1995 TOYOTA SUPRA Service Repair Manual

Page 1977 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Check EFI main relay.
Remove EFI main relay from R/B No.2.
Check continuity between terminals of EFI main
relay shown below.
Replace EFI main relay.
(1) Apply battery voltage between terminals 1
and 2

Page 1978 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Back Up Power Source Circuit
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is off for use by
the diagnostic trouble code memory and

Page 1979 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
Check EFI No.1 Fuse.
Remove EFI No.1 fuse from R/B No.2.
Check continuity of EFI No.1 fuse.
Continuity
Check for short in the harness and all the com-
ponents connected to EFI No.

Page 1980 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Injector Circuit
CIRCUIT DESCRIPTION
The injectors are located in the intake manifold. They inject fuel into the cylinders based on the signals
from the engine control module.
INSPECTION USING OSCILLO

Page 1981 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
(See page EG±404)
Check voltage between terminals # 10 ~ 60 of engine control module and
body ground.
(1) Connect  SST check harness ªAº).
(See page EG±404)
SST 09990±01000
(

Page 1982 of 2543

TOYOTA SUPRA 1995  Service Repair Manual (See page
EG±202)
Check for open in harness and connector between terminal E)1, EO2 of ECM
connector and body ground (See page 
IN±30).
Disconnect injector connector. (See page EG±202)
Measure resi

Page 1983 of 2543

TOYOTA SUPRA 1995  Service Repair Manual CIRCUIT DESCRIPTION
The IAC valve is situated on the intake chamber. Intake
air bypassing the throttle valve is directed to the IAC
valve through a passage.
A step motor is built into the IAC valve. I

Page 1984 of 2543

TOYOTA SUPRA 1995  Service Repair Manual EG±476± ENGINE2JZ±GE ENGINE TROUBLESHOOTING