Toyota 3F-E - Page 99

No.
Terminals Trouble Condition
STD Voltage
8
ISC1
ISC4 — El
No voltage
Ignition switch ON
10 — 14 V
ECU
Fuse
EFI 15A
Fusible
Link
MAIN 0.85R
Battery
F12437
EFI Main Relay
ISC1
o
ISC2
o
ISC3
o
ISC4
+B
o +
B1
o
M REL
El
O
n
Voltmeter
1 =1
DEMOOD
200MODOC
+B + B1
0
EEO
000C
I
O00000
ODOODEO0D
F10312
////i/////
ECU
There is no voltage between ECU terminals ISC1 ISC4
• and El. (IG SW ON)
O
Check that there is voltage between ECU terminal + B
(
+
B1)
and body ground.
(IG SW ON)
OK
Check wiring between ECU terminal El and body
ground.
OK
BAD
• Check ISC valve.
• (See page FI-67)
BAD
OK
Replace ISC
valve.
Check wiring between ECU and EFI
main relay.
OK
BAD
Try another ECU.
Repair or replace.
Repair or replace.
FI-40 EFI SYSTEM - Troubleshooting with Volt/Ohmmeter
ProCarManuals.com