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Home >> Lexus >> 2017 >> LS 460 Base, AWD >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Pre-Collision System (W/O Driver Monitor Camera) - Diagnostic Codes >> PRE-COLLISION SYSTEM(w/o Driver Monitor Camera) >> DTC C1A41: Brake Request Value Mismatch between ENG / EHV and Driving Support ECU [09/2015 - ] >> Procedure

DTC C1A41: Brake Request Value Mismatch between ENG / EHV and Driving Support ECU [09/2015 - ]: Procedure

  1. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) 
    1. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Code /
    2. Check for DTCs.

      OK

      Electronically controlled brake system DTC is not output.

    Result:  NG

    NG 

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2015 - ] )

    Result:  OK

    OK 

    See step  2

  2. CHECK FOR DTC (SFI SYSTEM) 
    1. Enter the following menus: Powertrain / Engine / Trouble Code /
    2. Check for DTCs.

      OK

      SFI system DTC is not output.

    Result:  NG

    NG 

    GO TO SFI SYSTEM 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2015 - 09/2016] Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2016 - ] )

    Result:  OK

    OK 

    See step  3

  3. REPLACE ECM 
    1. Replace the ECM (Refer to REMOVAL [09/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  4

  4. CHECK FOR DTC 
    1. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code /
    2. Select "Clear" and clear the data.
    3. Recheck for DTC.

      OK

      DTC C1A41 is not output.

    Result:  OK

    OK 

    END (ECM IS DEFECTIVE) 

    Result:  NG

    NG 

    See step  5

  5. REPLACE SKID CONTROL ECU ASSEMBLY 
    1. Replace the skid control ECU assembly (Refer to REMOVAL [09/2015 - ] ).

    Result:  NEXT

    NEXT 

    See step  6

  6. CHECK FOR DTC 
    1. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code /
    2. Select "Clear" and clear the data.
    3. Recheck for DTC.

      OK

      DTC C1A41 is not output.

    Result:  OK

    OK 

    END (SKID CONTROL ECU ASSEMBLY IS DEFECTIVE) 

    Result:  NG

    NG 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY 

    (Refer to REMOVAL [09/2015 - ] )