ECD SYSTEM(w/o EGR Cooler) Starter Signal Circuit

DESCRIPTION

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.

WIRING DIAGRAM

Refer to DTC P0617 for w/o Smart Entry and Start System.

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.

Tech Tips

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. 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 and ECT / Data List / Primary / Starter Signal.


      Powertrain > Engine and ECT > 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
      Ignition 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

  2. INSPECT ST NO. 1 RELAY (POWER SOURCE)


    1. B003MRMC01
      *1 Engine Room Relay Block and Junction Block
      *2 ST NO. 1 Relay

      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
      ST NO. 1 relay terminal 2 - Body ground Engine cranking 11 to 14 V

      Tech Tips

      The engine does not crank because the relay is not installed.

      Result
      Proceed to
      OK
      NG (for manual transmission)
      NG (for automatic transmission)

    NG (for automatic transmission)

    CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST NO. 1 RELAY) Click here

    NG (for manual transmission)

    CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - ST NO. 1 RELAY) 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. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - 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
      ST NO. 1 relay terminal 1 - Body ground Always Below 1 Ω
      Result
      Result
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH ASSEMBLY OR CLUTCH START SWITCH)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST NO. 1 RELAY - BODY GROUND)

  5. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ST NO. 1 RELAY)


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

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C22-5 - ST NO. 1 relay terminal 2 Always Below 1 Ω
      G49-22 (STA) - ST NO. 1 relay terminal 2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park/neutral position switch assembly.


      Result
      Result
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY

    OK

  7. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - ECM)


    1. Disconnect the ignition switch assembly connector.

    2. Disconnect the park/neutral position switch 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
      G133-2 (ST2) - C22-4 Always Below 1 Ω
      G133-2 (ST2) - G49-11 (NSW) Always Below 1 Ω
      G133-2 (ST2) or C22-4 or G49-11 (NSW) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT IGNITION SWITCH ASSEMBLY


    1. Inspect the ignition switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE IGNITION SWITCH ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH - 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. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B2-1 - ST NO. 1 relay terminal 2 Always Below 1 Ω
      G49-22 (STA) - ST NO. 1 relay terminal 2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT CLUTCH START SWITCH


    1. Inspect the clutch start switch.

      Click here

      Result
      Result
      OK
      NG

    NG

    REPLACE CLUTCH START SWITCH Click here

    OK

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


    1. Disconnect the ignition switch assembly connector.

    2. Disconnect the clutch start switch 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
      G133-2 (ST2) - B2-2 Always Below 1 Ω
      G133-2 (ST2) - G49-11 (NSW) Always Below 1 Ω
      G133-2 (ST2) or B2-2 or G49-11 (NSW) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. INSPECT IGNITION SWITCH ASSEMBLY


    1. Inspect the ignition switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE IGNITION SWITCH ASSEMBLY Click here