Toyota Celica Supra 1986 Service And Repair Manual page 141

EFI SYSTEM - Troubleshooling for EFI Eleclronic Circuit with Voii/Ohmmeler Fl-39
No.
Tonninals
T rou.ble
Condition STO
Volt-
4 THW- Ea No voltage
Ignition sw ttch Coolan1 temperat!Jfe 80° C
0 .1 - 0 .6
v
ON (178° F)
ECU
Wa1er Temp. S.ns.or
• 8
r-
I.
THW
E,
...._
E,
..,:-
"""
Q)
(j)
There Is no voltage between ECU terminals THW and E2.
ECU
IIG
SIW ONJ
(2)
Check
that there is voltage bet'wHn
ECU t
erminaJ +
8 end body
v
ground. (10 SIW ONI
OK NO
......
0>
Check
water temp .• sensOr.
Refer to No. 1 .
ECU
<:)
BAD
OK
Repleee water
Check wiring between ECU end
temp. sensor.
water temp, sensor.
OK BAD
v
I
Try another ECU.
I
Repail
Of
repaee
wiring.