Toyota Celica Supra 1986 Service And Repair Manual page 145

EFI SYSTEM - Troubleshooling for EFI Eleclronic Circuil w ilh Voi1/ 0hmme1er
Fl-43
.
No.
Tenninal Trouble
Condltk)n
STD
Voltag<~
8
ISCo - ISC.- Eo
No voltaSJ&
Ignition sw ftch ON
9 -
14V
ECU
ISC ,
ISC
2
ISC,
ISC Valve
1 1 1
ISC,
No. 1 Main Refay
r.
Fusible L ink
Fuse
~
r
1
JlJ
IG S/W
'
• B
' Bettery
.
'
-
M-AE L
l
-~ '-
e,
~
,101~
<D
There is no voltage between ECU te(minals
ISC
1 -
ISC• and E '·
uo srw
ON)
a>
Check that there is vohage t>etwee.n
ecu
terminal
+
8
and body ground. UG SIW ONI
NO
OK
Check wiring between computer terminal E•
and body ground.
ECU
®
OK
BAD
Try another ECU.
Repair or replace
v
Refer t o No. 1.
I
NO
I
Repair or replace
OK
®
Check wiring between NO. 1 main
BAD
Repair or replace
relay and battery.
OK
(®
Chectc: ISC valve.