ECD SYSTEM(for DPF) Starter Signal Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal ST2 of the ignition or starter switch assembly*1 or terminal STAR of the certification ECU (smart key ECU assembly)*2 to the clutch start switch assembly and to terminal STA of the ECM (STA signal).


WIRING DIAGRAM

A00YTBUE01
A00YWFZE01

CAUTION / NOTICE / HINT

Note


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

  • After replacing the ECM, the new ECM needs registration (Click here ) and initialization Click here.

PROCEDURE


  1. CHECK WHETHER ENGINE CAN BE CRANKED


    1. Check if the engine can be cranked.

      Result
      Proceed to
      Engine cannot be cranked
      Engine can be cranked

    Engine can be cranked

    READ VALUE USING GTS (STARTER SIGNAL) Click here

    Engine cannot be cranked

  2. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.


      Powertrain > Engine > Data List
      Tester Display
      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK
      Switch Position Starter Signal
      ON OFF
      START ON
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT CLUTCH START SWITCH ASSEMBLY Click here

    OK

  3. INSPECT ST RELAY


    1. Inspect the ST relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST RELAY

    OK

  4. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY)


    1. Remove the ST relay from the engine room relay block and junction block assembly.

    2. Disconnect the starter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (ST relay) - B6-1 Always Below 1 Ω
      3 (ST relay) or B6-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF STARTER ASSEMBLY)


    1. Disconnect the starter assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C4-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY)


    1. A00YXOUC03
      *1 Engine Room NO. 2 Relay Block and Junction Block Assembly
      *2 ST Relay

      Remove the ST relay from the engine room NO. 2 relay block and junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 (ST relay) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ST RELAY)

    OK

  8. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)


    1. Remove the ST relay from the engine room NO. 2 relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (ST relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (ST RELAY - CLUTCH START SWITCH ASSEMBLY)


    1. Remove the ST relay from the engine room NO. 2 relay block and junction block assembly.

    2. Disconnect the clutch start switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (ST relay) - A4-1*1 Always Below 1 Ω
      2 (ST relay) - F2-1*2 Always Below 1 Ω

      • *1: LHD

      • *2: RHD

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. INSPECT CLUTCH START SWITCH ASSEMBLY


    1. Inspect the clutch start switch assembly Click here.

      Result
      Proceed to
      OK (w/ entry and start system)
      OK (w/o entry and start system)
      NG

    OK (w/o entry and start system)

    INSPECT IGNITION OR STARTER SWITCH ASSEMBLY Click here

    NG

    REPLACE CLUTCH START SWITCH ASSEMBLY Click here

    OK (w/ entry and start system)

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - CLUTCH START SWITCH ASSEMBLY)


    1. Disconnect the certification ECU (smart key ECU assembly) connector.

    2. Disconnect the clutch start switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G82-5 (STAR) - A4-2*1 Always Below 1 Ω
      G82-5 (STAR) - F2-2*2 Always Below 1 Ω
      G82-5 (STAR) or A4-2*1 - Body ground Always 10 kΩ or higher
      G82-5 (STAR) or F2-2*2 - Body ground Always 10 kΩ or higher

      • *1: LHD

      • *2: RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ECM)


    1. Disconnect the clutch start switch assembly connector.

    2. Remove the ST relay from the engine room relay block and junction block assembly.

    3. Disconnect the ECM connector.

    4. Disconnect the certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A4-1*1 - A61-43 (STA) Always Below 1 Ω
      F2-1*2 - A61-43 (STA) Always Below 1 Ω
      A4-1*1 or A61-43 (STA) - Body ground Always 10 kΩ or higher
      F2-1*2 or A61-43 (STA) - Body ground Always 10 kΩ or higher

      • *1: LHD

      • *2: RHD

      Result
      Proceed to
      OK
      NG

    OK

    GO TO ENTRY AND START SYSTEM

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. INSPECT IGNITION OR STARTER SWITCH ASSEMBLY


    1. Inspect the ignition or starter switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE IGNITION OR STARTER SWITCH ASSEMBLY Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY)


    1. Disconnect the ignition or starter switch assembly connector.

    2. Disconnect the clutch start switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G4-2 (ST2) - A4-2*1 Always Below 1 Ω
      G4-2 (ST2) - F2-2*2 Always Below 1 Ω
      G4-2 (ST2) or A4-2*1 - Body ground Always 10 kΩ or higher
      G4-2 (ST2) or F2-2*2 - Body ground Always 10 kΩ or higher

      • *1: LHD

      • *2: RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - ECM)


    1. Disconnect the clutch start switch assembly connector.

    2. Remove the ST relay from the engine room NO. 2 relay block and junction block assembly.

    3. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A4-1*1 - A61-43 (STA) Always Below 1 Ω
      F2-1*2 - A61-43 (STA) Always Below 1 Ω
      A4-1*1 or A61-43 (STA) - Body ground Always 10 kΩ or higher
      F2-1*2 or A61-43 (STA) - Body ground Always 10 kΩ or higher

      • *1: LHD

      • *2: RHD

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.


      Powertrain > Engine > Data List
      Tester Display
      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is turned to the ON and START positions.

      OK
      Switch Position Starter Signal
      ON OFF
      START ON
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - ECM)