Toyota Supra 1990 Manual page 283

Fusible
Link
Battery
.,...
,
..L
EFI SYSTEM -
Electronic Control System
Fusible Link
AM230A
MAIN 2.0L
EFI Main Relay
Fuse
EFI 15A
ECU
EFI Main Relay
, - - - - - - 0
+B
~\---~-----Q
+B 1
.--+~ooa'~r--------o
M-REL
FI-109
FI3566
- - 7
INSPECTION OF EFI MAIN RELAY
F 11698
No continuity Continuity
[=z[J
OCJ
Continuity
DO
o
o
Battery
®
8
BE0010
1. CHECK OPERATION OF MAIN RELAY
Turn the ignition switch ON. At this time an operation noise
will occur from the relay.
2. INSPECT RELAY CONTINUITY
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 3.
(b) Check that there is no continuity between terminals
2 and 4.
If continuity is not as specified, replace the relay.
3. INSPECT RELAY OPERATION
(a) Apply battery voltage across terminals 1 and 3.
(b) Check that there is continuity between terminals 2 and
4.
If operation is not as specified, replace the relay.