ECD SYSTEM Cranking Holding Function Circuit

DESCRIPTION

While the engine is being cranked, current flows from terminal STAR of the certification ECU (smart key ECU assembly) to the park/neutral position switch assembly and to terminal STA of the ECM (STA signal).

WIRING DIAGRAM

Refer to DTC P0617

Click here

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.

  • Read Starter Count before replacing the engine stop and start ECU, perform the replacement procedure, and then write Starter Count to the newly installed engine stop and start ECU.

  • When replacing the engine stop and start ECU or the air conditioning amplifier assembly, initialize and learn the engine stop and start ECU air conditioning information.

  • When replacing the engine stop and start ECU or airbag ECU assembly (G sensor), initialize and learn the engine stop and start ECU G sensor zero point learned information.

PROCEDURE


  1. CHECK WHETHER ENGINE CAN BE CRANKED


    1. Check if the engine can be cranked.

      Result
      Result Proceed to
      Engine cannot be cranked A
      Engine can be cranked B

    B

    READ VALUE USING GTS (STARTER SIGNAL) Click here

    A

  2. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Primary / Starter Signal.


      Powertrain > Engine > Data List
      Tester Display
      Starter Signal

    5. Check the result when the ignition switch is ON and the engine starts.

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

    NG

    INSPECT CLUTCH START SWITCH Click here

    OK

  3. INSPECT ST NO. 1 RELAY


    1. Inspect the ST NO. 1 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST NO. 1 RELAY

    OK

  4. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STARTER ASSEMBLY for 2.0 kW Type Click here for 2.2 kW Type Click here for 2.7 kW Type Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - STARTER ASSEMBLY)


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

    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 NO. 1 relay terminal holder) - C32-1 Always Below 1 Ω
      3 (ST NO. 1 relay terminal holder) or C32-1 - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BATTERY - 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
      D3-1 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (ST NO. 1 RELAY - BODY GROUND)


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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (ST NO. 1 relay terminal holder) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST NO. 1 RELAY)


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

    2. Disconnect the clutch start switch connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-1 - 2 (ST NO. 1 relay terminal holder) Always Below 1 Ω
      G70-37 (STA) - 2 (ST NO. 1 relay terminal holder) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (BATTERY - ST NO. 1 RELAY)


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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      5 (ST NO. 1 relay terminal holder) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    GO TO SMART ENTRY AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. INSPECT CLUTCH START SWITCH


    1. Inspect the clutch start switch.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CLUTCH START SWITCH

    OK

  11. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ECM - ST NO. 1 RELAY - CERTIFICATION ECU)


    1. Disconnect the clutch start switch connector.

    2. Disconnect the ECM connector.

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

    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
      B2-1 - G84-7 (STA) Always Below 1 Ω
      B2-1 or G84-7 (STA) or 2 (ST NO. 1 relay terminal holder) or G70-37 (STA) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the clutch start switch connector.

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

    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
      G70-16 (STAR) - B2-2 Always Below 1 Ω
      G70-16 (STAR) - G84-6 (NSW) Always Below 1 Ω
      G70-16 (STAR) or B2-2 or G84-6 (NSW) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO SMART ENTRY AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. READ VALUE USING GTS (STARTER SIGNAL)


    1. Connect the GTS to DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Primary / Starter Signal.


      Powertrain > Engine > Data List
      Tester Display
      Starter Signal

    5. Check the result when the ignition switch is ON and the engine starts.

      OK
      Switch Condition 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 NO. 1 RELAY - ECM)