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 

10-2

)

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 

18-1

)

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