Dtc P0351 Ignition Coil A Primary / Secondary Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK SPARK PLUG AND SPARK OF MISFIRING CYLINDER

CHECK WIRE HARNESS (IGNITION COIL - ECM [IGF TERMINAL])

CHECK ECM (IGF1 VOLTAGE)

CHECK WIRE HARNESS (IGNITION COIL - ECM [IGT TERMINAL])

CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 VOLTAGE)

CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 VOLTAGE)

INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)

CHECK WIRE HARNESS (IGNITION COIL - IGNITION SWITCH)

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 displayed, check the No. 1 ignition coil circuit.
  3. IF DTC P0352 is displayed, check the No. 2 ignition coil circuit.
  4. IF DTC P0353 is displayed, check the No. 3 ignition coil circuit.
  5. IF DTC P0354 is displayed, check the No. 4 ignition coil circuit.
  6. IF DTC P0355 is displayed, check the No. 5 ignition coil circuit.
  7. IF DTC P0356 is displayed, check the No. 6 ignition coil circuit.
The Direct Ignition System (DIS) improves the ignition timing accuracy, reduces high-voltage loss, and enhances 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, 1 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. Based on the IGT signal, the power transistors in the igniter cut off the current to the primary coil in the ignition coil is supplied to the spark plug that is 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.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe 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 is running
(1 trip detection logic)
  1. Ignition system
  2. Open or short in IGF or IGT1 to 6 circuit from ignition coil to ECM
  3. No. 1 to No. 6 ignition coils
  4. ECM

  1. Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit
  2. Reference: Inspect using the oscilloscope.
  3. During cranking or idling, check the waveform between terminals IGT1 to IGT6 and E1, and IGF and E1 of the E15 and E17 ECM connectors.
    Item
    		Content
    Symbols (Terminal No.)
    		IGT1 (E15-8) - E1(E17-1)
    IGT2 (E15-9) - E1(E17-1)
    IGT3 (E15-10) - E1(E17-1)
    IGT4 (E15-11) - E1(E17-1)
    IGT5 (E15-12) - E1(E17-1)
    IGT6 (E15-13) - E1(E17-1)
    IGF1 (E15-24) - E1 (E17-1)
    Tool Setting
    		2 V/DIV., 20 msec./DIV.
    Condition
    		Idling

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is 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.CHECK SPARK PLUG AND SPARK OF MISFIRING CYLINDER


NG
Go to step 4
OK


2.CHECK WIRE HARNESS (IGNITION COIL - ECM [IGF TERMINAL])
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the I1, I2, I3, I4, I10 and I11 ignition coil connectors.

  1. Disconnect the E15 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    I1-2 (IGF) - E15-24 (IGF1)
    		Below 1 Ω
    I2-2 (IGF) - E15-24 (IGF1)
    		Below 1 Ω
    I3-2 (IGF) - E15-24 (IGF1)
    		Below 1 Ω
    I4-2 (IGF) - E15-24 (IGF1)
    		Below 1 Ω
    I10-2 (IGF) - E15-24 (IGF1)
    		Below 1 Ω
    I11-2 (IGF) - E15-24 (IGF1)
    		Below 1 Ω
    I1-2 (IGF) or E15-24 (IGF1) - Body ground
    		10 kΩ or higher
    I2-2 (IGF) or E15-24 (IGF1) - Body ground
    		10 kΩ or higher
    I3-2 (IGF) or E15-24 (IGF1) - Body ground
    		10 kΩ or higher
    I4-2 (IGF) or E15-24 (IGF1) - Body ground
    		10 kΩ or higher
    I10-2 (IGF) or E15-24 (IGF1) - Body ground
    		10 kΩ or higher
    I11-2 (IGF) or E15-24 (IGF1) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK ECM (IGF1 VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the ignition coil connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage of the E15 and E17 ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E15-24 (IGF1) - E17-1 (E1)
    		4.5 to 5.5 V


NG
REPLACE ECM
OK

REPLACE IGNITION COIL ASSEMBLY

4.CHECK WIRE HARNESS (IGNITION COIL - ECM [IGT TERMINAL])
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the I1, I2, I3, I4, I10 and I11 ignition coil connectors.

  1. Disconnect the E15 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    I1-3 (IGT1) - E15-8 (IGT1)
    		Below 1 Ω
    I2-3 (IGT2) - E15-9 (IGT2)
    		Below 1 Ω
    I3-3 (IGT3) - E15-10 (IGT3)
    		Below 1 Ω
    I4-3 (IGT4) - E15-11 (IGT4)
    		Below 1 Ω
    I10-3 (IGT5) - E15-12 (IGT5)
    		Below 1 Ω
    I11-3 (IGT6) - E15-13 (IGT6)
    		Below 1 Ω
    I1-3 (IGT1) or E15-8 (IGT1) - Body ground
    		10 kΩ or higher
    I2-3 (IGT2) or E15-9 (IGT2) - Body ground
    		10 kΩ or higher
    I3-3 (IGT3) or E15-10 (IGT3) - Body ground
    		10 kΩ or higher
    I4-3 (IGT4) or E15-11 (IGT4) - Body ground
    		10 kΩ or higher
    I10-3 (IGT5) or E15-12 (IGT5) - Body ground
    		10 kΩ or higher
    I11-3 (IGT6) or E15-13 (IGT6) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Measure the voltage of the E15 and E17 ECM connectors when the engine is cranked.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E15-8 (IGT1) - E17-1 (E1)
    		0.1 to 4.5 V
    E15-9 (IGT2) - E17-1 (E1)
    		0.1 to 4.5 V
    E15-10 (IGT3) - E17-1 (E1)
    		0.1 to 4.5 V
    E15-11 (IGT4) - E17-1 (E1)
    		0.1 to 4.5 V
    E15-12 (IGT5) - E17-1 (E1)
    		0.1 to 4.5 V
    E15-13 (IGT6) - E17-1 (E1)
    		0.1 to 4.5 V


NG
REPLACE ECM
OK


6.CHECK ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6 VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the I1, I2, I3, I4, I10 and I11 ignition coil connectors.

  1. Measure the voltage of the E15 and E17 ECM connectors when the engine is cranked.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E15-8 (IGT1) - E17-1 (E1)
    		4.5 V or more
    E15-9 (IGT2) - E17-1 (E1)
    		4.5 V or more
    E15-10 (IGT3) - E17-1 (E1)
    		4.5 V or more
    E15-11 (IGT4) - E17-1 (E1)
    		4.5 V or more
    E15-12 (IGT5) - E17-1 (E1)
    		4.5 V or more
    E15-13 (IGT6) - E17-1 (E1)
    		4.5 V or more


NG
REPLACE ECM
OK


7.INSPECT IGNITION COIL ASSEMBLY (POWER SOURCE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the I1, I2, I3, I4, I10 and I11 ignition coil connectors.

  1. Turn the ignition switch ON.

  1. Measure the voltage of the wire harness side connectors.

    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
    I10-1 (+B) - Body ground
    		9 to 14 V
    I11-1 (+B) - Body ground
    		9 to 14 V


OK
REPLACE IGNITION COIL ASSEMBLY
NG


8.CHECK WIRE HARNESS (IGNITION COIL - IGNITION SWITCH)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.1Gr-Fe Engine Control System.Sfi System. Dtc P0351 Ignition Coil A Primary / Secondary Circuit

  1. Disconnect the I1, I2, I3, I4, I10 and I11 ignition coil connectors.

  1. Disconnect the I6 ignition switch connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    I1-1 (+B) - I6-6 (IG2)
    		Below 1 Ω
    I2-1 (+B) - I6-6 (IG2)
    		Below 1 Ω
    I3-1 (+B) - I6-6 (IG2)
    		Below 1 Ω
    I4-1 (+B) - I6-6 (IG2)
    		Below 1 Ω
    I10-1 (+B) - I6-6 (IG2)
    		Below 1 Ω
    I11-1 (+B) - I6-6 (IG2)
    		Below 1 Ω
    I1-1 (+B) or I6-6 (IG2) - Body ground
    		10 kΩ or higher
    I2-1 (+B) or I6-6 (IG2) - Body ground
    		10 kΩ or higher
    I3-1 (+B) or I6-6 (IG2) - Body ground
    		10 kΩ or higher
    I4-1 (+B) or I6-6 (IG2) - Body ground
    		10 kΩ or higher
    I10-1 (+B) or I6-6 (IG2) - Body ground
    		10 kΩ or higher
    I11-1 (+B) or I6-6 (IG2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE IGNITION COIL ASSEMBLY