Toyota 4-Runner 1985 Repair Manual page 207

FI·38 EFI SYSTEM - Troubleshooting for EFI Electronic Circuit with Volt/Ohmmeter
No.
Terminals Trouble Condition STO Voltage
Vc - E2
Ignition
-
4-9V
~
Vs - E2
switch Measuring plate fully closed
0.5 - 2.5 V
8
No voltage
ON
Vs - E2
Measuring plate fully open
5-8V
Vs - E2
Idling - 2.5 - 5.5 V
+8
C
r--->- +8
ECU
<
<.
Vc
Vc
:~ Vs
) E2
Vs
E2
Air
Flow
Meter
~
EOI
Air
Flow
Meter
~
[Fc I EIIE21v s
l
vc lvsITHAI
1~r--1...-I ~~LJ 11
1I-.. !-a,alsTAI
VF
!Nswll'",,! WiT IIOLIIG.! I IKNKI N.II I i vol
v.jTH~~.BJI
c::J LJ CJ
liE .. ~
IGt I
-d
IIACYI ITSWI I
Ed o'lv"lvT~1I
I
I_~
jowolspolB/KI+ell
FlOODS
• Vc -
E2,
Vs -
E2
CD
No specified voltage at ECU terminals Vc or Vs and E2
I
(lG S/W ON)
Ol~-p----~---~-~
o
CV
Check that there is voltage between ECU terminals
+8
and
E
2 •
(lG S/W ON)
FI0612
OK
NO
@
Check air flow meter.
Refer to
+8 -
E2
trouble section.
NO
OK
Replace or repair air Check wiring between ECU and
flow meter. air flow meter.
FI0613
OK NO
I
Air Flow Meter
@
I
Try another ECU.
I
I
Replace or repair wiring.