Toyota Land Cruiser 1988 Repair Manual page 175

Fl-44 EFI SYSTEM- Troubleshooting with Volt/Ohmmeter
CHECK CONNECTOR
ECU
VF1
VF1
VF2
TE1
VF2
T
Oxygen Sensor 1
E1
I
fV""1
t - - - - - - - -
. J ,
'
' - - -
----
OX1
~
-
....
-
~
Oxygen Sensor Heater 1r
HT1
Oxygen Sensor 2
- - I
1""""1 ::.---- __
J'"
...
"""""------
OX2
~
--
Oxygen Sensor Heater 2
HT2
+B
E1
-==-
Fl2702
CD
CD
There is no voltage between ECU terminals VF1 or VF2 and E1.
F12411
F12813
Check that there is specified voltage between ECU terminal VF1 or
VF2 and body ground.
NO OK
Check wiring between ECU terminal E1 and body ground.
Check for suction of air into exhaust
system.
OK
Check for air leak from air intake system.
OK
Check distributor and ignition system.
OK
OK
@Check operation of oxygen sensors.
BAD
Check wiring between oxygen sensors
and ECU connectors.
OK
Replace oxygen sensors.
Repair air suction.
BAD
Repair air leak.
BAD
Repair or replace.
BAD
Repair or replace.
BAD
Repair or replace.
BAD
Repair or replace.
BAD
Repair or replace.
Repair or replace.
OK
System normal.
Repair wiring.
*
Rich malfunction only