Toyota 4A-FE Repair Manual page 110

EFI SYSTEM - Troubleshooting with Volt/Ohmmeter
Fl-41
: No.
Terminals Trouble Condition
STD voltage
IDL - E2
Throttle valve open 4.5 - 5.5
v
3
No voltage
IG SW ON
PSW - E2
Throttle valve fully closed
4.5 - 5.5
v
ECU
+B (+81)
-c....,;l~DFL~~~~~~~~~~~~~~~~~~~~~~~~---t'JIDL
~--e--::E~2:-:--:-,,---~~~~~~~~~~~~~~~~~~~~~~---t-iE2
~+-=-P=svv..;..;._~~~~~~~~~~~~~~~~~~~~~~---!'iPS'W
Throttle Position Sensor
Voltmeter
I
v
I
Throttle Position Sensor
PSW
CD
Fl444 7
; ,1
Fl4039
E2-U"'""IW!-L.-L-_ / /
--..or---~...;....~~~~-
1 D L
Fl4439
E1
F10984
CD
There is no voltage between
ECU
terminals
IDL and
E2.
(IG SW ON) (Throttle valve open)
(V
Check that there is voltage between ECU terminal +B (+81
l
and body ground. (IG SW ON)
NO
iOK
Check wiring between ECU terminal E 1 and body
ground.
(oK
BAD
I
Try another ECU.
I
Repair or replace.
Refer to +B - El
BAD
trouble section. (No.1)
~
Repair or replace.
(See page Fl-39)
!OK
®
Check throttle position
sensor. {See page Fl-1 23)
BAD
t
OK
BAD
I
Repair or replace Check wiring between ECU and
throttle position sensor. throttle position sensor.
l
OK
Try another ECU.
I
I