STOP AND START SYSTEM(for 2WW) Starter Signal Circuit

DTC Code DTC Name
Starter Signal Circuit

DESCRIPTION

The engine stop and start ECU can activate the ST relay to operate the starter assembly.

WIRING DIAGRAM

A375866E01
A375867E01
A375868E01

CAUTION / NOTICE / HINT

Note:

  • Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

    Click here

  • After replacing the engine stop and start ECU or airbag sensor assembly, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here

  • After replacing the starter assembly, perform initialization of the number of starter operations stored in the engine stop and start ECU.

    Click here

  • When the starter assembly is replaced, "ST relay" must be also replaced.

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

PROCEDURE

  1. CHECK CRANKING

    1. Turn the ignition switch to START and check that the engine cranks.

    Result

    Result

    Proceed to

    Engine cranks

    A

    Engine does not crank

    B
    B

    PERFORM ACTIVE TEST USING GTS (STARTER)Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (STARTER)

    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 / Stop and Start / Active Test / Starter.

      Powertrain > Stop and Start > Active Test

      Tester Display

      Starter

    5. Check whether the engine cranks while the Active Test "Starter" is being performed.

      Note:

      The Active Test "Starter" is stopped automatically 3 seconds after the starter assembly begins operating.

      Standard

      Engine cranks

    Result

    Proceed to

    OK

    NG
    OK

    GO TO DTC P1603 (CONFIRM CAUSE OF ENGINE STALL)

    Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU POWER SOURCE CIRCUIT)

    A348463C17

    *a

    Front view of wire harness connector

    (to Engine Stop and Start ECU)

    -

    -

    1. Disconnect the engine stop and start ECU connectors.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A86-1 (BIN2) - Body ground

      Always

      9.5 to 14 V

      A86-3 (BIN1) - Body ground

      Always

      9.5 to 14 V

    3. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A66-1 (+B) - Body ground

      Ignition switch ON

      9.5 to 14 V

      G87-18 (IG2) - Body ground

      Ignition switch ON

      9.5 to 14 V

      G87-21 (IG1) - Body ground

      Ignition switch ON

      9.5 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)

    1. Disconnect the A86 and A66 engine stop and start ECU connectors.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A86-2 (GND2) - Body ground

      Always

      Below 1 Ω

      A86-8 (GND1) - Body ground

      Always

      Below 1 Ω

      A66-6 (DGND) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ENGINE STOP AND START ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. PERFORM ACTIVE TEST USING GTS (STARTER)

    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 / Stop and Start / Active Test / Starter.

      Powertrain > Stop and Start > Active Test

      Tester Display

      Starter

    5. Check whether the engine cranks while the Active Test "Starter" is being performed.

      Note:

      The Active Test "Starter" is stopped automatically 3 seconds after the starter assembly begins operating.

      Standard

      Engine cranks

    Result

    Result

    Proceed to

    Engine cranks

    A

    Engine does not crank

    B
    B

    CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND)Click here

    A

  6. READ VALUE USING GTS (CLUTCH LOWER SW)

    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 / Stop and Start / Data List / Clutch Lower SW

    5. In accordance with the display on the GTS, read the Data List.

      Powertrain > Stop and Start > Data List

      Tester Display

      Clutch Lower SW

      OK

      Tester Display

      Condition

      Normal Condition

      Clutch Lower SW

      Fully Depressed

      ON

      Fully Released

      OFF

    Result

    Result

    Proceed to

    Data Monitor display is not within standards

    A

    Data Monitor display is within standards (w/o Entry and Start System)

    B

    Data Monitor display is within standards (w/ Entry and Start System)

    C
    B

    INSPECT IGNITION OR STARTER SWITCH ASSEMBLYClick here

    C

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE STOP AND START ECU)Click here

    A

  7. INSPECT CLUTCH START SWITCH ASSEMBLY (FOR LOWER)

    1. Inspect the clutch start switch assembly (for lower).

      Click here

    Result

    Result

    Proceed to

    OK (w/o Smart Entry and Start System)

    A

    OK (w/ Smart Entry and Start System)

    B

    NG

    C
    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY)Click here

    C

    REPLACE CLUTCH START SWITCH ASSEMBLY (FOR LOWER)

    Click here

    A

  8. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - ST RELAY)

    1. Disconnect the A66 engine stop and start ECU connectors.

    2. Disconnect the G4 ignition or starter switch assembly connector.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G4-2 (ST2) - ST relay terminal 2

      Fully Depressed

      Below 1 Ω

      Fully Released

      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

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY)

    1. Disconnect the G82 certification ECU (smart key ECU assembly) connector.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G82-5 (STAR) - ST relay terminal 2

      Fully Depressed

      Below 1 Ω

      Fully Released

      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

  10. 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

  11. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - BATTERY)

    1. Disconnect the G4 ignition or starter switch assembly connector.

    2. A316828C05

      *a

      Front view of wire harness connector

      (to Ignition or Starter Switch Assembly)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G4-4 (AM2) - Body ground

      Always

      9.5 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (IGNITION OR STARTER SWITCH ASSEMBLY - CLUTCH START SWITCH ASSEMBLY (FOR LOWER))

    1. Disconnect the G4 ignition or starter switch assembly connector.

    2. Disconnect the A66 engine stop and start ECU connector.

    3. Disconnect the A4*1 or F2*2 clutch start switch assembly (for lower) connector.

      • *1: for LHD

      • *2: for RHD

    4. Disconnect the A62 ECM connector.

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

      Standard Resistance

      Table 1. for LHD:

      Tester Connection

      Condition

      Specified Condition

      G4-2 (ST2) - A4-2

      Always

      Below 1 Ω

      G4-2 (ST2) - Body ground

      Always

      10 kΩ or higher

      A4-2 - Body ground

      Always

      10 kΩ or higher

      A66-17 (CLL) - Body ground

      Always

      10 kΩ or higher
      Table 2. for RHD:

      Tester Connection

      Condition

      Specified Condition

      G4-2 (ST2) - F2-2

      Always

      Below 1 Ω

      G4-2 (ST2) - Body ground

      Always

      10 kΩ or higher

      F2-2 - Body ground

      Always

      10 kΩ or higher

      A66-17 (CLL) - Body ground

      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

  13. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ENGINE STOP AND START ECU)

    1. Disconnect the G82 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A66 engine stop and start ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G82-5 (STAR) - A66-17 (CLL)

      Always

      Below 1 Ω

      G82-5 (STAR) - Body ground

      Always

      10 kΩ or higher

      A66-17 (CLL) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (STAR SIGNAL)

    1. A342958C23

      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      Disconnect the engine stop and start ECU connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A66-17 (CLL) - Body ground

      Engine started using push start switch assembly (ignition switch turned START)

      9.5 to 14 V

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    GO TO SMART ENTRY AND START SYSTEM

    Click here

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

    1. Remove the ST relay from the No. 2 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 relay terminal 2 - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST RELAY)

    1. w/ Entry and Start System:

      Disconnect the G82 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A66 engine stop and start ECU connector.

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

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A66-21 (STA) - ST relay terminal 2

      Always

      Below 1 Ω

      A66-21 (STA) - Body ground

      Always

      10 kΩ or higher

      ST relay terminal 2 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. INSPECT STARTER ASSEMBLY

    1. Inspect the starter assembly.

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPLACE STARTER ASSEMBLY

    Click here