DTC P1578 Brake System Malfunction

DESCRIPTION

This DTC may also be stored when there is a vehicle stability control system malfunction.

DTC Code	DTC Detection Condition	Trouble Area
P1578	During cruise control operation (vehicle-to-vehicle distance control mode), the brake system malfunctions.	Vehicle stability control system ECM

This DTC code may be output under the vehicle stability control system at the same time. In that case, perform troubleshooting for the vehicle stability control system first.

1.CHECK DTC (VEHICLE STABILITY CONTROL SYSTEM)

Using the intelligent tester, enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Code.

Check for DTCs ().

NG

GO TO VEHICLE STABILITY CONTROL SYSTEM ()

OK

2.CHECK DTC (DYNAMIC RADAR CRUISE CONTROL SYSTEM)

Using the intelligent tester, enter the following menus: Powertrain / Radar Cruise / Trouble Code.

Clear the DTCs ().

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

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

Drive the vehicle at a speed of 50 km/h (30 mph) or more.

Turn the cruise control main switch on.

Push the -SET switch to activate the dynamic radar cruise control.

Check for DTCs ().

B

REPLACE ECM ()

C

REPLACE ECM ()

A

USE SIMULATION METHOD TO CHECK ()