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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Electrical >> Starter >> Stop And Start System - Diagnostic Codes (1 Of 3) >> Stop And Start System >> DTC P0615-62: Starter Relay Signal Compare Failure [12/2019 - 10/2022] >> Procedure

DTC P0615-62: Starter Relay Signal Compare Failure [12/2019 - 10/2022]: Procedure

  1. READ VALUE USING GTS (ENGINE STARTER SIGNAL) 
    1. Read the values displayed on the GTS when the ignition switch ON and START.

      Powertrain > Stop and Start > Data List 

      Tester Display
      Engine Starter Signal

      OK

      GTS Display Condition Normal Condition
      Engine Starter Signal Ignition switch ON OFF
      Engine start ON

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. READ VALUE USING GTS (STARTER SW) 
    1. Read the values displayed on the GTS when the ignition switch ON and START.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW

      OK

      GTS Display Condition Normal Condition
      Starter SW Ignition switch ON OFF
      Engine start ON

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (ECM - ST RELAY) 
    1. Disconnect the ECM 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 certification ECU (smart key ECU assembly) connector.
    5. Disconnect the park/neutral position switch assembly connector.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A28-43 (STA) - 2 (ST relay) Always Below 1 Ω
      A28-43 (STA) or 2 (ST relay) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - ECM - ST RELAY) 
    1. Disconnect the engine stop and start ECU connector.
    2. Disconnect the ECM connector.
    3. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    4. Disconnect the certification ECU (smart key ECU assembly) connector.
    5. Disconnect the park/neutral position switch assembly 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) - A28-43 (STA) Always Below 1 Ω
      A34-21 (STA), A28-43 (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  5

  5. INSPECT RELAY (ST RELAY) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE RELAY (ST RELAY) 

    Result: 

    OK 

    See step  6

  6. 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: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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