DTC P1578: Brake System Malfunction: Procedure

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 the DTC.

   Result

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

B → See step   5 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. 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 for which cruise control operation is possible.
   2. Turn the cruise control system on using the ON-OFF switch.
   3. Push the -/SET switch to activate the cruise control.
5. Enter the following menus: Powertrain / Cruise Control / Trouble Codes.
6. Check for DTCs.

   Result

   Result	Proceed to
   DTC is not output	A
   DTC P1578 is output	B

B → See step   3 

A → See step   6 

Replace the brake booster with master cylinder assembly (skid control ECU). Refer to REMOVAL .

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. 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 for which cruise control operation is possible.
   2. Turn the cruise control system on using the ON-OFF switch.
   3. Push the -/SET switch to activate the cruise control.
6. Enter the following menus: Powertrain / Cruise Control / Trouble Codes.
7. Check for DTCs.

   Result

   Result	Proceed to
   DTC is not output	A
   DTC P1578 is output	B

B → See step   7 

A → END