DTC    C1A41    Brake Request Value Mismatch between ENG / EHV and Driving Support ECU

for Preparation Click here


DESCRIPTION

The brake booster with master cylinder (skid control ECU) receives brake control request signals from the power management control ECU and driving support ECU assembly.
When the request signals received from the power management control ECU and driving support ECU assembly are not consistent, the brake booster with master cylinder (skid control ECU) determines that a malfunction has occurred and sends a malfunction signal to the driving support ECU assembly.

DTC No.
DTC Detection Condition
Trouble Area
C1A41
While power switch is on (IG), brake request signal from power management control ECU and driving support ECU assembly are inconsistent for 1 second
  1. Electronically controlled brake system
  2. Hybrid control system
  3. Power management control ECU
  4. Brake booster with master cylinder (skid control ECU)
  5. Driving support ECU assembly

WIRING DIAGRAM

Refer to DTC C1A50 (Click here).

INSPECTION PROCEDURE

1.READ OUTPUT DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B



B
GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (Click here)
A


2.READ OUTPUT DTC (HYBRID CONTROL SYSTEM)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Powertrain / Hybrid Control / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B



B
GO TO HYBRID CONTROL SYSTEM (Click here)
A


3.CHECK WHETHER DTC OUTPUT RECURS (DTC C1A41)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the malfunction cannot be detected.

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC C1A41 is output
    		B



B
Go to step 4
A

USE SIMULATION METHOD TO CHECK (Click here)  

4.REPLACE DRIVING SUPPORT ECU ASSEMBLY

  1. Replace the driving support ECU assembly (Click here).


NEXT


5.CHECK WHETHER DTC OUTPUT RECURS (DTC C1A41)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the malfunction cannot be detected.

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC C1A41 is output
    		B



B
Go to step 6
A

END 

6.REPLACE BRAKE BOOSTER WITH MASTER CYLINDER

  1. Replace the brake booster with master cylinder (skid control ECU) (Click herefor LHD, Click here for RHD).


NEXT


7.CHECK WHETHER DTC OUTPUT RECURS (DTC C1A41)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the malfunction cannot be detected.

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the DTCs.

    Result:
    Result
    		Proceed to
    DTC is not output
    		A
    DTC C1A41 is output
    		B



B
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
A

END