1989 MITSUBISHI GALANT Service Repair Manual

33B-6ACTIVE-ELECTRONIC CONTROL SUSPENSION - Specifications
Items
Air compressor Air compressor mounting bolt
Arr tube to air compressor
Compressor mounting bracket to transaxle
Solenoid valve and dryer Front solenoid valve bracket to body
Front solenoid valve to bracket
Air tube to dryer Flow control solenoid valve to body
Rear solenoid valve bracket mounting nut
Rear solenoid valve to bracket
Air tube
Joint
ieight sensor
Front height sensor rod to sensor
Front height sensor rod to lower arm
Front height sensor rod jam nut
Protector to body
Rear height sensor to body
Rear height sensor rod to sensor
Rear height sensor rod to bracket (1989 models)
Rear height sensor rod to bracket (From 1990 models)
Rear height sensor bracket (A) to bracket
(B)
Front height sensor rod jam nut
; sensor
G sensor bracket to body
Nmftlbs.
4-
6
3-4
8-106-
7
9-14
7-10
7-l 15-
8
7-11 5-8
8-106-
7
7-l 15-

8
4-6 3-4
7-l 15-
8
8-106-

7
17-26 12-19
17-26 12-19
9-14
7-10
9-1
4
7-10
9-1

4
7-10
4.8-7.2
4-
5
17-26 12-19
4.8-7.2 4-5
9-14
7-10
9-1
4
7-10
4-

6
3-4
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ACTIVE-ELECTRONIC CONTROL SUSPENSION - Special Tools336-7
SPECIAL TOOLSM33DA-A
NumberName I Use
djustment Procedures
For the number, refer to
tr pressure gauge
OPTIONAL.
AVAILA
OPTIONAL: AVAILABLE FROM O.T.C.
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33B-8ACTIVE-ELECTRONIC CONTROL SUSPENSION - Special Tools
ToolNumberNameI Use (MB991237,

MB9912381Compression of the rear coil spring (MB991237,
MB9912391
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33B-9
NOTES

33B-10 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Ifagnosticervice
- ata 0utDut
Diagnostic service
data switching input
Simulated
vehicle-speed input
Ground
1 Cl nno,
TROUBLESHOOTINGhw3EAAtm
TROUBLESHOOTING POINTS
REGARDING THE DIAGNOSTIC FUNCTION
For the ACTIVE-Electronic Control Suspension (ACTIVE-ECS),
the electronic control unit has been provided with the following
functions in order to make checking of the electronic-control system
easier.
(1) Diagnostic trouble code output
(2) Service data output(3) Actuator test
Note that all of the above can be checked by using the
scan tool.
Also note that the diagnostic trouble codes can be checkedby using the voltmeter.
NOTE
For information concerning testing procedures by using the
scan tool, refer to
P.33B-11.
CHECKING THE ELECTRONIC CONTROL UNIT (ECU) SIG- NAL CIRCUIT
(1) The circuit tester used must be highly sensitive and highly precise, with internal batteries of
3V or more.
(2) Care should be taken about the outflow of current from the tester when checking for continuity of terminals and the
power-supply circuitry for the photo sensors (front and rearheight sensors and steering angle velocity sensor). Use of
the
x10 range is preferable, but the xl range can be used
if the indicator does not move sufficiently to the right.
(3) The resistance values noted as standard values are simply reference values. If there is continuity, the part can be
considered to be OK.
(4) If a power relay or solenoid valve is to be activated, first check carefully to be sure that there is no damaged or
disconnected wiring or a short-circuit. Also do not make
unnecessary connections so that wiring contacts the body.
Take particular care to be sure that the wiring of battery power-supply connections is secure.
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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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33B-12 ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Diagnostic
troubleMalfunction Vehicle condition
Probable causeAction
code No.
An abnormal signal (a signal
The alarm light illuminates, l Front height sensor
Troubleshoot
unlike any normal
srgnaland the attitude-control malfunction.
ing hints
such as an error code, etc.) function and the
vehicle-l Damaged or disconnected classified by
is input from the front height control function are wiring, or a short-circuit, of circuit [IO]
height sensor; or, a stopped. The damping the front height sensor
“22 malfunction of the
force is held to MEDIUM. circuit.
vehicle-height
NOTEl Disconnection of the
discrimination circuit within
the ECU.Note that 32 seconds are connector of the front
required to determine that height sensor circuit.
there is a malfunction. l ECU malfunction.
“23 An abnormal signal is input
The alarm light illuminates,
l Rear height sensorTroubleshoot
from the rear height sensor; and the attitude-control malfunction.
ing hints
or, a malfunction of the function and the vehicle
l Damaged or disconnected classified byvehicle-height
height control function are
wiring, or a short-circuit, of circuit
[I 11
discrimination circuit within
stopped. The damping the rear height sensor
the ECU.force is held to MEDIUM circuit.
NOTEl Disconnection of the
Note that 32 seconds are connector of the rear
required to determine that
height sensor circuit.
there is a malfunction. l ECU malfunction
There is damaged or The alarm light illuminates, l Malfunction of the Troubleshoot-
disconnected wiring, or a and the attitude-control vehicle-speed sensor
ing hints
short-circuit, of the function stops. The (damaged or disconnected classified by
vehicle-speed sensor Input
damping force
IS held to wiring, or a short-circuit).
circuit [ 121
circuit.MEDIUM, and the vehicle l Damaged or disconnected
“24 (The throttle is open 30% or
height is held to NORMAL. wiring, or a short-circuit, of
more, and the output of the the vehicle-speed sensor
generator “L”
terminal is circuit.
HIGH level, but even so the l The connector of the
input of the vehicle-speed vehicle-speed sensor
pulses is not
30*’ seconds circuit is disconnected.
or longer.)l ECU malfunction.
There is damaged or The attitude-control
l Rear pressure sensorTroubleshoot.
disconnected wiring of function and the
vehicle-malfunction.
ing hints
/ the rear pressure height control function arel Damaged or disconnected classified by
sensor input circuit. stopped. wiring, or a short-circuit, of
circuit
[I31
(The rear internalThe damping force is held the rear pressure sensor
25pressure is abnormally
to MEDIUM. circuit.
high.)
NOTEl Disconnection of the
This code is also output connector of the rear
during driving in an pressure sensor circuit.
overloaded condition. l ECU malfunction
NOTE+1: 1989 models
From 1990 models: 60
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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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