Dtc P0351 Ignition Coil A Primary / Secondary Circuit

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM SIMULATION TEST

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM (IGT SIGNAL TERMINAL))

CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGF1, IGF2 SIGNAL)

CHECK IF DTC OUTPUT RECURS

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


DESCRIPTION

HINT:
  1. These DTCs indicate malfunctions relating to the primary circuit.
  2. IF DTC P0351 is set, check No. 1 ignition coil circuit.
  3. IF DTC P0352 is set, check No. 2 ignition coil circuit.
  4. IF DTC P0353 is set, check No. 3 ignition coil circuit.
  5. IF DTC P0354 is set, check No. 4 ignition coil circuit.
  6. IF DTC P0355 is set, check No. 5 ignition coil circuit.
  7. IF DTC P0356 is set, check No. 6 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 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 signals (IGT) 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 signal (IGF) to the ECM, for each cylinder ignition.

Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


DTC No.
DTC Detection Condition
Trouble Area
P0351
P0352
P0353
P0354
P0355
P0356
No IGF signal to ECM while engine running
(1 trip detection logic)
  1. Ignition system
  2. Open or short in IGF1, IGF2 or IGT circuit (1 to 6) between ignition coil and ECM
  3. No. 1 to No. 6 ignition coils
  4. ECM

  1. Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit
  2. Reference: Inspection using an oscilloscope.
  3. While cranking or idling the engine, check the waveform between terminals IGT (1 to 6) and E1, and IGF1, IGF2 and E1 of the ECM connector.
    Item
    		Content
    Terminals
    		CH1: IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 - E1
    CH2: IGF1, IGF2 - E1
    Equipment Settings
    		2 V/DIV.
    20 msec./DIV.
    Conditions
    		Cranking or idling

MONITOR DESCRIPTION


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

If the ECM does not receive any IGF signals despite transmitting the IGT signal, it interprets this as a fault in the igniter and sets a DTC.
If the malfunction is not repaired successfully, a DTC is set 1 second after the engine is next started.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


INSPECTION PROCEDURE

HINT:
  1. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunction 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.
1.PERFORM SIMULATION TEST

  1. Clear the DTC(s) (Click here).

  1. Change the arrangement of the ignition coils (with igniters).

    NOTICE:
    Do not change the location of the connectors.

  1. Reform a simulation test.

    Result:
    Display (DTC Output)
    		Proceed to
    Same DTCs (that have been erased)
    		A
    Other DTCs
    		B


B
REPLACE IGNITION COIL ASSEMBLY
A


2.INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the E53, E54, E55, E60, E61 or E27 ignition coil connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage between the terminal of the wire harness side connector and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E53-1 - Body ground
    		9 to 14 V
    E54-1 - Body ground
    		9 to 14 V
    E55-1 - Body ground
    		9 to 14 V
    E60-1 - Body ground
    		9 to 14 V
    E61-1 - Body ground
    		9 to 14 V
    E27-1 - Body ground
    		9 to 14 V

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E53-4 - Body ground
    		Below 1 Ω
    E54-4 - Body ground
    		Below 1 Ω
    E55-4 - Body ground
    		Below 1 Ω
    E60-4 - Body ground
    		Below 1 Ω
    E61-4 - Body ground
    		Below 1 Ω
    E27-4 - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM (IGT SIGNAL TERMINAL))
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the E53, E54, E55, E60, E61 or E27 ignition coil connector.

  1. Disconnect the ECM E6 and E8 connectors.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    IGT1 (E53-3) - IGT1 (E6-13)
    		Below 1 Ω
    IGT2 (E54-3) - IGT2 (E8-17)
    		Below 1 Ω
    IGT3 (E55-3) - IGT3 (E6-10)
    		Below 1 Ω
    IGT4 (E60-3) - IGT4 (E6-12)
    		Below 1 Ω
    IGT5 (E61-3) - IGT5 (E8-27)
    		Below 1 Ω
    IGT6 (E27-3) - IGT6 (E8-26)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    IGT1 (E53-3) or IGT1 (E6-13) - Body ground
    		10 kΩ or higher
    IGT2 (E54-3) or IGT2 (E8-17) - Body ground
    		10 kΩ or higher
    IGT3 (E55-3) or IGT3 (E6-10) - Body ground
    		10 kΩ or higher
    IGT4 (E60-3) or IGT4 (E6-12) - Body ground
    		10 kΩ or higher
    IGT5 (E61-3) or IGT5 (E8-27) - Body ground
    		10 kΩ or higher
    IGT6 (E27-3) or IGT6 (E8-26) - Body ground
    		10 kΩ or higher
    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    IGF1 (E53-2) - IGF1 (E6-7)
    		Below 1 Ω
    IGF2 (E54-2) - IGF2 (E6-6)
    		Below 1 Ω
    IGF3 (E55-2) - IGF1 (E6-7)
    		Below 1 Ω
    IGF4 (E60-2) - IGF2 (E6-6)
    		Below 1 Ω
    IGF5 (E61-2) - IGF1 (E6-7)
    		Below 1 Ω
    IGF6 (E27-2) - IGF2 (E6-6)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    IGF1 (E53-2) or IGF1 (E6-7) - Body ground
    		10 kΩ or higher
    IGF2 (E54-2) or IGF2 (E6-6) - Body ground
    		10 kΩ or higher
    IGF3 (E55-2) or IGF1 (E6-7)- Body ground
    		10 kΩ or higher
    IGF4 (E60-2) or IGF2 (E6-6) - Body ground
    		10 kΩ or higher
    IGF5 (E61-2) or IGF1 (E6-7) - Body ground
    		10 kΩ or higher
    IGF6 (E27-2) or IGF2 (E6-6)- Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGF1, IGF2 SIGNAL)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Inspect using an oscilloscope.

  1. While cranking or idling, check the waveform of the ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    IGF1 (E6-7) - E1 (E7-7)
    IGF2 (E6-6) - E1 (E7-7)
    IGT1 (E6-13) - E1 (E7-7)
    IGT2 (E8-17) - E1 (E7-7)
    IGT3 (E6-10) - E1 (E7-7)
    IGT4 (E6-12) - E1 (E7-7)
    IGT5 (E8-27) - E1 (E7-7)
    IGT6 (E8-26) - E1 (E7-7)
    		Correct waveform is shown


NG
REPLACE ECM
OK


5.CHECK IF DTC OUTPUT RECURS

  1. Clear the DTC (Click here).

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the intelligent tester ON.

  1. Enter the following menus: Power train / Engine / DTC.

  1. Read DTC.

    Display (DTC Output)
    		Proceed to
    P0351, P0352, P0353, P0354, P0355 and/or P0356 are output
    		A
    No output
    		B


B
REPAIR OR REPLACE SYSTEM OK
A

REPLACE ECM