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DTC P0615-12: Starter Relay Circuit Short to Battery [09/2024 - ]: Procedure

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  1. READ VALUE USING GTS (STARTER SW) 
    1. Enter the following menus.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    2. According to the display on the GTS, read the Data List.

      Standard

      Condition Starter SW
      Ignition switch ON OFF
    3. According to the display on the GTS, read the Data List while the vehicle is being driven with an engine speed of 1000 RPM or more at a vehicle speed of 20 km/h (12.43 mph) or more.
      WARNING:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      Standard

      Condition Starter SW
      Driving at 20 km/h (12.43 mph) or more (engine speed 1000 RPM or more) OFF

      HINT: 

      If the result of either of the above is not as specified, proceed to the next step with the ignition switch to ON, GTS connected and Data List item "Starter SW" selected.

      Result

      Result Proceed to
      OK A
      NG B

      HINT: 

      If the starter assembly operates continuously when the ignition switch is turned to ON, proceed to the next step without reading the Data List item "Starter SW".

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2022 - ]

    Result: 

    B 

    See step  2

  2. INSPECT ST RELAY (CHECK FOR SHORT CIRCUIT) 
    1. Enter the following menus.

      Powertrain > Engine > Data List 

      Tester Display
      Starter SW
    2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. According to the display on the GTS, read the Data List.

      Result

      Result Proceed to
      The Data List item "Starter SW" does not change from ON A
      The Data List item "Starter SW" changes from ON to OFF B

      HINT: 

      • When the result of the above inspection is "The Data List item "Starter SW" does not change from ON", the ST relay is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Result: 

    B 

    REPLACE ST RELAY 

    Result: 

    A 

    See step  3

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ST RELAY) 

    HINT: 

    The purpose of this step is to check for ST relay terminal voltage under abnormal conditions.

    1. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between ST relay terminal 2 and body ground.
      GTY1251331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay

      HINT: 

      • Make a note of the measured voltage as it will be necessary for the inspecting the change in voltage in the next step. As the next step should be conducted under the same conditions, keep the ignition switch to ON and do not install the ST relay.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.
      • If any voltage was measured with the ignition switch to ON, one of the following malfunctions is suspected:
        • Short to +B in the circuit of a connected ECU or the switch.
        • Short to +B in the wire harness.

      Result

      Result Proceed to
      for M/T Models A
      for A/T Models B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  4

  4. INSPECT CLUTCH START SWITCH ASSEMBLY (CHECK FOR SHORT CIRCUIT) 
    1. Disconnect the clutch start switch assembly connector.
    2. Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.
      GTY1251331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay

      Result

      Result Proceed to
      The voltage between ST relay terminal 2 and body ground does not change when the connector is disconnected. A
      The voltage between ST relay terminal 2 and body ground changes when the connector is disconnected. B

      HINT: 

      • If the voltage is the same before and after disconnecting the connector, the clutch pedal switch assembly is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Result: 

    B 

    REPLACE CLUTCH START SWITCH ASSEMBLY 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    A 

    See step  5

  5. INSPECT ECM (CHECK FOR SHORT CIRCUIT) 
    1. Disconnect the ECM connector.
    2. Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.
      GTY1251331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay

      Result

      Result Proceed to
      The voltage between ST relay terminal 2 and body ground does not change when the connector is disconnected. A
      The voltage between ST relay terminal 2 and body ground changes when the connector is disconnected. B

      HINT: 

      • If the voltage is the same before and after disconnecting the connector, the ECM is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [09/2024 - ]

    Result: 

    A 

    See step  6

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A139-30 (STA), A177-1, O175-3 (STA) or 2 (ST relay) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK SMART KEY SYSTEM (CHECK FOR STA TERMINAL VOLTAGE OF SMART KEY ECU ASSEMBLY) 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY (CHECK FOR SHORT CIRCUIT) 
    1. Disconnect the park/neutral position switch assembly connector.
    2. Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.
      GTY1251331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay

      Result

      Result Proceed to
      The voltage between ST relay terminal 2 and body ground does not change when the connector is disconnected. A
      The voltage between ST relay terminal 2 and body ground changes when the connector is disconnected. B

      HINT: 

      • If the voltage is the same before and after disconnecting the connector, the park/neutral position switch assembly is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Result: 

    B 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 

    Refer to REMOVAL [09/2024 - ]

    Result: 

    A 

    See step  8

  8. INSPECT ECM (CHECK FOR SHORT CIRCUIT) 
    1. Disconnect the ECM connector.
    2. Measure the voltage between ST relay terminal 2 and body ground and compare it to the voltage measured in the previous step.
      GTY1251331Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay

      Result

      Result Proceed to
      The voltage between ST relay terminal 2 and body ground does not change when the connector is disconnected. A
      The voltage between ST relay terminal 2 and body ground changes when the connector is disconnected. B

      HINT: 

      • If the voltage is the same before and after disconnecting the connector, the ECM is normal.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [09/2024 - ]

    Result: 

    A 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - CERTIFICATION ECU - ST RELAY) 
    1. Disconnect the ECM connector.
    2. Disconnect the park/neutral position switch assembly connector.
    3. Disconnect the certification ECU (smart key ECU assembly) connector.
    4. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A139-30 (STA), C162-9 (L), O175-3 (STA) or 2 (ST relay) - Other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK SMART KEY SYSTEM (CHECK FOR STA TERMINAL VOLTAGE OF SMART KEY ECU ASSEMBLY) 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2022 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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