2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0351-P0358; Ignition Coil "A" Primary / Secondary Circuit; 2007 MY LX470 [08/2006

Last Modified: 7-3-2017	6.8:8.0.40	Doc ID: RM000000TCY00LX
Model Year Start: 2007	Model: LX470	Prod Date Range: [08/2006 - ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0351-P0358; Ignition Coil "A" Primary / Secondary Circuit; 2007 MY LX470 [08/2006 - ]

DTC

P0351

Ignition Coil "A" Primary / Secondary Circuit

DTC

P0352

Ignition Coil "B" Primary / Secondary Circuit

DTC

P0353

Ignition Coil "C" Primary / Secondary Circuit

DTC

P0354

Ignition Coil "D" Primary / Secondary Circuit

DTC

P0355

Ignition Coil "E" Primary / Secondary Circuit

DTC

P0356

Ignition Coil "F" Primary / Secondary Circuit

DTC

P0357

Ignition Coil "G" Primary / Secondary Circuit

DTC

P0358

Ignition Coil "H" Primary / Secondary Circuit

DESCRIPTION

HINT:

These DTCs indicate a malfunction related to a primary circuit.
If DTC P0351 is displayed, check No. 1 ignition coil circuit.
If DTC P0352 is displayed, check No. 2 ignition coil circuit.
If DTC P0353 is displayed, check No. 3 ignition coil circuit.
If DTC P0354 is displayed, check No. 4 ignition coil circuit.
If DTC P0355 is displayed, check No. 5 ignition coil circuit.
If DTC P0356 is displayed, check No. 6 ignition coil circuit.
If DTC P0357 is displayed, check No. 7 ignition coil circuit.
If DTC P0358 is displayed, check No. 8 ignition coil circuit.

A Direct Ignition System (DIS) is used on this vehicle.

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 passes from the center electrode to the ground electrode.

The ECM determines the ignition timing and outputs the ignition signals (IGTs) for each cylinder. Using the IGTs, the ECM turns the power transistor inside the igniter on/off, which switches on/off current to the primary coil. When current to the primary coil is cut off, high voltage is generated in the secondary coil and this voltage is applied to the spark plugs to create sparks inside the cylinders. As the ECM cuts current to the primary coil, the igniter sends back ignition confirmation signals (IGFs) for each cylinder ignition to the ECM.

DTC No.

DTC Detection Condition

Trouble Area

P0351

P0352

P0353

P0354

P0355

P0356

P0357

P0358

No IGF signal to ECM while engine is running

(1 trip detection logic)

Ignition system
Open or short in IGF or IGT circuit (1 to 8) between ignition coil and ECM
No. 1 to No. 8 ignition coil (primary ignition)
ECM

Reference: Inspect using an oscilloscope.

While cranking or idling the engine, check the waveform between terminals IGT1 to IGT8 and E1, and IGF1 to IGF2 and E1 of the E6, E8 and E6 ECM connectors.

Items

Contents

Terminals

CH1: IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7, IGT8 - E1

CH2: IGF1, IGF2 - E1

Equipment Settings

2 V/DIV.

20 msec./DIV.

Condition

Cranking or idling

MONITOR DESCRIPTION

If the ECM does not receive an IGF after sending an IGT, it interprets this as a fault in the igniter and sets a DTC. The monitor runs for 1 second (the first second of engine idle) after the engine is started.

MONITOR STRATEGY

Related DTCs	P0351: Igniter (cylinder 1) malfunction P0352: Igniter (cylinder 2) malfunction P0353: Igniter (cylinder 3) malfunction P0354: Igniter (cylinder 4) malfunction P0355: Igniter (cylinder 5) malfunction P0356: Igniter (cylinder 6) malfunction P0357: Igniter (cylinder 7) malfunction P0358: Igniter (cylinder 8) malfunction
Required Sensors/Components (Main)	Igniter
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous
Duration	0.256 seconds
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present	-
Engine speed	1,500 rpm or less
Either A or B condition is met	-
A. Following conditions are met	(a) and (b)
(a) Engine speed	500 rpm or less
(b) Battery voltage	6 V or higher
B. Following conditions are met	(a), (b) and (c)
(a) Engine speed	Higher than 500 rpm
(b) Battery voltage	10 V or higher
(c) Number of sparks after CPU is reset	5 sparks or more

TYPICAL MALFUNCTION THRESHOLDS

Ignition signal fail count	More than 2 times
Ignition signal fail count	When IGF does not return despite sending IGT

COMPONENT OPERATING RANGE

IGF signal

Igniter outputs IGF signal when it receives IGT signal from ECM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.	CHECK SPARK PLUG AND SPARK OF MISFIRING CYLINDER

GO TO STEP 4

2.	CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM [IGF SIGNAL TERMINAL])

(a) Check harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT ECM (IGF1 AND IGF2 VOLTAGE)

(a) Disconnect the ignition coil connector.

(b) Turn the ignition switch ON.

Standard voltage:

Tester Connection	Specified Condition
E8-24 (IGF1) - E6-1 (E1)	4.5 to 5.5 V
E8-25 (IGF2) - E6-1 (E1)	4.5 to 5.5 V

(d) Reconnect the ignition coil connector.

REPLACE ECM

REPLACE IGNITION COIL

4.	CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM [IGT SIGNAL TERMINAL])

(a) Check harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7 OR IGT8 VOLTAGE)

(a) Measure the voltage of the E6 and E8 ECM connectors when the engine is cranked.

Standard voltage:

Tester Connection	Specified Condition
E8-8 (IGT1) - E6-1 (E1)	0.1 to 4.5 V
E8-15 (IGT2) - E6-1 (E1)	0.1 to 4.5 V
E8-11 (IGT3) - E6-1 (E1)	0.1 to 4.5 V
E8-10 (IGT4) - E6-1 (E1)	0.1 to 4.5 V
E8-13 (IGT5) - E6-1 (E1)	0.1 to 4.5 V
E8-12 (IGT6) - E6-1 (E1)	0.1 to 4.5 V
E8-14 (IGT7) - E6-1 (E1)	0.1 to 4.5 V
E8-9 (IGT8) - E6-1 (E1)	0.1 to 4.5 V

REPLACE ECM

6.	INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7 OR IGT8 VOLTAGE)

(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil connector.

(b) Measure the voltage of the E6 and E8 ECM connectors when the engine is cranked.

Standard voltage:

Tester Connection	Specified Condition
E8-8 (IGT1) - E6-1 (E1)	4.5 V or more
E8-15 (IGT2) - E6-1 (E1)	4.5 V or more
E8-11 (IGT3) - E6-1 (E1)	4.5 V or more
E8-10 (IGT4) - E6-1 (E1)	4.5 V or more
E8-13 (IGT5) - E6-1 (E1)	4.5 V or more
E8-12 (IGT6) - E6-1 (E1)	4.5 V or more
E8-14 (IGT7) - E6-1 (E1)	4.5 V or more
E8-9 (IGT8) - E6-1 (E1)	4.5 V or more

REPLACE ECM

7.	INSPECT IGNITION COIL (POWER SOURCE)

(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 and I8 ignition coil connector.

(b) Turn the ignition switch ON or START.

Standard voltage:

Tester Connection	Specified Condition
I1-1 (+B) - Body ground	9 to 14 V
I2-1 (+B) - Body ground	9 to 14 V
I3-1 (+B) - Body ground	9 to 14 V
I4-1 (+B) - Body ground	9 to 14 V
I5-1 (+B) - Body ground	9 to 14 V
I6-1 (+B) - Body ground	9 to 14 V
I7-1 (+B) - Body ground	9 to 14 V
I8-1 (+B) - Body ground	9 to 14 V

(d) Reconnect the ignition coil connector.

REPLACE IGNITION COIL

8.	CHECK HARNESS AND CONNECTOR (IGNITION COIL - IGNITION SWITCH)

(a) Check harness and connector .

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE IGNITION COIL