Toyota 3F-E - Page 102

ECU
0 0 0
q
ao 00000
00
0000000 000
oo
q q
^ q q aoo^ ^0000000000^
Voltmeter
^_^ VF2
o
E1 VF1
F12940
Check Connector
0^0 ] 0o0
LI^
^^^ TG1
JZ^
Service
Wire
it
Nly
VF2
il^ cktd
—
VF1
Check Connector
Voltmeter ,
1
tI
V
FI2411
F I281 3
FI-43
EFI SYSTEM — Troubleshooting with Volt/Ohmmeter
CHECK CONNECTOR
ECU
VF1
VF2
TE1
Oxygen Sensor 1
El
fV
Oxygen Sensor Heater 1
Oxygen Sensor 2
_---
Oxygen Sensor
^a
—
,
OX2
HT2
+B
El
FI2702
1 There is no voltage between ECU terminals VF1 or VF2 and El.
Check that there is specified voltage between ECU terminal VF1 or
VF2 and body ground.
NO
OK
Check wiring between ECU terminal El and body ground.
OK
BAD
Try another ECU.
Repair or replace.
Check for suction of air into exhaust
BAD
Repair air suction.
system.
.
OK
BAD
Check for air leak from air intake system.
Repair air leak.
OK
BAD
Check spark plugs.
Repair or replace.
OK
BAD
Check distributor and ignition system.
Repair or replace.
OK
BAD
Check fuel pressure.
Repair or replace.
OK
BAD
Check injectors.
Repair or replace.
OK
BAD
Check cold start injector.
*
Repair or replace.
OK
BAD
Check air flow meter.
Repair or replace.
OK
OK
O
Check operation of oxygen sensors.
System normal.
BAD
Check wiring between oxygen sensors
BAD
Repair wiring.
.
and ECU connectors.
OK
Replace oxygen sensors.
* Rich malfunction only
ProCarManuals.com