Toyota 4A-FE Repair Manual page 113

Fl-44
EFI SYSTEM - Troubleshooting with Volt/Ohmmeter
No. Terminals Trouble Condition STD voltage
PIM - E2
3.3 - 3.9
v
6 No voltage
IG SW ON
VCC - E2
4.5 - 5.5
v
ECU
lE2
E2
.,,
PIM
JPIM
1,,...
VCC
VCC
I
Vacuum Sensor
(Manifold Absolute)
Pressure Sensor ,
1
r
- -
Fl1226
CD
CD
There is no voltage between ECU terminals PIM or VCC and E2 .
(IG SW ON)
Voltmeter
CU
®Check that there is vottage between ECU terminal
+B (+81)
and body ground. (IG SW ON)
r--
· ;:::i
l () :'~oj.1..-~~~-+-+-~-"
NO
!NO
L _
o
Voltmeter
~
0
Ohmmeter
L n
I
!1
c
p
:11
'>1-1--------'----
o
i
- I
!
!(,,._-.:::::://
/
I
I
Fl4048
Fl4039
Fl4040
Refer to +B - E1
trouble section (No.1) .
(See page Fl-39)
·@
Check wiring between ECU terminal E1 and body
ground.
OK
Check vacuum sensor.
(See page Fl-140)
BAD
Replace vacuum
sensor.
Try another ECU.
BAD
Repair or replace.
OK
Check wiring between ECU and
vacuum sensor.
OK
BAD
:iepair or replace .