering angular-velocity sensor (1)When the photo-interruptor is ON
o
v
60
’Steering angular-velocrty
sensor (2)When the photo-interruptor is OFF3.5y
When there is damaoe or disconnection of the harness5v
-“.
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36Sensor circuit
ground Constantly ov
Checking the steering angular-velocity sensor circuit (with the connect\
or disconnected)
Terminal Connection destination or MeasurementNo.measured partTester connection
Check condition
Standard
Steering angular-velocity Resistance
sensor power-supply
circut
25-36 Connect the tester’s t-i probe to
Continuity
terminal 25, and the (+ ) probe exists. (Theto terminal 36. indicator
Note: fluctuates
Even
If the result is good, the
sensor must not be judged to be
working.
Steering angular-velocity Resistance
sensor 53-36
Turn the steering wheel slowly.
NocontinuityIContinuity

33B-42
ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
IO] FRONT-HEIGHT SENSOR CIRCUIT
.ever
Seysor
,..e
Relationship between N (normal vehicle height) and othervehicle-height levels
High 1
Normal 50
(1.97)
40(1.57)
30(1.18)
201.791
10C.39)
0
tEH (highest)._--
HH (higher than HIGH)
H (HIGH vehicle height)
NH (higher
than NORM)
N (NORMAL vehicle height)
EL (lowest) A-27
[Unit: mm
(in.11
Front-helghf
sensor
Operation
The front-height sensor detects (by detecting the
sistors, and the slits in the disc thus interrupt, or let
relative position of the body and the front axle) the
action movements (bouncing, nose diving, etc.), pass, the light beams between the light-emitting
diodes and the photo-transistors. By employing the data gathered in this way, the
sen-
sor can detect the vehicle height as any one of the
nine level classifications.
and the vehicle height, of the front of the vehicle,
The rotating disc plate rotates in the area between
four pairs of light-emitting diodes and photo-tran-
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