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.
These valves are usually,
Diagnostic
and during air intake, OFF (closed), and are ON
(open) during exhaust.
If there is damage or disconnection of the heavy-line
control is as described in the table below.
circuit, or a malfunction of an output transistor
Note that the malfunction-detection circuit is the
within the ECU, the alarm light illuminates, and
same for the left front and right front valves.
Diagnostic No.
52
Damping force
Switch acceptance
Attitude control
control
control
HIGH
SPORT
AUTO
SOFT
Control stop
Held at MEDIUM
Control stop
Not accept
Actuator compulsory activation
The left front and right front valves are activated by
the following.
Code No.
Applicable operation
Vehicle height
adjustment
09.10
Rolling control (left turning: left
control
turning: right valve)
ECU terminal voltages (when connector is connected]
No
Condition
Terminal
voltage
3
Left front valve
When the left/right front valves are ON
When the left/right front valves are OFF
o v
4
Right front valve
During fail-safe (for solenoid valve power source relay switch OFF)
o v
Battery positive voltage
Checking the left front/right front valves activation circuit (with the connector disconnected)
Connection destination or
measured part
Tester connection
Check condition
Standard
3
Left front valve
Constantly
Approx
4
Right front valve
Resistance
Constantly
Approx
Troubleshooting hints (mechanical malfunctions)
mode
Stuck the
OFF (closed)
position
Stuck the
ON (open)
Air leakage
at valve seat
Air leakage
atmosphere
Malfunction probable cause
Malfunction
Note
cannot be discharged because
l
the valve is stuck in the OFF (closed)
The left front and right front vehicle height
due to corrosion, freezing, etc.
increases after rolling control.
Insufficient active control effect.
caused by moisture penetration.
Air cannot be taken in because the
l
valve is stuck in the ON (open) due
The left front and right front vehicle height
Diagnostic trouble
decreases, and the body tilts to one side.
to corrosion. freezing, etc. caused
code
is output.
l
The return pump is activated too frequently.
by moisture penetration
Valve seat is worn
Wear, etc of the O-ring, etc
When left as is, the front vehicle-height will
decrease.
Diagnostic trouble
code
is output.
When left as is. the front vehicle-height will
decrease.
Very slight leakages
not be detected. Such
leakage
IS
detected a long
time
afterward by a decre-
ase of the vehicle
TSB Revision
Summary of Contents for 1989 Galant
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