STOP AND START SYSTEM Starter Signal Circuit

DESCRIPTION

By using the starter delay circuit, the engine stop and start ECU can activate the ST NO. 2 relay (for starter motor operation) after activating the ST NO. 1 relay (for starter pinion operation) to operate the starter assembly.

WIRING DIAGRAM

B003VQ3E12
B003SV6E01

CAUTION / NOTICE / HINT

Note


  • Before replacing the engine stop and start ECU, read the number of starter operations and total number of engine starts 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 yaw rate sensor, clear and calibrate the deceleration sensor zero point in the engine stop and start ECU.

    Click here

  • When the engine stop and start ECU is replaced, check the oil pump assembly with solenoid.

    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 NO. 1 relay" and "ST NO. 2 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 engine switch on (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 engine switch on (IG).

    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)


    1. Disconnect the A93, A94 and K139 engine stop and start ECU connectors.

      B003VNFC06
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A93-1 (BIN2) - Body ground Always 9.5 to 14 V
      A93-3 (BIN1) - Body ground Always 9.5 to 14 V

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A94-1 (+B) - Body ground Engine switch on (IG) 9.5 to 14 V
      K139-18 (IG2) - Body ground Engine switch on (IG) 9.5 to 14 V
      K139-21 (IG1) - Body ground Engine switch on (IG) 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 A93 and A94 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
      A93-2 (GND2) - Body ground Always Below 1 Ω
      A93-8 (GND1) - Body ground Always Below 1 Ω
      A94-6 (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 engine switch on (IG).

    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 ENGINE STOP AND START ECU (STA, STA2 SIGNAL) Click here

    A

  6. READ VALUE USING GTS (NEUTRAL SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Stop and Start / Data List / Neutral Switch.

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


      Powertrain > Stop and Start > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Neutral Switch Park/neutral position assembly status ON / OFF

      ON: Shift lever in P or N

      OFF: Shift lever not in P or N

      		 -

      Powertrain > Stop and Start > Data List
      Tester Display
      Neutral Switch
      OK
      Tester Display Condition Normal Condition
      Neutral Switch Shift lever in P or N ON
      Shift lever not in P or N OFF
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  7. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY


    1. Inspect the park/neutral position switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A13 certification ECU (smart key ECU assembly) connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-10 (STAR) - ST NO. 1 relay terminal 2 Shift lever in P or N Below 1 Ω
      A13-10 (STAR) - ST NO. 1 relay terminal 2 Shift lever not in P or N 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) - ENGINE STOP AND START ECU)


    1. Disconnect the F54 park/neutral position switch assembly connector.

    2. Disconnect the A13 certification ECU (smart key ECU assembly) connector.

    3. Disconnect the A94 engine stop and start ECU connector.

    4. Disconnect the A96 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-10 (STAR) - A94-17 (CLL) Always Below 1 Ω
      A13-10 (STAR) - Body ground Always 10 kΩ or higher
      A94-17 (CLL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B003T6NC12
      *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
      A94-17 (CLL) - Body ground Engine started using engine switch (engine switch turned on (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

  11. CHECK ENGINE STOP AND START ECU (STA, STA2 SIGNAL)


    1. Connect an oscilloscope to the A94-21 (STA), A94-23 (STA2) and A94-6 (DGND) terminals of the engine stop and start ECU connector.

      B003VSDC52
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -
    2. B003VRGE18
      *1 (ST NO. 1 Relay)
      *2 (ST NO. 2 Relay)
      *3 0.03 to 0.06 seconds

      Check the waveform immediately after turning the engine switch on (START).

      Item Condition
      Tester Connection

      A94-21 (STA) - A94-6 (DGND)

      A94-23 (STA2) - A94-6 (DGND)
      Condition Engine started by engine switch operation
      Result
      Result Proceed to
      Delay between ST NO. 1 relay turning on and ST NO. 2 relay turning on: between 0.03 and 0.06 seconds A
      Delay between ST NO. 1 relay turning on and ST NO. 2 relay turning on: not between 0.03 and 0.06 seconds B
      ST NO. 1 relay turns on and ST NO. 2 relay does not turn on C
      ST NO. 1 relay and ST NO. 2 relay do not turn on D

      Note

      After replacing the engine stop and start ECU, make sure that the drive plate and ring gear sub-assembly and starter pinion gear are not excessively worn. A malfunction in the delay circuit may cause the drive plate and ring gear sub-assembly or starter pinion gear to be worn or damaged.


    B

    REPLACE ENGINE STOP AND START ECU Click here

    C

    CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU POWER SOURCE CIRCUIT) Click here

    D

    GO TO STEP 15 Click here

    A

  12. INSPECT RELAY (ST NO. 1, ST NO. 2 RELAY)


    1. Inspect the ST NO. 1 relay.

      Click here

    2. Inspect the ST NO. 2 relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (ST NO. 1, ST NO. 2 RELAY)

    OK

  13. CHECK HARNESS AND CONNECTOR (ST NO. 1, ST NO. 2 RELAY - BATTERY)

    B003VKQC02
    *1 No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
    *a ST NO. 1 Relay Terminal
    *b ST NO. 2 Relay Terminal

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

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

    3. 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 9.5 to 14 V
      ST NO. 2 relay terminal 5 - Body ground Always 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK HARNESS AND CONNECTOR (ST NO. 1, ST NO. 2 RELAY - STARTER ASSEMBLY)


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

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

    3. Disconnect the F98 starter assembly connector.

    4. 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 - F98-2 (SL1) Always Below 1 Ω
      ST NO. 2 relay terminal 3 - F98-1 (SL2) Always Below 1 Ω
      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. Remove the ST NO. 1 relay from the No. 2 engine room relay block and No. 2 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

  17. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST NO. 1 RELAY)


    1. Disconnect the A13 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the F54 park/neutral position switch assembly connector.

    3. Disconnect the A94 engine stop and start ECU connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A94-21 (STA) - ST NO. 1 relay terminal 2 Always Below 1 Ω
      A94-21 (STA) - Body ground Always 10 kΩ or higher
      ST NO. 1 relay terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST NO. 2 RELAY)


    1. Disconnect the A91 ECM connector.

    2. Disconnect the A94 engine stop and start ECU connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A94-23 (STA2) - ST NO. 2 relay terminal 2 Always Below 1 Ω
      A94-23 (STA2) - Body ground Always 10 kΩ or higher
      ST NO. 2 relay terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  19. CHECK STARTER SIGNAL (OUTPUT WAVEFORM)


    1. Enter the following menus: Powertrain / Stop and Start / Active Test / Starter Motor Drive Magnet Switch.

    2. Connect the positive (+) lead of an oscilloscope to the positive (+) battery terminal and the negative (-) lead to the negative (-) battery terminal.

    3. While performing the Active Test "Starter Motor Drive Magnet Switch" to forcibly operate the starter motor, count the number of times the waveform drops.

      Note


      • The Active Test "Starter Motor Drive Magnet Switch" is stopped automatically after the starter motor operates for 3 seconds.

      • Do not forcibly operate the starter pinion.

      B003WK8E02
      Standard
      Waveform drops 2 times
      Result
      Number of Times Waveform Dropped Proceed to
      0 times A
      2 times B

    B

    INSPECT STARTER ASSEMBLY Click here

    A

  20. INSPECT STARTER INRUSH CURRENT REDUCTION RELAY


    1. B003V4NC01
      *1 Starter Assembly
      *a B Terminal
      *b M Terminal

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect terminals B and M of the starter inrush current reduction relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B Terminal - M Terminal Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT STARTER ASSEMBLY (M TERMINAL) Click here

    OK

  21. INSPECT STARTER ASSEMBLY (C TERMINAL)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. B003WLOC01
      *1 Starter Assembly
      *a Inspect Part
      *b C Terminal
      *c B Terminal

      Disconnect terminal B of the starter inrush current reduction relay.

    3. Disconnect terminal C of the starter assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C Terminal - B Terminal Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STARTER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  22. INSPECT STARTER ASSEMBLY (M TERMINAL)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. B003ULUC01
      *1 Starter Assembly
      *a Inspect Part
      *b M Terminal

      Disconnect terminal M of the starter inrush current reduction relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M Terminal - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STARTER INRUSH CURRENT REDUCTION RELAY Click here

    NG

    REPLACE STARTER ASSEMBLY Click here

  23. 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

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


    1. Disconnect the A93, A94 and K139 engine stop and start ECU connectors.

      B003VNFC06
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A93-1 (BIN2) - Body ground Always 9.5 to 14 V
      A93-3 (BIN1) - Body ground Always 9.5 to 14 V

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A94-1 (+B) - Body ground Engine switch on (IG) 9.5 to 14 V
      K139-18 (IG2) - Body ground Engine switch on (IG) 9.5 to 14 V
      K139-21 (IG1) - Body ground Engine switch on (IG) 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A93 and A94 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
      A93-2 (GND2) - Body ground Always Below 1 Ω
      A93-8 (GND1) - Body ground Always Below 1 Ω
      A94-6 (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