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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 258 (Automatic Transaxle System (K120) - Diagnostic Codes (1 Of 5)) >> K120 Continuously Variable Transaxle System >> DTC P0615-12: Starter Relay Circuit Short to Battery [06/2018 - 01/2019] >> Procedure

DTC P0615-12: Starter Relay Circuit Short to Battery [06/2018 - 01/2019]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. READ VALUE USING TECHSTREAM (STARTER SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Transmission / Data List / Starter SW.

      Powertrain > Transmission > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Starter SW Starter signal OFF or ON
      • ON: Starter operating
      • OFF: Starter not operating
      		 -

      Powertrain > Transmission > Data List 

      Tester Display
      Starter SW
    5. According to the display on the Techstream, read the Data List.

      Standard

      Condition Starter SW
      Engine switch on (IG) OFF
    6. According to the display on the Techstream, 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 mph) or more.

      Standard

      Condition Starter SW
      Driving at 20 km/h (12 mph) or more (engine speed 1000 rpm or more) OFF

      OK

      On the Techstream screen, ON or OFF is displayed accordingly.

      HINT: 

      If the result of either of the above is not as specified, proceed to the next step with the engine switch on (IG), the Techstream connected and Data List item "Starter SW" selected.

      Result

      Proceed to
      OK
      NG

      HINT: 

      If the starter assembly operates continuously when the engine switch is turned on (IG), proceed to the next step without reading the Data List item "Starter SW".

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [06/2018 - 09/2024] 

    Result: 

    NG 

    See step  2

  2. INSPECT ST RELAY (CHECK FOR SHORT CIRCUIT) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Transmission / Data List / Starter SW.
    5. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    6. According to the display on the Techstream, read the Data List.

      Powertrain > Transmission > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Starter SW Starter signal OFF or ON
      • ON: Starter operating
      • OFF: Starter not operating
      		 -

      Powertrain > Transmission > Data List 

      Tester Display
      Starter SW

      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 Techstream.

    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.
      GTY915981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay Holder
    2. Turn the engine switch on (IG).
    3. Measure the voltage between ST relay terminal 1 and body ground.

      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 engine switch on (IG) and do not install the ST relay.
      • DTCs may be stored during this inspection. Check for DTCs and clear them using the Techstream.
      • If any voltage was measured with the engine switch on (IG), one of the following malfunctions is suspected:
        • Short to +B in the circuit of a connected ECU or park/neutral position switch assembly.
        • Short to +B in the wire harness.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY (CHECK FOR SHORT CIRCUIT) 
    1. Disconnect the C62 park/neutral position switch assembly connector.
      GTY915981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay Holder
    2. Measure the voltage between ST relay terminal 1 and body ground and compare it to the voltage measured in the previous step.

      Result

      Result Proceed to
      The voltage between ST relay terminal 1 and body ground does not change when the connector is disconnected. A
      The voltage between ST relay terminal 1 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 Techstream.

    Result: 

    B 

    REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to  COMPONENTS [06/2018 - 06/2021] 

    Result: 

    A 

    See step  5

  5. INSPECT ECM (CHECK FOR SHORT CIRCUIT) 
    1. Disconnect the A47 ECM connector.
      GTY915981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay Holder
    2. Measure the voltage between ST relay terminal 1 and body ground and compare it to the voltage measured in the previous step.

      Result

      Result Proceed to
      The voltage between ST relay terminal 1 and body ground does not change when the connector is disconnected. A
      The voltage between ST relay terminal 1 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 Techstream.

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  6

  6. INSPECT TCM (CHECK FOR SHORT CIRCUIT) 
    1. Disconnect the C80 TCM connector.
      GTY915981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 ST Relay Holder
    2. Measure the voltage between ST relay terminal 1 and body ground and compare it to the voltage measured in the previous step.

      Result

      Result Proceed to
      The voltage between ST relay terminal 1 and body ground does not change when the connector is disconnected. A
      The voltage between ST relay terminal 1 and body ground changes when the connector is disconnected. B

      HINT: 

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

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (TCM - ECM - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - SMART KEY ECU ASSEMBLY - ST RELAY) 
    1. Disconnect the C80 TCM connector.
    2. Disconnect the A47 ECM connector.
    3. Disconnect the C62 park/neutral position switch assembly connector.
    4. Disconnect the O62 certification ECU (smart key ECU assembly) connector.
    5. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C80-28 (STA), A47-30 (STA), C62-5 (L), O62-1 (STA) or 1 (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 CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)). Refer to  TERMINALS OF ECU [06/2018 - 01/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. REPLACE TCM 
    1. Replace the TCM.

      Refer to COMPONENTS [06/2018 - 01/2019]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM REGISTRATION AND INITIALIZATION 

    for Registration: Refer to REGISTRATION [06/2018 - 09/2024]

    for Initialization: Refer to INITIALIZATION [06/2018 - 09/2022]

  9. REPLACE ECM 
    1. Replace the ECM.

      Refer to COMPONENTS [06/2018 - 09/2022]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    PERFORM INITIALIZATION. Refer to  INITIALIZATION [06/2018 - 09/2022] 

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