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
psi) or lower, the high-pressure
switch is switched ON, and as a result the ECU
sends the drive signal to the compressor.
Conversely, when the pressure of the high-pressure
tank becomes 950
(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.
Service data indication
Code No
15
Indicates the ON/OFF status of the
high-pressure switch.
15: HIGH PRESS. SW. ON/OFF
ECU terminal voltages (with connector connected)
Terminal
No.
Signal
Condition
T e r m i n a l
I
59
High-pressure tank pressure signal
When high-pressure switch is ON (low pressure)
o v
When high-pressure switch is OFF (high pressure)
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
e a s u r e m e n t
No
measured part
Tester connection ,
Check condition
Standard
59
switch
59-36
High-pressure tank internal
pressure
760
(108 psi) or
lower
Continuity
High-pressure tank internal
pressure 950
(135 psi) or
higher
No
Troubleshooting hints
mode
Malfunction probable cause
Malfunction
Note
TSB Revision
Harness
damage or
Harness wiring damage or disconnection, or
Improper switch contact
Compressor doesn’t operate.
Harness
Air leakage.
Harness short-circuit, or switch short-circuit,
worn or damaged.
Compressor operates without
Diagnostic
output.
Rolling control
of Incompatibility. very
freauent
of compressor.
Summary of Contents for 1989 Galant
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