Toyota 4-Runner 1985 Repair Manual page 209

FI-40 EFI SYSTEM - Troubleshooting for EFI Electronic Circuit with Volt/Ohmmeter
No. Terminals Trouble Condition
STD Voltage
J
10
THW - E:;
No voltage
Ignition switch Coolant temperature 80°C
0.5 - 2.5 V
ON
(176°F)
"""\
)+8
Water Thermo
Sensor
~
I
('N'N'.'>
THW
THW
r
E2
E2
-
ECU
Eo!
-
....
Water Thermo Sensor
1P88SH~fT1fB8Ei81
\1
r2v
J:
E
21]
L,_":'IC,,1;, AC'v ~:)W f.(j.\'lLVT.\l~ F:,4WOSPOS'I('f:\
FI0605
CD
CD
No voltage between ECU terminals THW and E
2 •
(lG S/W ON)
®
Check that there is voltage between ECU terminal
+8
and
body ground.
(lG S/W ON)
OK NO
I
@
Check water thermo sensor.
I I
Refer to section 1.
BAD
OK
Replace water
I I
Check wiring between ECU and
thermo sensor. water thermo sensor.
OK BAD
•
Try another ECU.
I
l
Repair or replace
wiring
FI0010