1995 TOYOTA SUPRA Service Repair Manual

Page 1969 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
(EG±463).
Check output condition of diagnostic trouble code 51.
*: Before the STA signal is input (ST is not ON),
diagnostic trouble code 43 is also output.
Diagnostic trouble co

Page 1970 of 2543

TOYOTA SUPRA 1995  Service Repair Manual (See page EG±404)
Check throttle position sensor.
(1) Disconnect  throttle position sensor connector.
(2) Disconnect  the vacuum hose from the throttle
body. than apply vacuum to the throttle opener

Page 1971 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Park Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on the
terminal NSW of the ECM is g

Page 1972 of 2543

TOYOTA SUPRA 1995  Service Repair Manual INSPECTION PROCEDURE
HINT: This diagnostic chart is based on the premise that the engine is being cranked under normal conditions.
If the engine does not crank, proceed to the matrix chart of problem

Page 1973 of 2543

TOYOTA SUPRA 1995  Service Repair Manual ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned on, battery
voltage is applied to the terminals IGSW of the
ECM, and the main relay control circuit in the
ECM sends a s

Page 1974 of 2543

TOYOTA SUPRA 1995  Service Repair Manual (See page EG±404)
Check voltage between terminal +B and E1 of engine control module con-
nector.
(1) Connect  SST (check harness ªAº).
(See page Eg±404)
SST 09990±01000
(2) Turn ignition switch O

Page 1975 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Check IGN fuse.
Remove IGN fuse from J/B No.1.
Check continuity of IGN fuse.
Continuity
Check for short in the harness and all the com-
ponents connected to IGN fuse (See Electrical
Wiring  Diagram).

Page 1976 of 2543

TOYOTA SUPRA 1995  Service Repair Manual Check voltage between terminal M±REL of engine control module connector
and body ground.
Turn ignition switch ON.
Measure voltage between terminal M±REL of en-
gine control module connector and body