Dtc P0504 Brake Switch A / B Correlation

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
1Ur-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (STOP LIGHT SWITCH)

CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)

CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND)

CHECK TERMINAL VOLTAGE (STP AND ST1- VOLTAGE)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NO. 2 INTEGRATION RELAY)

DTC P0504 Brake Switch "A" / "B" Correlation


DESCRIPTION

The stop light switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the ECM to monitor whether or not the brake system is working properly. If the signals, which indicate the brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a malfunction in the stop light switch and stores the DTC.

HINT:
The normal conditions are as shown in the table below.

Signal (ECM Terminal)
Brake Pedal Released
In Transition
Brake Pedal Depressed
STP
OFF
ON
ON
ST1-
ON
ON
OFF
  1. [OFF] denotes ground potential.
  2. [ON] denotes battery potential (+B).
  3. On the GTS, both the Data List items Stop Light Switch and ST1 are ON when the brake pedal is depressed because the ST1 indication characteristic is opposite to the Stop Light Switch indication.

DTC No.
DTC Detection Condition
Trouble Area
P0504
Conditions (a), (b) and (c) continue for 0.5 seconds or more (1 trip detection logic):
(a) The engine switch is on (IG).
(b) The STP signal is OFF when the ST1- signal is OFF.
  1. Short in stop light switch signal circuit
  2. Stop light switch
  3. ECM

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.1Ur-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
  1. Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
  2. Stop light switch conditions can be checked using the GTS.
    1. Connect the GTS to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the GTS on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Stop Light Switch and ST1.
    5. Check the Data List indication when the brake pedal is depressed and released.

Brake Pedal Operation
Stop Light Switch
ST1
Depressed
ON
ON
Released
OFF
OFF
1.READ VALUE USING GTS (STOP LIGHT SWITCH)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch.

  1. Read the value displayed on the GTS.

    OK:

    Tester Display
    		Measurement Item/Range (display)
    		Normal Condition
    Stop Light Switch
    		Stop light switch status: ON or OFF
    		ON: Brake pedal depressed
    OFF: Brake pedal released


NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (Click here)

2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)
Land Cruiser. Urj200, 202 Grj200 Vdj200.1Ur-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the stop light switch assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A73-1 (B) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)
OK


3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)
Land Cruiser. Urj200, 202 Grj200 Vdj200.1Ur-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the stop light switch assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A73-5 (B) - Body ground
    		Engine switch on (IG)
    		11 to 14 V


NG
Go to step 7
OK


4.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BODY GROUND)

  1. Disconnect the stop light switch assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A73-3 (GND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK TERMINAL VOLTAGE (STP AND ST1- VOLTAGE)

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Ur-Fe Engine Control.Sfi System. Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the ECM connector.

  1. Turn the engine switch on (IG).

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

    Standard Voltage (for RHD):

    Tester Connection
    		Brake Pedal Operation
    		Specified Condition
    A52-35 (ST1-) - Body ground
    		Released
    		7.5 to 14 V
    Depressed
    		Below 1.5 V
    A52-36 (STP) - Body ground
    		Released
    		Below 1.5 V
    Depressed
    		7.5 to 14 V

    Standard Voltage (for LHD):

    Tester Connection
    		Brake Pedal Operation
    		Specified Condition
    A38-35 (ST1-) - Body ground
    		Released
    		7.5 to 14 V
    Depressed
    		Below 1.5 V
    A38-36 (STP) - Body ground
    		Released
    		Below 1.5 V
    Depressed
    		7.5 to 14 V


NG
Go to step 6
OK

REPLACE ECM (Click here)

6.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

  1. Disconnect the stop light switch assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (for RHD):

    Tester Connection
    		Brake Pedal Operation
    		Specified Condition
    A73-4 (L) - A52-35 (ST1-)
    		Always
    		Below 1 Ω
    A73-2 (L) - A52-36 (STP)
    		Always
    		Below 1 Ω
    A73-4 (L) or A52-35 (ST1-) - Body ground
    		Always
    		10 kΩ or higher
    A73-2 (L) or A52-36 (STP) - Body ground
    		Always
    		10 kΩ or higher

    Standard Resistance (for LHD):

    Tester Connection
    		Brake Pedal Operation
    		Specified Condition
    A73-4 (L) - A38-35 (ST1-)
    		Always
    		Below 1 Ω
    A73-2 (L) - A38-36 (STP)
    		Always
    		Below 1 Ω
    A73-4 (L) or A38-35 (ST1-) - Body ground
    		Always
    		10 kΩ or higher
    A73-2 (L) or A38-36 (STP) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)

7.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - NO. 2 INTEGRATION RELAY)

  1. Disconnect the stop light switch assembly connector.

  1. Disconnect the No. 2 integration relay connector.

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

    Standard Resistance:

    Tester Connection
    		Brake Pedal Operation
    		Specified Condition
    A73-5 (B) - 1R-1
    		Always
    		Below 1 Ω
    A73-5 (B) or 1R-1 - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE NO. 2 INTEGRATION RELAY