Lexus ES300 (1997 year). Manual — part 334
S05723
J22
Junction
Connector
A
A
A
A
A
IK3
B–R
B–R
B–R
W–R
12
8
3
1K
1C
Switch
Ignition
7
6
5
5
4
1
1
1
1K
1B
2L
2A
W–R
AM2
B
F8
F6
Fusible
Link
Block
B–G
FL
MAIN
Battery
B–R
G
B–R
B–R
Y
L
Ignition Coil
Spark Plug
No.1
No.2
No.3
1
1
1
2
2
2
EE
BR
3
2
1
10
9
7
6
5
4
24
16
15
12
E10
E10
E10
E10
W–R
LG–B
BR–Y
GR
Igniter
ECM
IGT1
IGT2
IGT3
IGF
5V
Instrument
Panel J/B
Engine Room
J/B
Instrument
Panel J/B
–
DIAGNOSTICS
ENGINE
DI–113
265
1997 LEXUS ES300 (RM511U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check spark plug and spark of misfiring cylinder (See page
NG
Go to step 4.
OK
2
Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page
NG
Repair or replace harness or connector.
OK
A00237
ON
IGF(+)
BE6653
P24326
A00238
START
IGT2 IGT3 IGT1
(+) (+) (+)
BE6653
P23881
DI–114
–
DIAGNOSTICS
ENGINE
266
1997 LEXUS ES300 (RM511U)
3
Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a)
Disconnect the igniter connector.
(b)
Remove the glove compartment (See page
).
(c)
Turn ignition switch ON.
CHECK:
Measure voltage between terminal IGF of ECM connector and
body ground.
OK:
Voltage: 4.5
∼
5.5 V
OK
Replace igniter.
NG
Check and replace ECM (See page
).
4
Check for open and short in harness and connector in IGT 1
∼
3 signal circuits
between ECM and igniter (See page
).
NG
Repair or replace harness or connector.
OK
5
Check voltage between terminals IGT 1
∼
3 of ECM connector and body ground.
PREPARATION:
Remove the glove compartment (See page
).
CHECK:
Measure voltage between terminals IGT 1
∼
3 of ECM connec-
tor and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
P20870
IGT1
∼
IGT3 and IGF Signal Waveform
VOLT
5
0
5
0
5
0
5
0
IGT1
IGT2
IGT3
IGF
20 m sec./Division (Idling)
A00239
START
IGT2
(+)
IGT3
(+)
IGT1
(+)
BE6653
P23881
BE6653
P24329
A00124
ON
START
9 (+)
–
DIAGNOSTICS
ENGINE
DI–115
267
1997 LEXUS ES300 (RM511U)
Reference INSPECTION USING OSCILLOSCOPE
During idling, check waveform between terminals IGT 1
∼
3,
IGF and E1 of ECM.
HINT:The correct waveforms are as shown.
NG
Check and replace ECM (See page
).
OK
6
Disconnect igniter connector and check voltage between terminals IGT 1
∼
3 of
ECM connector and body ground.
PREPARATION:
(a)
Disconnect the igniter connector.
(b)
Remove the glove compartment (See page
).
CHECK:
Measure voltage between terminals IGT 1
∼
3 of ECM connec-
tor and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
NG
Check and replace ECM (See page
).
OK
7
Check voltage between terminal 9 of igniter connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
Measure voltage between terminal 9 of igniter connector and
body ground, when ignition switch is turned to ”ON” and
”START” position.
OK:
Voltage: 9
∼
14 V
NG
Check and repair igniter power source circuit.
OK
DI–116
–
DIAGNOSTICS
ENGINE
268
1997 LEXUS ES300 (RM511U)
8
Check for open and short in harness and connector between ignition switch and
ignition coil, ignition coil and igniter (See page
NG
Repair or replace harness or connector.
OK
9
).
NG
Replace ignition coil.
OK
Replace igniter.
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