SFI SYSTEM Ignition Circuit

DTC Code DTC Name
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

Refer to DTC P0351.

Click here

CAUTION / NOTICE / HINT

Note:

  • After replacing the ECM, perform idle learning.

    Click here

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

PROCEDURE

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

    A383574C07

    *a

    Front view of wire harness connector

    (to No. 1 Ignition Coil)

    1. Disconnect the No. 1 ignition coil connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      B58-1 (+B) - B58-3 (GND)

      Ignition switch ON

      11 to 14 V

      B59-1 (+B) - B59-3 (GND)

      Ignition switch ON

      11 to 14 V

      B60-1 (+B) - B60-3 (GND)

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

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

    1. Disconnect the ECM connector.

    2. Disconnect the No. 1 ignition coil connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B31-27 (IGT1) - B58-2 (IGT)

      Always

      Below 1 Ω

      B31-57 (IGT2) - B59-2 (IGT2)

      Always

      Below 1 Ω

      B31-56 (IGT3) - B60-2 (IGT3)

      Always

      Below 1 Ω

      B31-27 (IGT1) or B58-2 (IGT) - Body ground

      Always

      10 kΩ or higher

      B31-57 (IGT2) or B59-2 (IGT2) - Body ground

      Always

      10 kΩ or higher

      B31-56 (IGT3) or B60-2 (IGT3) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    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 connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B58-3 (GND) - Body ground

      Always

      Below 1 Ω

      B59-3 (GND) - Body ground

      Always

      Below 1 Ω

      B60-3 (GND) - Body ground

      Always

      Below 1 Ω

    Result

    Result

    Proceed to

    OK (w/ entry and start system)

    A

    OK (w/o entry and start system)

    B

    NG

    C
    B

    CHECK HARNESS AND CONNECTOR (NO. 1 IGNITION COIL - IGNITION OR STARTER SWITCH ASSEMBLY)Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  4. CHECK HARNESS AND CONNECTOR (NO. 1 IGNITION COIL - IG2 RELAY)

    1. Disconnect the No. 1 ignition coil connectors.

    2. Remove the IG2 relay from the center relay block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B58-1 (+B) - 5 (IG2 relay)

      Always

      Below 1 Ω

      B59-1 (+B) - 5 (IG2 relay)

      Always

      Below 1 Ω

      B60-1 (+B) - 5 (IG2 relay)

      Always

      Below 1 Ω

      B58-1 (+B) or 5 (IG2 relay) - Body ground

      Always

      10 kΩ or higher

      B59-1 (+B) or 5 (IG2 relay) - Body ground

      Always

      10 kΩ or higher

      B60-1 (+B) or 5 (IG2 relay) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ECM POWER SOURCE CIRCUIT

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (NO. 1 IGNITION COIL - IGNITION OR STARTER SWITCH ASSEMBLY)

    1. Disconnect the No. 1 ignition coil connectors.

    2. Disconnect the ignition or starter switch assembly connector.

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

    Standard Resistance

    Tester Connection

    Condition

    Specified Condition

    B58-1 (+B) - E21-6 (IG2)

    Always

    Below 1 Ω

    B59-1 (+B) - E21-6 (IG2)

    Always

    Below 1 Ω

    B60-1 (+B) - E21-6 (IG2)

    Always

    Below 1 Ω

    B58-1 (+B) or E21-6 (IG2) - Body ground

    Always

    10 kΩ or higher

    B59-1 (+B) or E21-6 (IG2) - Body ground

    Always

    10 kΩ or higher

    B60-1 (+B) or E21-6 (IG2) - Body ground

    Always

    10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    GO TO ECM POWER SOURCE CIRCUIT

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR