Toyota Supra 1990 Manual page 207

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter (7M-GEI
FI-33
No. Terminals Trouble Condition
STD Voltage
BATT
- E1
No voltage
- -
10 -14 V
IGSW
-
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 I gnition switch ON 10 -14 V
ECU
BATT
EFI Main Relay
Fusible Link
Fuse
L:::\
1
+B1
"~
( J
+B
AM230A
EFI 15A
M·REL
Fusible ~~
Link
~
, MAIN 2.0L
Ignition Switch
-
AM21
~_ IIG2
Fuse
-
IGSW
I
I
IGN 7.5A
Battery
T
,
-'-
r
E1
-
-
-
FI3610
Q)
• BATT- E1
ECU
BATT
CD
There is no voltage between ECU terminals BATT and E
1.
ell
Check that there is voltage between ECU terminal BATT and body
ground.
NO
~
OK
FI0309
®
Check wiring between ECU terminal E1 and body
ground.
ECU
BATT
~
OK
~
BAD
Voltmeter
Try another ECU. Repair or replace.
Check fuse and fusible links.
BAD
Replace.
FI0310 OK
Check wiring between ECU BAD
terminal and battery.
Repair or replace.
®
FI0311