1995 TOYOTA SUPRA Service Repair Manual

Page 65 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Remove magnetic clutch relay from R/B No. 2.
Check continuity between each pair of terminals
shown below of magnetic clutch relay.
Terminals 1 and 2
Terminals 3 and 5
Terminals 3 and 5
No continuity

Page 66 of 2543

TOYOTA SUPRA 1995  Service Repair Manual A C Control Assembly Circuit
CIRCUIT DESCRIPTION
This circuit includes the control switch circuit and the LED circuit in the A/C control Assembly.
The A/C amplifier always searches which switch is ope

Page 67 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
Check the each LED lights up when the applicable switch is operated.
Proceed to next circuit inspection shown on matrix
chart (See page AC±26).
Check voltage between terminal for

Page 68 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Repair or replace A/C control assembly.
Check and replace A/C amplifier.
SwitchCheck result
 ON
 OFFNo continuity
 Continuity
Remove A/C control assembly and disconnect con
nectors.
Check continuity o

Page 69 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Temperature Set Dial Circuit
CIRCUIT DESCRIPTION
When temperature set dial is turned, the voltage of TSET terminal will change. A/C amplifier searches for this
change and controls the room temperature

Page 70 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
Check voltage of TSET terminal on A/C amplifier.
Check voltage of terminal on A/C control assembly.
Check harness and connectors for S5 and SG signal.
Proceed to next circuit insp

Page 71 of 2543

TOYOTA SUPRA 1995  Service Repair Manual REFRIGERANT SYSTEM INSPECTION WITH MANIFOLD GAUGE SET
This is a method in which the trouble is located by using a manifold gauge set.
(See ªUSE OF MANIFOLD GAUGE SETº on page AC±11)
Read the manifo

Page 72 of 2543

TOYOTA SUPRA 1995  Service Repair Manual 2.  MOISTURE PRESENT IN REFRIGERATION SYSTEM
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
During operation, pres±
sure on low pressure 
side sometimes 
becomes a vacuum and
some