Mitsubishi 1989-1993 GALANT Service Manual page 970

ACTIVE-ELECTRONIC CONTROL SUSPENSION - Troubleshooting
Operation
The high-pressure switch is switched ON and OFF
by the pressure in the high-pressure tank, and as a
result the ECU functions to control the activation
and stop of the compressor.
When the pressure in the high-pressure tank be-
comes 760 kPa (108 psi) or lower, the high-pressure
switch is switched ON, and as a result the ECU
sends the drive signal to the compressor.
Service data indication
Code No
15
Indicates the ON/OFF status of the
high-pressure switch.
ECU terminal voltages (with connector connected)
Terminal
Signal
No.
59
High-pressure tank pressure signal
Checking the high-pressure switch 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
59
Troubleshooting hints
mode
Harness wlrlng
Harness wiring damage or disconnection, or
damage or Improper switch contact
Harness Harness short-circuit, or switch short-circuit,
Air leakage.
15: HIGH PRESS. SW. ON/OFF
When high-pressure switch is ON (low pressure)
When high-pressure switch is OFF (high pressure)
e a s u r e m e n t Tester connection ,
59-36
Malfunction probable cause
TSB Revision
Conversely, when the pressure of the high-pressure
tank becomes 950 kPa (135 psi) or higher, the
high-pressure switch is switched OFF, and the
compressor is stopped two seconds thereafter.
Note, however, that the compressor is not ac-
tivated, even if the high-pressure switch is switched
ON, if the return pump is in operation. Note also
that there is no diagnostic function for the
high-pressure switch.
Condition
Check condition
High-pressure tank internal
pressure
760 kPa (108 psi) or
lower
High-pressure tank internal
pressure 950 kPa (135 psi) or
higher
Malfunction
Compressor doesn't operate.
Compressor operates without stopplng.
Rolling control feehng of Incompatibility. very
freauent oaeration of compressor.
T e r m i n a l
I
o v
Standard
Continuity
No
Note
Diagnostic
output.