Toyota Supra 1990 Manual page 226

FI-52
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GTE)
No.
Terminals Trouble
Condition
STD Voltage
BATT - E1 No voltage --
10 -14 V
IG SW
-
E1 No voltage Ignition switch ON
10 -14 V
1
M-REL
- E1
No voltage Ignition switch ON
10 -14 V
+B(+B1)
-
E1 No voltage
Ignition switch ON 10 -14 V
ECU
BATT
EFI Main Relay
Fusible Link
Fuse
~
1
+B1
.-
-
+B
AM230A EFI 15A
(
J
M-REL
Fusible , MAIN 2.0L
l-
,
..
Link
~ Ignition Switch
-
Fuse I
~~
I
AM21 JIG2
IGSW
IGN 7.5A
~;;:-
Battery ;-
....L.
r
E1
- -
FI3610
CD
• BATT - E1
ECU
CD
There is no voltage between ECU terminals BATT and E1.
ell
Check that there is voltage between ECU terminal BATT and body
ground.
NO
~
OK
FI2753
®
Check wiring between ECU terminal E1 and body
ground.
ECU
ell
~
OK
~
BAD
Try another ECU.
Repair or replace.
Check fuse and fusible links.
BAD
Replace.
OK
Check wiring between ECU BAD
terminal and battery.
Repair or replace.
®