Dtc P0351 Ignition Coil A Primary / Secondary Circuit


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

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

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 output, check the No. 1 ignition coil assembly circuit.
  3. If DTC P0352 is output, check the No. 2 ignition coil assembly circuit.
  4. If DTC P0353 is output, check the No. 3 ignition coil assembly circuit.
  5. If DTC P0354 is output, check the No. 4 ignition coil assembly circuit.
  6. If DTC P0355 is output, check the No. 5 ignition coil assembly circuit.
  7. If DTC P0356 is output, check the No. 6 ignition coil assembly 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 assembly, 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 electrodes 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.

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.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 is sent to the ECM while the engine is running (1 trip detection logic).
  1. Ignition system
  2. Open or short in IGF1 or IGT circuit (1 to 6) between ignition coil assembly and ECM
  3. No. 1 to No. 6 ignition coil assembly
  4. ECM

  1. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.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 and E1 of the ECM connector.
    Item
    		Content
    Terminal
    		CH1: IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 - E1
    CH2: IGF1 - E1
    Equipment Setting
    		2 V/DIV.
    20 msec./DIV.
    Condition
    		Cranking or idling

MONITOR DESCRIPTION


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.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 stores a DTC.
If the malfunction is not repaired successfully, a DTC is stored 1 second after the engine is next started.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. for Automatic Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. for Manual Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the GTS. 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.
1.INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the ignition coil assembly connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C7-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C8-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C9-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C10-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C11-4 (GND) - Body ground
    		Always
    		Below 1 Ω
    C12-4 (GND) - Body ground
    		Always
    		Below 1 Ω

  1. Turn the engine switch on (IG).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C7-1 (+B) - C7-4 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    C8-1 (+B) - C8-4 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    C9-1 (+B) - C9-4 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    C10-1 (+B) - C10-4 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    C11-1 (+B) - C11-4 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    C12-1 (+B) - C12-4 (GND)
    		Engine switch on (IG)
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Ignition Coil Assembly)

  1. Reconnect the ignition coil assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSEMBLY - ECM)

  1. Disconnect the ignition coil assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C7-2 (IGF) - C35-23 (IGF1)
    		Always
    		Below 1 Ω
    C8-2 (IGF) - C35-23 (IGF1)
    		Always
    		Below 1 Ω
    C9-2 (IGF) - C35-23 (IGF1)
    		Always
    		Below 1 Ω
    C10-2 (IGF) - C35-23 (IGF1)
    		Always
    		Below 1 Ω
    C11-2 (IGF) - C35-23 (IGF1)
    		Always
    		Below 1 Ω
    C12-2 (IGF) - C35-23 (IGF1)
    		Always
    		Below 1 Ω
    C7-3 (IGT1) - C36-27 (IGT1)
    		Always
    		Below 1 Ω
    C8-3 (IGT2) - C36-28 (IGT2)
    		Always
    		Below 1 Ω
    C9-3 (IGT3) - C35-25 (IGT3)
    		Always
    		Below 1 Ω
    C10-3 (IGT4) - C35-26 (IGT4)
    		Always
    		Below 1 Ω
    C11-3 (IGT5) - C35-27 (IGT5)
    		Always
    		Below 1 Ω
    C12-3 (IGT6) - C35-28 (IGT6)
    		Always
    		Below 1 Ω
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C7-2 (IGF) - C36-6 (IGF1)
    		Always
    		Below 1 Ω
    C8-2 (IGF) - C36-6 (IGF1)
    		Always
    		Below 1 Ω
    C9-2 (IGF) - C36-6 (IGF1)
    		Always
    		Below 1 Ω
    C10-2 (IGF) - C36-6 (IGF1)
    		Always
    		Below 1 Ω
    C11-2 (IGF) - C36-6 (IGF1)
    		Always
    		Below 1 Ω
    C12-2 (IGF) - C36-6 (IGF1)
    		Always
    		Below 1 Ω
    C7-3 (IGT1) - C36-24 (IGT1)
    		Always
    		Below 1 Ω
    C8-3 (IGT2) - C36-25 (IGT2)
    		Always
    		Below 1 Ω
    C9-3 (IGT3) - C36-26 (IGT3)
    		Always
    		Below 1 Ω
    C10-3 (IGT4) - C36-27 (IGT4)
    		Always
    		Below 1 Ω
    C11-3 (IGT5) - C36-28 (IGT5)
    		Always
    		Below 1 Ω
    C12-3 (IGT6) - C35-25 (IGT6)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C7-2 (IGF) or C35-23 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C8-2 (IGF) or C35-23 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C9-2 (IGF) or C35-23 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C10-2 (IGF) or C35-23 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C11-2 (IGF) or C35-23 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C12-2 (IGF) or C35-23 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C7-3 (IGT1) or C36-27 (IGT1) - Body ground
    		Always
    		10 kΩ or higher
    C8-3 (IGT2) or C36-28 (IGT2) - Body ground
    		Always
    		10 kΩ or higher
    C9-3 (IGT3) or C35-25 (IGT3) - Body ground
    		Always
    		10 kΩ or higher
    C10-3 (IGT4) or C35-26 (IGT4) - Body ground
    		Always
    		10 kΩ or higher
    C11-3 (IGT5) or C35-27 (IGT5) - Body ground
    		Always
    		10 kΩ or higher
    C12-3 (IGT6) or C35-28 (IGT6) - Body ground
    		Always
    		10 kΩ or higher
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    C7-2 (IGF) or C36-6 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C8-2 (IGF) or C36-6 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C9-2 (IGF) or C36-6 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C10-2 (IGF) or C36-6 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C11-2 (IGF) or C36-6 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C12-2 (IGF) or C36-6 (IGF1) - Body ground
    		Always
    		10 kΩ or higher
    C7-3 (IGT1) or C36-24 (IGT1) - Body ground
    		Always
    		10 kΩ or higher
    C8-3 (IGT2) or C36-25 (IGT2) - Body ground
    		Always
    		10 kΩ or higher
    C9-3 (IGT3) or C36-26 (IGT3) - Body ground
    		Always
    		10 kΩ or higher
    C10-3 (IGT4) or C36-27 (IGT4) - Body ground
    		Always
    		10 kΩ or higher
    C11-3 (IGT5) or C36-28 (IGT5) - Body ground
    		Always
    		10 kΩ or higher
    C12-3 (IGT6) or C35-25 (IGT6) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ignition coil assembly connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK WHETHER DTC OUTPUT RECURS (DTC P0351, P0352, P0353, P0354, P0355 OR P0356)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Clear the DTCs (LandCruiser RM000000PDK1DIX.html).

  1. Shuffle the arrangement of the ignition coil assembly (among No. 1 to No. 6 cylinders).

    NOTICE:
    Do not shuffle the connectors.

  1. Perform a simulation test.

  1. Check the DTCs output on the GTS.

    Result
    Result
    		Proceed to
    Same DTC output
    		A
    Different ignition coil assembly DTC output
    		B
    HINT:
    for Automatic Transmission
    Perform "Inspection After Repair" after replacing the ignition coil assembly (LandCruiser RM000004NJC03SX.html).


B
REPLACE IGNITION COIL ASSEMBLY (LandCruiser RM000002I2Y03MX.html)
A

REPLACE ECM (LandCruiser RM00000329203TX.html)