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Home >> Lexus >> 2024 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Electronic A/T Shift Lever System - Diagnostic Codes & Circuit Tests) >> Electronic Shift Lever System >> DTC P176D-12: IG2 Signal (Gear Shift Control Module "A") Circuit Short to Auxiliary Battery [11/2021 - ] >> Procedure

DTC P176D-12: IG2 Signal (Gear Shift Control Module "A") Circuit Short to Auxiliary Battery [11/2021 - ]: Procedure

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  1. CHECK TRANSMISSION FLOOR SHIFT ASSEMBLY (SHIFT CONTROL ECU) (IGP TERMINAL VOLTAGE) 

    Pre-procedure1

    1. Disconnect the D39 transmission floor shift assembly (shift control ECU) connector.

      Procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      D39-1 (IGP) - Body ground Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. Connect the transmission floor shift assembly (shift control ECU) connector.

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. CLEAR DTC 

    Pre-procedure1

    1. Turn the ignition switch to ON.

      Procedure1

    2. Clear the DTCs.

      Powertrain > Hybrid Control > Clear DTCs 

      Result

      Proceed to
      NEXT

      Post-procedure1

    3. Turn the ignition switch off.
    4. Disconnect the GTS.
    5. Leave the vehicle as is for 60 seconds or more.
      NOTE:
      • Do not connect the GTS.
      • Do not depress the brake pedal.
      • Do not open/close any of the doors.

    Result: 

    NEXT 

    See step  3

  3. CHECK DTC OUTPUT (PERFORM A REPRODUCTION TEST) 

    Pre-procedure1

    1. Turn the ignition switch to ON and wait for 1 minute or more.
    2. Turn the ignition switch to OFF and wait for 1 minute or more.
    3. Turn the ignition switch to ON.

      Procedure1

    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P176D-12 is not output A
      P176D-12 is output B

      Post-procedure1

    5. Turn the ignition switch off.

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE TRANSMISSION FLOOR SHIFT ASSEMBLY (SHIFT CONTROL ECU). Refer to  REMOVAL [11/2021 - ] 

  4. CHECK HARNESS AND CONNECTOR (SHIFT CONTROL ECU - IGP NO. 1 RELAY) 

    Pre-procedure1

    1. Disconnect the D39 transmission floor shift assembly (shift control ECU) connector.
    2. Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      Procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      D39-1 (IGP) - Body ground Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Install the IGP NO. 1 relay to the No. 1 engine room relay block and No. 1 junction block assembly.
    5. Connect the transmission floor shift assembly (shift control ECU) connector.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT RELAY (IGP NO. 1) 

    Pre-procedure1

    1. Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied between terminals 1 and 2 Below 1 Ω

      Result

      Proceed to
      OK
      NG
      GTY447534Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Post-procedure1

    3. Install the IGP NO. 1 relay to the No. 1 engine room relay block and No. 1 junction block assembly.

    Result: 

    NG 

    REPLACE RELAY (IGP NO. 1) 

    Result: 

    OK 

    See step  6

  6. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

    Pre-procedure1

    1. None

      Procedure1

    2. Measure the voltage according to the value(s) in the table below.
      Tester Connection Condition Specified Condition
      A10-24 (IGPD) - Body ground Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG
      GTY1080667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Certification ECU (Smart Key ECU Assembly))

      Post-procedure1

    3. None

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ]

    Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [11/2021 - ]

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (IGP NO. 1 RELAY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) 

    Pre-procedure1

    1. Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the A10 certification ECU (smart key ECU Assembly) connector.

      Procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      A10-24 (IGPD) - Body ground Ignition switch off Below 1 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Connect the certification ECU (smart key ECU Assembly) connector.
    5. Install the IGP NO. 1 relay to the No. 1 engine room relay block and No. 1 junction block assembly.

    Result: 

    OK 

    CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (START FUNCTION). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 03/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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