ECD SYSTEM ECM Power Source Circuit

DESCRIPTION

When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM.

The output signal from the MREL terminal of the ECM causes current to flow to the coil, closing the contacts of the integration relay (ECD relay) and supplying power to terminal +B of the ECM.

WIRING DIAGRAM

A0117A2E02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (BATTERY - INTEGRATION RELAY)


    1. A0118VME01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)

      Remove the integration relay from the engine room relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1A-1 - Body ground Always 11 to 14 V

    3. Reconnect the integration relay connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)


    1. A0117OJE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)

      Remove the integration relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1C-6 - Body ground Always Below 1 Ω

    3. Reconnect the integration relay connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0119RDE01
      Text in Illustration
      *1

      Lower view of component without harness connected

      (Integration Relay)

      Remove the integration relay from the engine room relay block.

    2. Disconnect the integration relay connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-1 - 1B-7 When battery voltage absent 10 kΩ or higher
      When battery voltage applied to terminals 1D-12 and 1C-6 Below 1 Ω

    4. Reconnect the integration relay connectors.

    5. Reinstall the integration relay.

      Result
      Result Proceed to
      OK A
      NG (w/ Entry and Start System) B
      NG (w/o Entry and Start System) C

    B

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - INTEGRATION RELAY) Click here

    C

    CHECK HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH - INTEGRATION RELAY) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY)


    1. A011A6CE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)
      *2

      Front view of wire harness connector

      (to ECM)

      Remove the integration relay from the engine room relay block.

    2. Disconnect the integration relay connector.

    3. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      1B-7 - A19-7 (IGSW) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      1B-7 or A19-7 (IGSW) - Body ground Always 10 kΩ or higher

    5. Reconnect the power source control ECU connector.

    6. Reconnect the integration relay connectors.

    7. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0119RDE01
      Text in Illustration
      *1

      Lower view of component without harness connected

      (Integration Relay)

      Remove the integration relay from the engine room relay block.

    2. Disconnect the integration relay connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      1A-1 - 1B-5

      1A-1 - 1B-6

      		 When battery voltage absent 10 kΩ or higher
      When battery voltage applied to terminals 1B-8 and 1C-6 Below 1 Ω

    4. Reconnect the integration relay connectors.

    5. Reinstall the integration relay.


    NG

    REPLACE INTEGRATION NO.1 RELAY Click here

    OK

  6. INSPECT INTEGRATION NO.1 RELAY


    1. A01190VE01
      Text in Illustration
      *1

      Upper view of component without harness connected

      (Integration Relay)
      *2

      Lower view of component without harness connected

      (Integration Relay)

      Remove the integration relay from the engine room relay block.

    2. Disconnect the integration relay connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      1A-1 - 1B-1

      1A-1 - 1E-7

      1A-1 - 1F-7

      1A-1 - 1F-8

      1A-1 - 1F-10

      1A-1 - 1F-11

      		 When battery voltage absent 10 kΩ or higher
      When battery voltage applied to terminals 1B-8 and 1C-6 Below 1 Ω

    4. Reconnect the integration relay connectors.

    5. Reinstall the integration relay.


    OK

    CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY) Click here

    NG

    REPLACE INTEGRATION NO.1 RELAY Click here

  7. CHECK HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH - INTEGRATION RELAY)


    1. A0117ILE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)
      *2

      Front view of wire harness connector

      (to Ignition Switch)

      Remove the integration relay from the engine room relay block.

    2. Disconnect the integration relay connector.

    3. Disconnect the ignition switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-12 - D28-6 (IG2) Always Below 1 Ω
      D28-7 (AM2) - Battery positive terminal Always Below 1 Ω

    5. Reconnect the integration relay connectors.

    6. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT IGNITION SWITCH


    1. A0116W8E01
      Text in Illustration
      *1

      Component without harness connected

      (Ignition Switch)

      Remove the ignition switch.

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

      Standard Resistance (Check for Open)
      Tester Connection Switch Condition Specified Condition
      All terminals LOCK 10 kΩ or higher
      2 - 3 ACC Below 1 Ω
      2 - 3 - 4, 6 - 7 ON Below 1 Ω
      1 - 2 - 4, 6 - 7 - 8 START Below 1 Ω

    3. Reconnect the integration relay connectors.

    4. Reinstall the integration relay.


    NG

    REPLACE IGNITION SWITCH Click here

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  9. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - INTEGRATION RELAY)


    1. A0118VUE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)
      *2

      Front view of wire harness connector

      (to Power Source Control ECU)

      Remove the integration relay from the engine room relay block.

    2. Disconnect the integration relay connector.

    3. Disconnect the power source control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-12 - D72-8 (IG2D) Always Below 1 Ω

    5. Reconnect the power source control ECU connector.

    6. Reconnect the integration relay connectors.

    7. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    CHECK POWER SOURCE CONTROL ECU

  10. CHECK HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY)


    1. A011A6CE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Integration Relay)
      *2

      Front view of wire harness connector

      (to ECM)

      Remove the integration relay from the engine room relay block.

    2. Disconnect the integration relay connector.

    3. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      1B-8 - A19-22 (MREL) Always Below 1 Ω
      1B-5 - A19-1 (+B) Always Below 1 Ω
      1B-6 - A19-61 (+B1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      1B-8 or A19-22 (MREL) - Body ground Always 10 kΩ or higher
      1B-5 or A19-1 (+B) - Body ground Always 10 kΩ or higher
      1B-6 or A19-61 (+B1) - Body ground Always 10 kΩ or higher

    5. Reconnect the power source control ECU connector.

    6. Reconnect the integration relay connectors.

    7. Reinstall the integration relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here