Toyota Supra 1990 Manual page 203

1.
2.
Fusible
Link
EFI SYSTEM - Diagnosis System
INSPECTION OF DIAGNOSIS CIRCUIT
ECU
.----------------------¢BATT
.------~+B
,-~~------~--~~--~---,Lif-~+---~~----~+Bl
Fusible Link
Fuse
AM230A EFI l5A
,-----\--<:iltiI'o--iL------------¢ M- R E L
Ignition Switch-
Fuse
LA~M~r-(~I~G~2
____
~~
____________
~IGSW
t-----"F""us::,..:i b)-I_e -{L""i n::,(k>----__
-+-c
r
o-+I_G_1 ___
I G--<jN,7,D-' 5_A_----f'
' } - - - - - < ; l
W
ALT 100A AMl 40A
MAIN 2.0L
GAUGE 7.5A
"CH ECK" Engine
Warning Light
Battery
i
,-----------~
TE 1
TE1
~
Does "CHECK ENGINE" warning light
come on when ignition switch is at ON?
~NO
Check
Connector
YES
,----~-~
El
System Normal
FI-29
FI3611
Does "CHECK ENGI NE" warning light
YES Check wiring between OK
Try another
come on when ECU terminal W is grounded ECU terminal E
1
and
to the body?
body ground.
ECU.
JNO
j
BAD
Check bulb, fuse and wiring between ECU
Repair or replace.
and ignition switch.
t
BAD
Repair or replace.
Does "CHECK ENGINE" warning light go
YES
System Normal
off when the engine is started?
~NO
Check wiring between ECU and "CHECK
BAD
Repair.
ENGINE" warning light.
~OK
Is there diagnostic code output when check
NO
Check wiring between ECU terminal TE 1 and
connector terminals TE1 and E1 are check connector terminal TE1 , and ECU ter-
connected? m inal E 1 and check connector term inal E 1 .
t
YES
t
OK
Does "CHECK ENGINE" warning light go
NO
Try another
out after repair according to malfunction Further repair required.
ECU.
code?
t
YES
System OK
I
·1
Cancel out diagnostic code.
I
I