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 relay (for starter pinion operation) to operate the starter assembly.

WIRING DIAGRAM

B0057AOE01
B005A19E01

CAUTION / NOTICE / HINT

Note


  • for 8AR-FTS:

    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

  • for 3ZR-FAE:

    When replacing the engine stop and start ECU with a new one, make sure to download the previous status (number of starter operations) of the old engine stop and start ECU. After replacing the engine stop and start ECU, turn the engine switch on (IG) and wait 20 seconds, then confirm that "OK" is displayed for the Data List item "Stop&Start Operating Permission (Discharged Oil Pump Air)". Then upload the previous status (number of starter operations) to the 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 ECU 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

  • 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(HOOD CLOSE)) Click here

    A

  2. PERFORM ACTIVE TEST USING GTS (STARTER(HOOD CLOSE))


    1. Check that the engine hood is closed.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Stop and Start / Active Test / Starter(Hood Close).


      Powertrain > Stop and Start > Active Test
      Tester Display
      Starter(Hood Close)

    6. Check whether the engine cranks while the Active Test "Starter(Hood Close)" is being performed.

      Note

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

      Standard
      Engine cranks
      Result
      Proceed to
      OK
      NG

    OK

    GO TO DTC P160300 (CONFIRM CAUSE OF ENGINE STALL) Click here

    NG

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


    1. Disconnect the A73, A38 and I57 engine stop and start ECU connectors.

      B0058Z3C28
      *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
      A73-1 (BIN2) - Body ground Always 9.5 to 14 V
      A73-3 (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
      A38-1 (+B) - Body ground Engine switch on (IG) 9.5 to 14 V
      I57-18 (IG2) - Body ground Engine switch on (IG) 9.5 to 14 V
      I57-21 (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 A73 and A38 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
      A73-2 (GND2) - Body ground Always Below 1 Ω
      A73-8 (GND1) - Body ground Always Below 1 Ω
      A38-6 (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(HOOD CLOSE))


    1. Check that the engine hood is closed.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Stop and Start / Active Test / Starter(Hood Close).


      Powertrain > Stop and Start > Active Test
      Tester Display
      Starter(Hood Close)

    6. Check whether the engine cranks while the Active Test "Starter(Hood Close)" is being performed.

      Note

      The Active Test "Starter(Hood Close)" 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
      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.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY for U661E: Click here for U661F: Click here for K114: Click here for K114F: Click here

    OK

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


    1. Disconnect the I51 certification ECU (smart key ECU assembly) connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I51-10 (STAR) - ST relay terminal 2 Shift lever in P or N Below 1 Ω
      I51-10 (STAR) - ST 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 I51 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the A38 engine stop and start ECU connector.

    3. Disconnect the C14 park/neutral position switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I51-10 (STAR) - A38-17 (CLL) Always Below 1 Ω
      I51-10 (STAR) - Body ground Always 10 kΩ or higher
      A38-17 (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. B0058VGC24
      *a

      Front view of wire harness connector

      (to Engine Stop and Start ECU)

      Disconnect the A38 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
      A38-17 (CLL) - Body ground Engine started using engine switch (engine switch turned on (START)) 9.5 to 14 V
      Result
      Proceed to
      OK
      NG (w/ Entry and Start System)
      NG (w/o Entry and Start System)

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG (w/ Entry and Start System)

    GO TO ENTRY AND START SYSTEM Click here

    NG (w/o Entry and Start System)

    GO TO PUSH-BUTTON START Click here

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


    1. Connect an oscilloscope to terminals A38-21 (STA), A38-23 (STA2) and A38-6 (DGND).

      B0059YTC50
      *a

      Component with harness connected

      (Engine Stop and Start ECU)

      		 - -
    2. B0057H0E09
      *1 (ST 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

      A38-21 (STA) - A38-6 (DGND)

      A38-23 (STA2) - A38-6 (DGND)
      Condition Engine started by engine switch operation
      Result
      Result Proceed to
      Delay between ST relay turning on and ST NO. 2 relay turning on: between 0.03 and 0.06 seconds A
      Delay between ST relay turning on and ST NO. 2 relay turning on: not between 0.03 and 0.06 seconds B
      ST relay turns on and ST NO. 2 relay does not turn on C
      ST 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 STARTER INRUSH CURRENT REDUCTION RELAY for 8AR-FTS: Click here for 3ZR-FAE: 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, ST NO. 2 RELAY)


    1. Inspect the ST relay.


    2. Inspect the ST NO. 2 relay.


      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (ST, ST NO. 2 RELAY)

    OK

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

    B005AA6C03
    *1 No. 1 Engine Room Relay Block and Junction Block *2 No. 2 Engine Room Relay Block and Junction Block
    *a ST Relay Terminal *b ST NO. 2 Relay Terminal

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

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ST 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, ST NO. 2 RELAY - STARTER ASSEMBLY)


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

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

    3. Disconnect the C4 starter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ST relay terminal 3 - C4-2 (SL1) Always Below 1 Ω
      ST NO. 2 relay terminal 3 - C4-1 (SL2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the ST relay from No. 1 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 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 No. 2 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. 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 RELAY)


    1. Disconnect the A38 engine stop and start ECU connector.

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

    3. Disconnect the I51 certification ECU (smart key ECU assembly) connector.

    4. Disconnect the C14 park/neutral position switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A38-21 (STA) - ST relay terminal 2 Always Below 1 Ω
      A38-21 (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

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


    1. Disconnect the A38 engine stop and start ECU connector.

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

    3. Disconnect the A35 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A38-23 (STA2) - ST NO. 2 relay terminal 2 Always Below 1 Ω
      A38-23 (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. Connect the positive (+) lead of an oscilloscope to the positive (+) battery terminal and the negative (-) lead to the negative (-) battery terminal.

    2. While cranking the engine, count the number of times the waveform drops.

      B005A73E02
      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. B0058X8C02
      *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. B0057FAC02
      *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 for 8AR-FTS: Click here for 3ZR-FAE: 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. B0059OCC02
      *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 for 8AR-FTS: Click here for 3ZR-FAE: Click here

    NG

    REPLACE STARTER ASSEMBLY for 8AR-FTS: Click here for 3ZR-FAE: Click here

  23. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly.


      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPLACE STARTER ASSEMBLY for 8AR-FTS: Click here for 3ZR-FAE: Click here

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


    1. Disconnect the A73, A38 and I57 engine stop and start ECU connectors.

      B0058Z3C28
      *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
      A73-1 (BIN2) - Body ground Always 9.5 to 14 V
      A73-3 (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
      A38-1 (+B) - Body ground Engine switch on (IG) 9.5 to 14 V
      I57-18 (IG2) - Body ground Engine switch on (IG) 9.5 to 14 V
      I57-21 (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 A73 and A38 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
      A73-2 (GND2) - Body ground Always Below 1 Ω
      A73-8 (GND1) - Body ground Always Below 1 Ω
      A38-6 (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