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Last Modified: 11-27-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: LX570 Doc ID: RM000000XH4061X
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570)

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 malfunctions relating to the primary circuit.
  • If DTC P0351 is output, check the No. 1 ignition coil circuit.
  • If DTC P0352 is output, check the No. 2 ignition coil circuit.
  • If DTC P0353 is output, check the No. 3 ignition coil circuit.
  • If DTC P0354 is output, check the No. 4 ignition coil circuit.
  • If DTC P0355 is output, check the No. 5 ignition coil circuit.
  • If DTC P0356 is output, check the No. 6 ignition coil circuit.
  • If DTC P0357 is output, check the No. 7 ignition coil circuit.
  • If DTC P0358 is output, check the No. 8 ignition coil circuit.

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

The DIS is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil and one spark plug is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is applied directly to each spark plug. The sparks of the spark plugs pass from the center electrode to the ground electrodes.

The ECM determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn, switches on and off the current to the primary coil. When the current to the primary coil is cut off, a powerful voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition confirmation (IGF) signal to the ECM for each cylinder ignition.



DTC Code

DTC Detection Condition

Trouble Area

P0351

P0352

P0353

P0354

P0355

P0356

P0357

P0358

No IGF signal is sent to the ECM while the engine is running (1 trip detection logic).
  • Ignition system
  • Open or short in IGF1 or IGT circuit (1 to 8) between ignition coil and ECM
  • No. 1 to No. 8 ignition coils
  • ECM

Reference: Inspection using an oscilloscope.



Standard:

Tester Connection

Tool Setting

Condition

Specified Condition

C53-40 (IGT1) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-33 (IGT2) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-37 (IGT3) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-34 (IGT4) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-35 (IGT5) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-36 (IGT6) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-38 (IGT7) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-39 (IGT8) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-104 (IGF1) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

C53-105 (IGF2) - C53-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

The correct waveform is as shown

HINT:

While cranking or idling the engine, check the waveform between terminals IGT (1 to 8) and E1, and IGF1 or IGF2 and E1 of the ECM connector.

MONITOR DESCRIPTION



If the ECM does not receive any IGF signals despite transmitting the IGT signal, it interprets this as a fault in the igniter and stores DTC(s).

If the malfunction is not repaired successfully, a DTC is stored 1 second after the engine is next 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

About 1 second

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not stored

None

Either of following conditions A or B met

-

A. Engine speed

1,500 rpm or less

B. Starter

OFF

Either of following conditions C or D met

-

C. Both of following conditions (a) and (b) met

-

(a) Engine speed

500 rpm or less

(b) Battery voltage

6 V or higher

D. All of following conditions (a), (b) and (c) met

-

(a) Engine speed

More than 500 rpm

(b) Battery voltage

10 V or higher

(c) Number of sparks after CPU reset

5 sparks or more

TYPICAL MALFUNCTION THRESHOLDS

IGF signal

ECM does not receive any IGF signal despite ECM sending IGT signal to igniter

COMPONENT OPERATING RANGE

IGF signal

Igniter transmits IGF signal when it receives IGT signal from ECM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)


(a) Disconnect the C5, C6, C7, C8, C10, C11, C12 or C13 ignition coil connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C5-4 (GND) - Body ground

Always

Below 1 Ω

C13-4 (GND) - Body ground

Always

Below 1 Ω

C6-4 (GND) - Body ground

Always

Below 1 Ω

C12-4 (GND) - Body ground

Always

Below 1 Ω

C7-4 (GND) - Body ground

Always

Below 1 Ω

C11-4 (GND) - Body ground

Always

Below 1 Ω

C8-4 (GND) - Body ground

Always

Below 1 Ω

C10-4 (GND) - Body ground

Always

Below 1 Ω

(c) Turn the engine switch on (IG).

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

C5-1 (+B) - C5-4 (GND)

Engine switch on (IG)

11 to 14 V

C13-1 (+B) - C13-4 (GND)

Engine switch on (IG)

11 to 14 V

C6-1 (+B) - C6-4 (GND)

Engine switch on (IG)

11 to 14 V

C12-1 (+B) - C12-4 (GND)

Engine switch on (IG)

11 to 14 V

C7-1 (+B) - C7-4 (GND)

Engine switch on (IG)

11 to 14 V

C11-1 (+B) - C11-4 (GND)

Engine switch on (IG)

11 to 14 V

C8-1 (+B) - C8-4 (GND)

Engine switch on (IG)

11 to 14 V

C10-1 (+B) - C10-4 (GND)

Engine switch on (IG)

11 to 14 V
OK

2.

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)


(a) Disconnect the C5, C6, C7, C8, C10, C11, C12 or C13 ignition coil connector.

(b) Disconnect the C53 ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C5-2 (IGF1) - C53-104 (IGF1)

Always

Below 1 Ω

C13-2 (IGF2) - C53-105 (IGF2)

Always

Below 1 Ω

C6-2 (IGF2) - C53-105 (IGF2)

Always

Below 1 Ω

C12-2 (IGF1) - C53-104 (IGF1)

Always

Below 1 Ω

C7-2 (IGF2) - C53-105 (IGF2)

Always

Below 1 Ω

C11-2 (IGF1) - C53-104 (IGF1)

Always

Below 1 Ω

C8-2 (IGF1) - C53-104 (IGF1)

Always

Below 1 Ω

C10-2 (IGF2) - C53-105 (IGF2)

Always

Below 1 Ω

C5-3 (IGT1) - C53-40 (IGT1)

Always

Below 1 Ω

C13-3 (IGT2) - C53-33 (IGT2)

Always

Below 1 Ω

C6-3 (IGT3) - C53-37 (IGT3)

Always

Below 1 Ω

C12-3 (IGT4) - C53-34 (IGT4)

Always

Below 1 Ω

C7-3 (IGT5) - C53-35 (IGT5)

Always

Below 1 Ω

C11-3 (IGT6) - C53-36 (IGT6)

Always

Below 1 Ω

C8-3 (IGT7) - C53-38 (IGT7)

Always

Below 1 Ω

C10-3 (IGT8) - C53-39 (IGT8)

Always

Below 1 Ω

C5-2 (IGF1) or C53-104 (IGF1) - Body ground

Always

10 kΩ or higher

C13-2 (IGF2) or C53-105 (IGF2) - Body ground

Always

10 kΩ or higher

C6-2 (IGF2) or C53-105 (IGF2) - Body ground

Always

10 kΩ or higher

C12-2 (IGF1) or C53-104 (IGF1) - Body ground

Always

10 kΩ or higher

C7-2 (IGF2) or C53-105 (IGF2) - Body ground

Always

10 kΩ or higher

C11-2 (IGF1) or C53-104 (IGF1) - Body ground

Always

10 kΩ or higher

C8-2 (IGF1) or C53-104 (IGF1) - Body ground

Always

10 kΩ or higher

C10-2 (IGF2) or C53-105 (IGF2) - Body ground

Always

10 kΩ or higher

C5-3 (IGT1) or C53-40 (IGT1) - Body ground

Always

10 kΩ or higher

C13-3 (IGT2) or C53-33 (IGT2) - Body ground

Always

10 kΩ or higher

C6-3 (IGT3) or C53-37 (IGT3) - Body ground

Always

10 kΩ or higher

C12-3 (IGT4) or C53-34 (IGT4) - Body ground

Always

10 kΩ or higher

C7-3 (IGT5) or C53-35 (IGT5) - Body ground

Always

10 kΩ or higher

C11-3 (IGT6) or C53-36 (IGT6) - Body ground

Always

10 kΩ or higher

C8-3 (IGT7) or C53-38 (IGT7) - Body ground

Always

10 kΩ or higher

C10-3 (IGT8) or C53-39 (IGT8) - Body ground

Always

10 kΩ or higher
OK

3.

CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353, P0354, P0355, P0356, P0357 OR P0358)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG) and turn the Techstream on.

(c) Clear DTCs 3UR-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

(d) Shuffle the arrangement of the ignition coils (among No. 1 to No. 8 cylinders).

NOTICE:

Do not shuffle the connectors.

(e) Perform a simulation test.

(f) Check DTCs displayed on the Techstream.

Result

Result

Proceed to

Same DTC is output

A

Different ignition coil DTC is output

B
A