P1578

CRUISE CONTROL: CRUISE CONTROL SYSTEM: P1578: Brake System Malfunction
P1578 - Brake System Malfunction

DESCRIPTION

This DTC is output when the electronically controlled brake system has a problem. Check the electronically controlled brake system when this DTC is output.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this problem.

PROCEDURE

1. CHECK FOR DTC (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

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

Result:





B -- GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Electronically Controlled Brake System
A -- Continue to next step.

2. CHECK FOR DTC (CRUISE CONTROL SYSTEM)

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) 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 40 km/h (25 mph) or more.

(2) Turn the cruise control main switch on.

(3) Push the -SET switch to activate the cruise control.

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

Result:





B -- REPLACE SKID CONTROL ECU

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. REPLACE SKID CONTROL ECU

(a) Replace the skid control ECU Removal.

NEXT -- Continue to next step.

4. CHECK FOR DTC (CRUISE CONTROL SYSTEM)

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) 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 40 km/h (25 mph) or more.

(2) Turn the cruise control main switch on.

(3) Push the -SET switch to activate the cruise control.

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

Result:





B -- REPLACE HYBRID VEHICLE CONTROL ECU Removal

A -- END (SKID CONTROL ECU IS DEFECTIVE)