Mitsubishi 1989-1993 GALANT Service Manual page 998

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Diagnostic
If there is damage or disconnection of the heavy-line
circuit, or a short-circuit, or a malfunction of the out-
p u t t r a n s i s t o r w i t h i n t h e E C U , t h e a l a r m l i g h t
Diagnostic No.
Attitude control
44 Rolling control only
stops.
Actuator compulsory activation
Applicable operation
06
Return pump relay ON
ECU terminal voltages (when connector is connected)
3 2 Return pump relay activation signal
Checking the return pump drive circuit (with the connector disconnected)
measured part
32 Return pump relay
NOTE (Refer to Vol.2 GENERAL for the circuit diagram.)
Procedures for changing the internal pressure of the low-pressure tank
Short-circuit the battery power-source @ terminal to the return pump relay @ terminal in order to activate the return
pump for a few seconds, and then leave as is.
the
Short-circuit battery power-source @ terminal to the front intake-air solenoid @I terminal and the front right
solenoid @I terminal in order to connect the high-pressure tank and low-pressure tank, and then leave as is for a few
seconds.
Procedures for changing the internal pressure of the high-pressure tank
Short-circuit the battery power-source @I terminal to the discharge-air solenoid (for vehicle-height adjustment) @I
terminal, the front intake-air solenoid @I terminal and the front right solenoid @ terminal and the front discharge-air
solenoid @I terminal in order to release the atmosphere inside the high-pressure tank, and then leave as is for a few
seconds.
Short-circuit the battery power-source @ terminal to the compressor relay @ terminal in order to activate the
compressor for a few seconds, and then leave as is.
Troubleshooting hints (mechanical malfunctions)
Malfunction
mode
The return pump relay contacts are shorted.
The return pump
relay is fused
The return pump won't operate due to short-
The return pump is
stuck.
Damping force
control
Held at
MEDIUM
The return pump relay is compulsorily switched ON for a period of three seconds.
When the return pump relay is ON
When the return pump relay is OFF
During fail-safe
(solenoid valve power source relay switch OFF)
Tester connectron
Resistance
Malfunction probable cause
TSB Revision
illuminates and 'control is as described in the table
below. (Note that the diagnostic is only applicable
up to the compressor relay.)
Vehicle-height
control
HIGH
Rolling control only
Check condrtron
Constatly
Next apply battery voltage to
terminal 32.
Malfunction
The return pump won't stop, causing the
battery to discharge.
* Insufficient attitude-control effect.
Vehicle height increases after rolling control.
l
Switch acceptance
Not accept
Terminal
voltage
o v
o v
Standard
Approx 750
Return pump
operation
1
Note