Mitsubishi 1989-1993 GALANT Service Manual page 1010

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Operation
The left front and right front valves are for switching
the air intake and exhaust for the left front and right
front strut air springs.
Diagnostic
If there is damage or disconnection of the heavy-line
circuit, or a malfunction of an output transistor
within the ECU, the alarm light illuminates, and
Diagnostic No.
Attitude control
52 Control stop
Actuator compulsory activation
The left front and right front valves are activated by
the following.
Code No. Applicable operation
Vehicle height aownward adjustment
Rolling control (left turning: left valve)/rolling
09.10
control (rrght turning: right valve)
ECU terminal voltages (when connector is connected]
No
3
Left front valve activatron
4 Right front valve activatron
Checking the left front/right front valves activation circuit (with the connector disconnected)
measured part
3 Left front valve
4 Right front valve
Troubleshooting hints (mechanical malfunctions)
Malfunction probable cause
mode
Stuck In the
OFF (closed) the valve is stuck in the OFF (closed)
position
due to corrosion, freezing, etc.
caused by moisture penetration.
Stuck In the Air cannot be taken in because the
ON (open)
valve is stuck in the ON (open) due
to corrosion. freezing, etc. caused
by moisture penetration
Air leakage
Valve seat is worn
at valve seat
Air leakage tc Wear, etc of the O-ring, etc
atmosphere
These valves are usually,
Damping force
control
Held at MEDIUM
When the left/right front valves are ON
During fail-safe (for solenoid valve power source relay switch OFF)
Tester connection
Resistance
The left front and right front vehicle height
l
increases after rolling control.
The left front and right front vehicle height
l
decreases, and the body tilts to one side.
The return pump is activated too frequently.
l
When left as is, the front vehicle-height will
decrease.
When left as is. the front vehicle-height will
decrease.
TSB Revision
and during air intake, OFF (closed), and are ON
(open) during exhaust.
control is as described in the table below.
Note that the malfunction-detection circuit is the
same for the left front and right front valves.
control
HIGH
Control stop
Condition
Check condition
Constantly
Constantly
Malfunction
Switch acceptance
SOFT
SPORT AUTO
Not accept
Terminal
voltage
o v
o v
Standard
Approx 1012
Approx 1012
Note
Diagnostic trouble
code No.56 is output.
Diagnostic trouble
code No.56 is output.
Very slight leakages can-
not be detected. Such
leakage detected a long
IS
time
afterward by a decre-
ase of the vehicle height