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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Starter >> Stop And Start System - Diagnostic Codes (3 Of 3) & Circuit Tests (1 Of 3) >> Stop And Start System >> Starter Signal Circuit [12/2019 - 10/2022] >> Procedure

Starter Signal Circuit [12/2019 - 10/2022]: Procedure

  1. CHECK CRANKING 
    1. Engine start and check that the engine cranks.

      Result

      Result Proceed to
      Engine cranks A
      Engine does not crank B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS (STARTER (HOOD CLOSE)) 
    1. Check that the engine hood is closed.
    2. Check whether the engine cranks while the Active Test "Starter (Hood Close)" is being performed.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Starter (Hood Close)
      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

    Result: 

    OK 

    GO TO DTC P1603-00 (CONFIRM CAUSE OF ENGINE STALL). Refer to  DTC P1603-00: Engine Stall History [12/2019 - 10/2022] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BIN1 AND BIN2 TERMINALS POWER SOURCE CIRCUIT) 
    GTY873587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Engine Stop and Start ECU)
    1. 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
      A33-1 (BIN2) - Body ground Always 9.5 to 14 V
      A33-3 (BIN1) - Body ground Always 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - BATTERY) 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL POWER SOURCE CIRCUIT) 
    GTY897206Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Engine Stop and Start ECU)
    1. Disconnect the engine stop and start ECU connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H66-21 (IG1) - Body ground Ignition switch ON 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1-NO. 1 RELAY)) 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (+B AND IG2 TERMINALS POWER SOURCE CIRCUIT) 
    GTY929097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Engine Stop and Start ECU)    		 - -
    1. Disconnect the engine stop and start ECU connectors.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A34-1 (+B) - Body ground Ignition switch ON 9.5 to 14 V
      H66-18 (IG2) - Body ground Ignition switch ON 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - EFI-MAIN NO. 1 RELAY OR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG2-NO. 2 RELAY)) 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND) 
    1. Disconnect the 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
      A33-2 (GND2) - Body ground Always Below 1 Ω
      A33-8 (GND1) - Body ground Always Below 1 Ω
      A34-6 (DGND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. PERFORM ACTIVE TEST USING GTS (STARTER (HOOD CLOSE)) 
    1. Check that the engine hood is closed.
    2. Check whether the engine cranks while the Active Test "Starter (Hood Close)" is being performed.

      Powertrain > Stop and Start > Active Test 

      Tester Display
      Starter (Hood Close)
      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

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  8

  8. READ VALUE USING GTS (NEUTRAL SWITCH) 
    1. In accordance with the display on the GTS, read the Data List.

      Powertrain > Stop and Start > Data List 

      Tester Display
      Neutral Switch

      OK

      GTS 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

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Disconnect the engine stop and start ECU connector.
    4. Disconnect the ECM connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A19-9 (STAR) - C52-4 (B) Always Below 1 Ω
      A19-9 (STAR) or C52-4 (B) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (STAR SIGNAL) 
    1. Disconnect the engine stop and start ECU connector.
      GTY897062Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *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
      A34-17 (CLL) - Body ground Engine start 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - ] 

    Result: 

    NG 

    GO TO SMART ENTRY AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 11/2023] 

  11. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. for 2WD Models:

      Refer to INSPECTION [12/2019 - 10/2022]

    2. for AWD Models:

      Refer to INSPECTION [12/2019 - 10/2022]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    1. for 2WD Models:

      Refer to REMOVAL [12/2019 - 10/2022]

    2. for AWD Models:

      Refer to REMOVAL [12/2019 - 10/2022]

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ST RELAY) 
    1. Disconnect the certification ECU (smart key ECU assembly) connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the engine stop and start ECU connector.
    4. Disconnect the ECM connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A19-9 (STAR) - 2 (ST relay) Shift lever in P or N Below 1 Ω
      Shift lever not in P or N 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. INSPECT RELAY (ST RELAY) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE RELAY (ST RELAY) 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (ST RELAY - BATTERY) 
    GTY891392Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
    *2 ST Relay
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      5 (ST relay) - Body ground Always 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BATTERY) 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 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
      3 (ST relay) - C56-1 (ST) Always Below 1 Ω
      3 (ST relay) - C58-1 (ZYV) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - STARTER ASSEMBLY) 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND) 
    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (ST relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BODY GROUND) 

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ST RELAY) 
    1. Disconnect the engine stop and start ECU connector.
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the certification ECU (smart key ECU assembly) connector.
    4. Disconnect the park/neutral position switch assembly connector.
    5. Disconnect the ECM connector.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A34-21 (STA) - 2 (ST relay) Always Below 1 Ω
      A34-21 (STA) or 2 (ST relay) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  18

  18. 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.
      GTY714735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard

      Waveform drops 2 times

      Result

      Number of Times Waveform Dropped Proceed to
      0 times A
      2 times B

    Result: 

    B 

    See step  22

    Result: 

    A 

    See step  19

  19. INSPECT STARTER INRUSH CURRENT REDUCTION RELAY 
    GTY894289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Starter Assembly
    *a B Terminal
    *b M Terminal
    1. 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

    Result: 

    NG 

    See step  21

    Result: 

    OK 

    See step  20

  20. INSPECT STARTER ASSEMBLY (WIRE HARNESS) 
    GTY894619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Starter Assembly
    *a Inspect Part
    *b B Terminal
    *c C Terminal
    1. Disconnect the cable from the negative (-) battery terminal.
    2. 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

    Result: 

    OK 

    REPLACE STARTER ASSEMBLY. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE WIRE HARNESS 

  21. INSPECT STARTER ASSEMBLY (M TERMINAL) 
    GTY898578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Starter Assembly
    *a Inspect Part
    *b M Terminal
    1. Disconnect the cable from the negative (-) battery terminal.
    2. 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

    Result: 

    OK 

    REPLACE STARTER INRUSH CURRENT REDUCTION RELAY. Refer to  PROCEDURE - Step 2 

    Result: 

    NG 

    REPLACE STARTER ASSEMBLY. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

  22. INSPECT STARTER ASSEMBLY 

    Refer to INSPECTION [12/2019 - 10/2022]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - ] 

    Result: 

    NG 

    REPLACE STARTER ASSEMBLY. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

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