Toyota 4A-FE Repair Manual page 114

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter Fl-45
No. Terminals Trouble
Condition STD voltage
7 THA - E2 No voltage IG SW ON
Intake air temperature 20°C
2.0 - 2.5
v
~
(68°F)
ECU
r
""\
Intake Air Temp. Sensor
>+B (+81)
Voltmeter
G::J
lt
lo
ll ~ ~jo
Ohmmeter
t= n~
r-
k}
L _
THA
E2
CD
F14049
Fl4039
'THA
E2
\E1
-==-
Ii..
~ -
F13572
CD
There is no voltage between ECU terminals THA and E2.
(IG SW ON)
®Check that there is voltage between ECU terminal +B (+81)
and body ground. (IG SW ON)
OK
iNO
Refer to
+
B - E 1
I
trouble section (No.1 ).
(See page Fl-39)
Check wiring between ECU terminal E1
and
body ground.
lOK
I
+
BAD
@Check intake air temp. sensor.
(See page Fl-1 39)
Repair or replace.
!BAD
!OK
Replace intake Check wiring between ECU and intake
air temp. sensor air temp. sensor.
~OK
l
BAD
Try another ECU.
Repair or replace
wiring.