Dtc P0571 Brake Switch A Circuit

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
Cruise Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

INSPECT STOP LIGHT SWITCH

CHECK HARNESS AND CONNECTOR (BATTERY - STOP LIGHT SWITCH)

CHECK ENGINE TYPE

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

DTC P0571 Brake Switch "A" Circuit


DESCRIPTION

When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is applied to terminal STP of the ECM through the STOP fuse and the stop light switch, and the ECM turns the cruise control off.

DTC Code
DTC Detection Condition
Trouble Area
P0571
When the voltage of the STP terminal and the ST1- terminal of the ECM is below than 1 V for 0.5 second. or more.
  1. Stop light switch
  2. Stop light switch circuit
  3. ECM

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Cruise Control.Cruise Control System. Dtc P0571 Brake Switch A Circuit


INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Using the intelligent tester, read the Data List (Click here).

    Cruise Control
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Stop Light SW M-CPU
    		Stop light switch signal (Main CPU) / ON or OFF
    		ON: Brake pedal depressed
    OFF: Brake pedal released
    		-
    OK:
    Normal conditions listed above are displayed.
    Result
    Result
    		Proceed to
    OK
    (for 1GR-FE)
    		A
    OK
    (for 1UR-FE)
    		B
    OK
    (for 3UR-FE)
    		C
    OK
    (for 1VD-FTV)
    		D
    NG
    		E


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)

E
Go to step 2
A

REPLACE ECM (Click here)

2.INSPECT STOP LIGHT SWITCH
Land Cruiser. Urj200, 202 Grj200 Vdj200.Cruise Control.Cruise Control System. Dtc P0571 Brake Switch A Circuit

  1. Remove the stop light switch (Click here).

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		Pin pushed
    		10 kΩ or higher
    Pin not pushed
    		Below 1 Ω
    3 - 4
    		Pin pushed
    		Below 1 Ω
    Pin not pushed
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for LHD)
    		B
    NG (for RHD)
    		C


B
REPLACE STOP LIGHT SWITCH (Click here)

C
REPLACE STOP LIGHT SWITCH (Click here)
A


3.CHECK HARNESS AND CONNECTOR (BATTERY - STOP LIGHT SWITCH)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Cruise Control.Cruise Control System. Dtc P0571 Brake Switch A Circuit

  1. Disconnect the A30 stop light switch connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A30-2 - Body ground
    		Always
    		11 to 14 V
    A30-4 - Body ground
    		Ignition switch ON


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK ENGINE TYPE

  1. Check the engine type.

    Engine Type
    Engine type
    		Proceed to
    for 1GR-FE, 1UR-FE, 3UR-FE, 1VD-FTV (w/o DPF)
    		A
    for 1VD-FTV (w/ DPF)
    		B


B
Go to step 6
A


5.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Cruise Control.Cruise Control System. Dtc P0571 Brake Switch A Circuit

  1. Disconnect the A30 stop light switch connector.

  1. Disconnect the A38*1 or A52*2 ECM connector.

    HINT:
    1. *1: for LHD
    2. *2: for RHD

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    A30-1 - A38-36 (STP)
    		Always
    		Below 1 Ω
    A30-1 - Body ground
    		Always
    		10 kΩ or higher
    A30-3 - A38-35 (ST1-)
    		Always
    		Below 1 Ω
    A30-3 - Body ground
    		Always
    		10 kΩ or higher
    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    A30-1 - A52-36 (STP)
    		Always
    		Below 1 Ω
    A30-1 - Body ground
    		Always
    		10 kΩ or higher
    A30-3 - A52-35 (ST1-)
    		Always
    		Below 1 Ω
    A30-3 - Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    OK
    (for 1GR-FE)
    		A
    OK
    (for 1UR-FE)
    		B
    OK
    (for 3UR-FE)
    		C
    OK
    (for 1VD-FTV, w/o DPF)
    		D
    NG
    		E


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)

E
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE ECM (Click here)

6.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Cruise Control.Cruise Control System. Dtc P0571 Brake Switch A Circuit

  1. Disconnect the A30 stop light switch connector.

  1. Disconnect the A38*1 or A52*2 ECM connector.

    HINT:
    1. *1: for LHD
    2. *2: for RHD

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    A30-1 - A38-13 (STP)
    		Always
    		Below 1 Ω
    A30-1 - Body ground
    		Always
    		10 kΩ or higher
    A30-3 - A38-35 (ST1-)
    		Always
    		Below 1 Ω
    A30-3 - Body ground
    		Always
    		10 kΩ or higher
    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    A30-1 - A52-13 (STP)
    		Always
    		Below 1 Ω
    A30-1 - Body ground
    		Always
    		10 kΩ or higher
    A30-3 - A52-35 (ST1-)
    		Always
    		Below 1 Ω
    A30-3 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)