Pre-Collision System

PRE-COLLISION: PRE-COLLISION SYSTEM: C1A41: Brake Request Value Mismatch between ENG / EHV and Driving Support ECU
C1A41 - Brake Request Value Mismatch between ENG / EHV and Driving Support ECU

DESCRIPTION

The skid control ECU receives brake control request signals from the hybrid vehicle control ECU and driving support ECU.

When the request signals received from the hybrid vehicle control ECU and driving support ECU are not consistent, the skid control ECU determines that a malfunction has occurred and sends a malfunction signal to the driving support ECU.

If the driving support ECU receives a malfunction signal, DTC C1A41 is output. Although the skid control ECU sends a malfunction signal to the driving support ECU, the ABS does not output a relevant malfunction detection DTC.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

Electronically controlled brake system DTC is not output.

NG -- GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM How To Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK FOR DTC (HYBRID CONTROL SYSTEM)

(a) Check for DTCs Hybrid Control System.

Result





B -- GO TO HYBRID CONTROL SYSTEM Hybrid Control System
A -- Continue to next step.

3. REPLACE HYBRID VEHICLE CONTROL ECU

(a) Replace the hybrid vehicle control ECU Removal.

NEXT -- Continue to next step.

4. CHECK FOR DTC

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code.

(b) Select "Clear" and clear the data.

(c) Recheck for DTC.

OK:

DTC C1A41 is not output.

NG -- REPLACE SKID CONTROL ECU

OK -- END

5. REPLACE SKID CONTROL ECU

(a) Replace the skid control ECU Removal.

NEXT -- Continue to next step.

6. CHECK FOR DTC

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code.

(b) Select "Clear" and clear the data.

(c) Recheck for DTC.

OK:

DTC C1A41 is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- END