Toyota 4A-FE Repair Manual page 115

Fl-46
No.
Terminals
8
THW - E2
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter
Trouble
No voltage
IG SW ON
Condition
Coolant temperature 80°C
(176°F)
ECU
STD voltage
0.4 - 0.7
v
Water
Temp. Sensor
+B {+81)
,,_.--c~E=2'--~~~~~~~~~~~~~~~--0E2
---
.-------<
1
E 1
F1 35 72
CD
Q)
There is no voltage between ECU terminals THW and E2 .
(IG SW ON)
-
(t
Check that there is voltage between ECU terminal +B
(+
B 1)
and body ground. (IG SW ON)
OK
l
NO
Fl4050
Refer to +B - E1
trouble section (No.1).
(See page Fl-39)
Voltmeter
~eek
wiring between ECU terminal E1 and body ground.
I
,---- i __ j
0
OK
!
BAD
@Check water temp. sensor.
(See page Fl-1 38)
Repair or replace.
Fl4039
BAD
j
OK
Replace water Check wiring between ECU and water
temp. sensor. temp. sensor.
Ohmmeter
DD
l
OK
IBAD
•
Try another ECU . Repair or replace.
F14255