Mitsubishi 1989-1993 GALANT Service Manual page 1006

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Operation
The front air-supply valves are switched ON (open-
during attitude control and during vehicle-height ad-
justment upward.
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
51 Control stop
Actuator compulsory activation
The front air-supply valves are activated by the
f o l l o w i n g .
Applicable operation
0 8 1 Vehicle herght upward adjustment
09
Rolling control (right turn)
ECU terminal voltage {when connector is connected)
Terminal
Signal
No
21 Front atr-supply valve
activation signal
Checking the front air-supply valve activation circuit (with the connector disconnected)
T e r m i n a l C o n n e c t i o n d e s t i n a t i o n o r M
No. measured part
21 Front air-supply valve
Troubleshooting hints (mechanical malfunctions)
Malfunction
Malfunction probable cause
mode
Stuck in the
OFF (closed) the valve stuck in the OFF (closed)
IS
position due to corrosion, freezing, etc
caused by morsture penetration
Stuck in the Air supply cannot be stopped
ON (open) because the valve is stuck in the ON
(open) due to corrosron. freezing,
etc. caused by morsture penetratron.
Air leakage at Valve seat worn,
IS
the valve
seat
Wear, etc of the O-ring, etc.
to
atmosphere
Usually, and during air exhaust, these valves are
OFF (closed).
Note that a check valve is provided in these valves in
order to prevent reverse flow of the air.
control is as described in the table below.
Note that the malfunction-detection circuit is the
same for the rear air-supply valves.
Damping force Vehicle-height
control
Control stop
I
When the front air-supply valves are ON (open)
When the front arr-supply valves are OFF (closed)
During fail-safe (for solenoid valve power source relay switch OFF]
e a s u r e m e n t Tester connection
21 -ground
The front vehicle-height will not increase.
l
Insufficient control of rolling and braking dive
l
The front vehicle-height decreases after rolling
l
control.
The front vehicle-height increases and the body tilts
to one side
When left as is, the front vehrcle-height increases.
l
The front vehicle-height downward adjustment
l
frequency increases.
When left as IS. the front vehicle-height decreases.
l
Air is not accumulated in the high-pressure tank.
l
The compressor is activated too frequently.
l
TSB Revision
Switch acceptance
control
HIGH SPORT
Check condition
Constantly
Malfunction
SOFT
AUTO
Not accept
voltage
o v
o v
Standard
Approx. 1011
Note
Diagnostic No.56
output
Very slight leakages can-
not be detected Such
leakage is detected a long
ase of the vehicle height