SFI SYSTEM Ignition Circuit

DESCRIPTION

A direct ignition system is used on this vehicle. The direct ignition system is a 1 cylinder ignition system which ignites one cylinder with one No. 1 ignition coil . In the 1 cylinder ignition system, one spark plug is connected to the end of the secondary winding. High voltage is generated in the secondary winding and 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 transmits the ignition signals for each cylinder. Using the ignition signal, the ECM turns ON and OFF the power transistor inside the igniter, which switches ON and OFF a current to the primary coil. When the 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.

WIRING DIAGRAM

A01VEHTE01
A01VEHTE02

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 IGNITION COIL)

    A01VFE3E01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 1 Ignition Coil)

    1. Disconnect the No. 1 ignition coil connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B14-1 (+B) - B14-4 (GND) Ignition switch ON 11 to 14 V
      B16-1 (+B) - B16-4 (GND) Ignition switch ON 11 to 14 V
      B18-1 (+B) - B18-4 (GND) Ignition switch ON 11 to 14 V
      B20-1 (+B) - B20-4 (GND) Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 IGNITION COIL - BODY GROUND) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 1 IGNITION COIL - ECM)


    1. Disconnect the ECM connector.

    2. Disconnect the No. 1 ignition coil connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B22-57 (IGT1) - B14-3 (IGT1) Always Below 1 Ω
      B22-56 (IGT2) - B16-3 (IGT2) Always Below 1 Ω
      B22-55 (IGT3) - B18-3 (IGT3) Always Below 1 Ω
      B22-54 (IGT4) - B20-3 (IGT4) Always Below 1 Ω
      B22-57 (IGT1) or B14-3 (IGT1) - Body ground Always 10 kΩ or higher
      B22-56 (IGT2) or B16-3 (IGT2) - Body ground Always 10 kΩ or higher
      B22-55 (IGT3) or B18-3 (IGT3) - Body ground Always 10 kΩ or higher
      B22-54 (IGT4) or B20-3 (IGT4) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B23-57 (IGT1) - B14-3 (IGT1) Always Below 1 Ω
      B23-56 (IGT2) - B16-3 (IGT2) Always Below 1 Ω
      B23-55 (IGT3) - B18-3 (IGT3) Always Below 1 Ω
      B23-54 (IGT4) - B20-3 (IGT4) Always Below 1 Ω
      B23-57 (IGT1) or B14-3 (IGT1) - Body ground Always 10 kΩ or higher
      B23-56 (IGT2) or B16-3 (IGT2) - Body ground Always 10 kΩ or higher
      B23-55 (IGT3) or B18-3 (IGT3) - Body ground Always 10 kΩ or higher
      B23-54 (IGT4) or B20-3 (IGT4) - Body ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (NO. 1 IGNITION COIL - BODY GROUND)


    1. Disconnect the No. 1 ignition coil connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B14-4 (GND) - Body ground Always Below 1 Ω
      B16-4 (GND) - Body ground Always Below 1 Ω
      B18-4 (GND) - Body ground Always Below 1 Ω
      B20-4 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 1 IGNITION COIL - NO. 1 INTEGRATION RELAY)


    1. Disconnect the No. 1 ignition coil connector.

    2. Remove the No. 1 integration relay from the engine room relay block.

    3. Disconnect the No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B14-1 (+B) - 1E-2 Always Below 1 Ω
      B16-1 (+B) - 1E-2 Always Below 1 Ω
      B18-1 (+B) - 1E-2 Always Below 1 Ω
      B20-1 (+B) - 1E-2 Always Below 1 Ω
      B14-1 (+B) or 1E-2 - Body ground Always 10 kΩ or higher
      B16-1 (+B) or 1E-2 - Body ground Always 10 kΩ or higher
      B18-1 (+B) or 1E-2 - Body ground Always 10 kΩ or higher
      B20-1 (+B) or 1E-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)


    1. Inspect the No. 1 integration relay Click here.


    OK

    CHECK ECM POWER SOURCE CIRCUIT Click here

    NG

    REPLACE NO. 1 INTEGRATION RELAY Click here