1995 TOYOTA SUPRA Service Repair Manual

Page 793 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Park Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is put in EXCEPT D RANGE, a signal is sent from the park/neutral position switch to the
ECU. When this signal is input

Page 794 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
Check that the starter operates normally and that the engine starts.
EG±381 or EG±487.)
(See page IN±30).
on page BE±169.
Proceed to next circuit inspection shown on matrix
ch

Page 795 of 2543

TOYOTA SUPRA 1995  Service Repair Manual ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc. Terminal GND and the cruise control
ECU case are grounded.
WIRING DIAGRAM
INSPECTION

Page 796 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Check voltage between terminals +B and GND of ECU connector.
(1)    Turn ignition switch ON.
(2)    Measure voltage between terminals +B and
       GND of ECU connector.
Remove ECU with connectors sti

Page 797 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Back up Power Source Circuit
CIRCUIT DESCRIPTION
The ECU back±up power source provides power even when the ignition switch is off and is used for diagnostic
code memory, etc.
WIRING DIAGRAM
± BODY E

Page 798 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
Check ECU±B fuse.
Remove ECU±B fuse from R/B No.2.
Check continuity of ECU±B fuse.
Continuity
Check for short in all the harness and components
connected to the ECU±B fuse (Se

Page 799 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Main Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control main switch is turned off, the cruise control does not operate.
WIRING DIAGRAM
± BODY ELECTRICAL SYSTEMCRUISE C

Page 800 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Check harness and connector between cruise control ECU and main
switch, main switch and body ground. (See page IN±30).
Proceed to next circuit inspection shown on matrix
chart (See page 
BE±170).
(1