Lexus ES300 (2002 year). Manual — part 384
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
295
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK E.F.I ECU RELAY (See page
NG
REPLACE E.F.I ECU RELAY
OK
REPAIR OR REPLACE HARNESS AND CONNECTOR
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
P1300
IGNITER CIRCUIT MALFUNCTION(NO.1)
DTC
P1305
IGNITER CIRCUIT MALFUNCTION(NO.2)
DTC
P1310
IGNITER CIRCUIT MALFUNCTION(NO.3)
DTC
P1315
IGNITER CIRCUIT MALFUNCTION(No.4)
DTC
P1320
IGNITER CIRCUIT MALFUNCTION(NO.5)
DTC
P1325
IGNITER CIRCUIT MALFUNCTION(NO.6)
CIRCUIT DESCRIPTION
A Direct Ignition System (DIS) has been adopted. The DIS improves the ignition timing accuracy, reduces
high-voltage loss, and enhances the the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 1-cylinder ignition system which ignites one cylinder with one ignition coil. In the 1-cylinder
ignition system, the one spark plug is connected to the end of the secondary winding. High voltage generated
in the secondary winding is applied directly to the spark plug. The spark of the spark plug pass from the center
electrode to the ground electrode.
The ECM determines ignition timing and outputs the ignition signals (IGT) for each cylinder. Based on IGT
signals, the power transistors in the igniter cuts off the current to the primary coil in the ignition coil is supplied
to the spark plug that are connected to the end of the secondary coil. At the same time, the igniter also sends
an ignition confirmation signal (IGF) as a fail-safe measure to the ECM.
DTC No.
DTC Detecting Condition
Trouble Area
P1300
P1305
P1310
P1315
P1320
P1325
No IGF signal to engine ECU while engine is running
Ignition system
Open or short in IGF and IGT1 - 6 circuit from
ignition coil with ignite
No.1 - No.6 ignition coil with igniter
ECM
056HB-01
A61584
ECM
IGT1
IGT2
IGT3
IGT4
IGT5
IGT6
R-W
W-R
P
W-R
W - R
LG-B
IGF
W-R
W-R
Ignition Coil
and Igniter No. 1
B-R
IGN
1C
Noise
Filter
23
11
12
13
10
2
3
G-R
8
9
L
L-Y
W-R
W-R
E10
E10
E10
E10
E10
E10
E10
2
3
2
3
2
3
2
3
2
3
4
1
4
1
4
1
4
1
4
1
4
1
Ignition Coil
and Igniter No. 2
Ignition Coil
and Igniter No. 3
Ignition Coil
and Igniter No. 4
Ignition Coil
and Igniter No. 5
Ignition Coil
and Igniter No. 6
B-R
W-B
EF
AM2
B-R
B-R
W-B
B-R
W-B
W-B
B-R
B-R
W-B
B-R
B-R
Engine Room J/B
8
8
1L
B-R
B-R
8
IF6
Ignition
Switch
6
7
IF3
W-R
1E
1A
1
1
Battery
FL MAIN
Engine
Room R/B
Engine
Room J/B
2
2
W-B
3
B-G
W-R
B-G
1
W-B
W-B
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
297
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
WIRING DIAGRAM
A54406
E10
IGF
E2
+B
IGF IGT GND
A50294
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
HINT:
If DTC P1300 is displayed, check No.1 ignition coil with igniter circuit.
If DTC P1305 is displayed, check No.2 ignition coil with igniter circuit.
If DTC P1310 is displayed, check No.3 ignition coil with igniter circuit.
If DTC P1315 is displayed, check No.4 ignition coil with igniter circuit.
If DTC P1320 is displayed, check No.5 ignition coil with igniter circuit.
If DTC P1325 is displayed, check No.6 ignition coil with igniter circuit.
Read freeze frame data using hand-held tester. Because freeze frame records the engine conditions
when the malfunction is detected, when troubleshooting it is useful for determining whether the vehicle
was running or stopped, the engine warmed up or not, the air-fuel ratio lean or rich, etc. at the time
of the malfunction.
1
CHECK SPARK PLUG (See page
NG
Go to step 4
OK
2
CHECK HARNESS AND CONNECTOR(ECM - IGNITION COIL)
HINT:
The procedure below is for No.1 cylinder. If a malfunction is
found on the other cylinders, check the circuit for the cylinder
with referring to this procedure.
(a)
Disconnect the ignition coil connector.
(b)
Disconnect the ECM E10 connector.
(c)
Check for open between the terminals IGF of the ECM
connector and IGF of the ignition coil connector.
Resistance: 1
Ω
or less
(d)
Check for short between the terminals IGF and E2 of the
ECM connector.
Resistance: 1 M
Ω
or less
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
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