EMISSION CONTROL SYSTEM ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned ON, battery positive voltage is applied to the coil, supplying power to the terminal +B of the emission ECU.

WIRING DIAGRAM

A01KI54E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK EMISSION CONTROL ECU


    1. Turn the ignition switch ON.

    2. A01KHLFE07

      Measure the voltage between terminals +B and E1 of the emission ECU. Click here

      VOLTAGE
      9 - 14 V

    OK

    GO TO PROBLEM SYMPTOMS TABLE Click here

    NG

  2. CHECK WIRE HARNESS OR CONNECTOR (ECU GROUND)


    1. Disconnect the battery negative cable.

    2. Disconnect the emission ECU connector.

    3. A01KH0WE07

      Check for open between terminal E1 of the emission ECU E1 connector and body ground Click here.

      RESISTANCE
      1 Ω or less

    NG

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR

    OK

  3. CHECK FUSE (ECU-IG)


    1. Remove the ECU-IG fuse from the R/B NO.1.

    2. A01KEP9E02
      Text in Illustration
      *1 ECU-IG

      Check the continuity of the ECU-IG fuse.

      OK
      CONTINUITY

    NG

    REPLACE FUSE (ECU-IG)

    OK

  4. CHECK IGNITION OR STARTER SWITCH ASSEMBLY


    1. A01KGDUE01

      Remove the lower finish panel.

    2. Disconnect the ignition switch connector.

    3. Check the continuity between the terminals shown below.

      OK
      Switch Position Terminal No. to continuity
      LOCK - -
      ACC 4 - 9 -
      ON 4 - 9 - 10 5 - 8
      START 3 - 9 - 10 5 - 8

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY

    OK

  5. CHECK WIRE HARNESS (EMISSION ECU - IGNITION SWITCH)


    1. Remove the lower finish panel.

    2. Disconnect the ignition switch connector.

    3. Disconnect the emission ECU connector.

    4. A01KH0WE08

      Check the continuity between terminals 2 of the ignition switch harness connector and +B of the ECU connector Click here.

      RESISTANCE
      1 Ω or less
    5. A01KG2D

      Check for short between terminals 2 of the ignition switch harness connector and +B of the ECU connector Click here.

      RESISTANCE
      1 MΩ or more

    NG

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR

    OK

  6. CHECK FUSE (AM1)


    1. A01KFG2E02
      Text in Illustration
      *1 AM1

      Remove the AM1 fuse from the R/B No.2.

    2. Check the continuity of the AM1 fuse.

      OK
      CONTINUITY

    NG

    REPLACE FUSE (AM1)

    OK

    REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR (IGNITION SWITCH-BATTERY)