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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> Restraints >> Seat Belts >> Pre-Collision System - Diagnostic Codes & Circuit Tests - (Hybrid) >> Pre-Collision System >> DTC C1A41: Brake Request Value Mismatch between ENG / EHV and Driving Support ECU [02/2014 - 11/2016] >> Procedure

DTC C1A41: Brake Request Value Mismatch between ENG / EHV and Driving Support ECU [02/2014 - 11/2016]: Procedure

  1. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
    5. Check for DTCs.

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      Electronically controlled brake system DTCs are not output A
      Electronically controlled brake system DTCs are output B
    6. Turn the power switch off.

    Result:  2

    B 

    GO TO DTC CHART (ELECTRONICALLY CONTROLLED BRAKE SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [02/2014 - 11/2016] 

    Result:  3

    A 

    See step  2

  2. CHECK FOR DTCs (HYBRID CONTROL SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    5. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - 11/2016]

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      Hybrid control system DTCs are not output A
      Hybrid control system DTCs are output B
    6. Turn the power switch off.

    Result:  2

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - ] 

    Result:  1

    A 

    See step  3

  3. REPLACE POWER MANAGEMENT CONTROL ECU 
    1. Replace the power management control ECU with a new one.

      Refer to REMOVAL [02/2014 - 11/2016]

    NEXT 

  4. CHECK FOR DTC (PRE-COLLISION 2) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - 11/2016]

    4. Make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the system cannot detect the malfunction.

    5. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    6. Check for DTCs.

      Body Electrical > Pre-Collision 2 > Trouble Codes 

      Result

      Result Proceed to
      DTC C1A41 is output A
      DTC C1A41 is not output B
    7. Turn the power switch off.

    Result:  2

    B 

    END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE) 

    Result:  1

    A 

    See step  5

  5. REPLACE SKID CONTROL ECU ASSEMBLY 
    1. Replace the skid control ECU assembly with a new one.

      Refer to REMOVAL [02/2014 - ]

    NEXT 

  6. CHECK FOR DTC (PRE-COLLISION 2) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2014 - 11/2016]

    4. Make sure that the DTC detection conditions are met.

      HINT: 

      If the detection conditions are not met, the system cannot detect the malfunction.

    5. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
    6. Check for DTCs.

      Body Electrical > Pre-Collision 2 > Trouble Codes 

      Result

      Result Proceed to
      DTC C1A41 is not output A
      DTC C1A41 is output B
    7. Turn the power switch off.

    Result:  1

    A 

    END (SKID CONTROL ECU ASSEMBLY WAS DEFECTIVE) 

    Result:  2

    B 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  COMPONENTS [02/2014 - ] 

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