Mitsubishi 1989-1993 GALANT Service Manual page 1008

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Operation
The rear air-supply valves are switched ON (opened)
for air supply to the left and right air springs during
attitude control and during vehicle-height adjust-
ment upward.
Diagnostic
If there is damage or disconnection of the heavy-line
circuit, or a malfunction of an output transistor
E C U , t h e
w i t h i n t h e a l a r m l i g h t i l l u m i n a t e s , a n d
Diagnostic No.
51 Control stop
Actuator compulsory activation
The rear air-supply valves are activated by the
following.
Code No Applicable operation
08
Rolling control (left turn)
09
Rolling control (right turn)
10
ECU terminal voltage (when connector is connected)
Terminal
No.
30 Rear alr-supply valve
activation signal
Checking the rear air-supply valve activation circuit (with the connector disconnected)
Terminal Connection destination or Measurement
No. measured part
Rear air-supply valve
30
Troubleshooting hints (mechanical malfunctions)
Malfunction
Malfunction probable cause
mode
Stuck in the Air cannot be supplied in because
OFF (closed) the valve stuck in the OFF (closed)
IS
due to corroson. freezrng, etc.
caused by moisture penetration.
Stuck in the Air supply cannot be stopped
because the valve is stuck in the ON
ON (open)
position (open) due to corrosion, freezing,
etc. caused by moisture penetration.
Air leakage at Valve seat is worn.
the valve
seat
Wear, etc. of the O-ring, etc
to
atmosphere
Usually, and during air exhaust, these valves are
OFF (closed). Note that the rear-pressure sensors,
for detection of the internal pressure of the rear
shock absorbers, are installed in thesevalves.
control is as described in the table below.
Note that the malfunction-detection circuit is the
same for the front air-supply valves.
Damping force
control
Held at MEDIUM Control stop
When the rear air-supply valves are ON (open)
When the rear arr-supply valves are OFF (closed)
During fail-safe (for solenoid valve power source relay switch OFF)
Tester connection
The rear vehicle-height will not increase
l
Insufficient control of rolling and squat.
l
The rear vehicle-height decreases after rolling
l
control.
The rear vehicle-height increases and the body tilts
to one side
When left as is, the rear vehicle-height increases
l
The rear vehicle-height downward adjustment
l
frequency increases.
When left as IS, the rear vehrcle-height decreases
l
Air is not accumulated in
l
The compressor is activated too frequently.
l
TSB Revision
Switch acceptance
control
HIGH SPORT
Condition
Check condition
Constantly
Malfunction
the high-pressure tank
AUTO SOFT
Not accept
Terminal
voltage
o v
o v
Standard
Approx. 1012
Note
Diagnostic No.56
output
Very slrght leakages can-
not be detected Such
leakage is detected a long
ase of the vehicle height