ECD SYSTEM(w/ Urea SCR System) Starter Signal Circuit

DESCRIPTION

w/o Stop and Start System

While the engine is being cranked, the starter signal is also sent to terminal STA of the ECM. The starter signal mainly performs engine control when the engine is started.

w/ Stop and Start System

While the engine is being cranked, the ECM detects the starter drive signal (STA2 signal) from the engine stop and start ECU as the starter operation signal (STA signal) to perform engine control when the engine is started.

WIRING DIAGRAM

Refer to DTC P0617.

Click here

CAUTION / NOTICE / HINT

Note


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

Tech Tips

w/o Stop and Start System

This procedure is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to the problem symptoms table.

Click here

PROCEDURE


  1. CHECK IF VEHICLE IS EQUIPPED WITH STOP AND START SYSTEM


    1. Confirm the vehicle specifications.

      Result
      Result
      w/ Stop and Start System
      w/o Stop and Start System

    w/ Stop and Start System

    CHECK WHETHER ENGINE CAN BE CRANKED Click here

    w/o Stop and Start System

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

      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

  3. CHECK HARNESS AND CONNECTOR (ECM - CLUTCH START SWITCH ASSEMBLY OR PARK/NEUTRAL POSITION SWITCH ASSEMBLY)

    Tech Tips


    • *1: for Manual Transmission

    • *2: for Automatic Transmission


    1. Disconnect the ECM connector.

    2. Disconnect the clutch start switch assembly connector.*1

    3. Disconnect the park/neutral position switch assembly connector.*2

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G85-22 (STA) - B2-1*1 Always Below 1 Ω
      G85-22 (STA) - C24-5*2 Always Below 1 Ω
      G85-22 (STA) or B2-1*1 - Body ground and other terminals Always 10 kΩ or higher
      G85-22 (STA) or C24-5*2 - Body ground and other terminals Always 10 kΩ or higher
      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

  4. 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

  5. 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 / Data List / Primary / Starter Signal.


      Powertrain > Engine > Data List
      Tester Display
      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is ON and the engine stars.

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

    NG

    GO TO STOP AND START SYSTEM (STARTER SIGNAL CIRCUIT) Click here

    OK

  6. INSPECT ST NO. 2 RELAY


    1. Inspect the ST NO. 2 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ST NO. 2 RELAY

    OK

  7. 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

  8. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (ST NO. 2 RELAY - STARTER ASSEMBLY)


    1. Remove the ST NO. 2 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
      ST NO. 2 relay terminal 3 - C141-2 (SL2) Always Below 1 Ω
      ST NO. 2 relay terminal 3 - C140-1 (ST) Always Below 1 Ω
      ST NO. 2 relay terminal 3 or C141-2 (SL2) - Body ground and other terminals Always 10 kΩ or higher
      ST NO. 2 relay terminal 3 or C140-1 (ST) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (ST NO. 2 RELAY - ECM)


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

    2. Disconnect the ECM connector.

    3. Disconnect the engine stop and start ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST NO. 2 relay terminal 2 - G85-22 (STA) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (ST NO. 2 RELAY - BODY GROUND)


    1. A01WBQTC01
      *1 Engine Room Relay Block and Junction Block Assembly
      *a ST NO. 2 Relay Terminal

      Remove the ST NO. 2 relay from the engine room 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
      ST NO. 2 relay terminal 1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (BATTERY - ST NO. 2 RELAY)


    1. A01WBQTC01
      *1 Engine Room Relay Block and Junction Block Assembly
      *a ST NO. 2 Relay Terminal

      Remove the ST NO. 2 relay from the engine room 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
      ST NO. 2 relay terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01WBRZC01
      *1 Engine Room Relay Block and Junction Block Assembly
      *a ST NO. 1 Relay Terminal

      Remove the ST NO. 1 relay from the engine room 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
      ST NO. 1 relay terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. 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 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
      ST NO. 1 relay terminal 3 - C141-1 (SL1) Always Below 1 Ω
      ST NO. 1 relay terminal 3 or C141-1 (SL1) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01WBRZC01
      *1 Engine Room Relay Block and Junction Block Assembly
      *a ST NO. 1 Relay Terminal

      Remove the ST NO. 1 relay from the engine room 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
      ST NO. 1 relay terminal 1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER 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 / Data List / Primary / Starter Signal.


      Powertrain > Engine > Data List
      Tester Display
      Starter Signal

    5. Check the value displayed on the GTS when the ignition switch is ON and the engine stars.

      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. 2 RELAY - ECM)