Dtc P0504 Brake Switch A / B Correlation

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
1Vd-Ftv Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK ECM (STP AND ST1- VOLTAGE)

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

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 that 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 signal 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.

P0504
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
Depress and release brake pedal with engine switch on (IG)
Conditions (a), (b) and (c) continue for 0.5 seconds or more (1 trip detection logic):
(a) Engine switch on (IG).
(b) Brake pedal is released.
(c) The STP signal is off when the ST1- signal is off, or the STP signal is on when the ST1- signal is on.
  1. Open or short in stop light switch signal circuit
  2. STOP fuse
  3. IGN fuse
  4. Stop light switch
  5. ECM

Related Data List
DTC No.
Data List
P0504
Stop Light Switch

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.1Vd-Ftv Engine Control.Ecd System (W/ Dpf). Dtc P0504 Brake Switch A / B Correlation


INSPECTION 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, 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: Engine and ECT / Data List / Stop Light Switch.
    5. Check Stop Light Switch when the brake pedal is depressed and released.

Brake Pedal Operation
Specified Condition
Depressed
ON
Released
OFF
NOTICE:
  1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  2. After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
  3. After replacing the fuel supply pump assembly, the ECM needs initialization (Click here).
  4. After replacing an injector assembly, the ECM needs registration (Click here).
1.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.1Vd-Ftv Engine Control.Ecd System (W/ Dpf). Dtc P0504 Brake Switch A / B Correlation

  1. Disconnect the 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
    		Engine switch on (IG)
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Stop Light Switch)

  1. Reconnect the stop light switch connector.



NG
Go to step 6
OK


2.INSPECT STOP LIGHT SWITCH ASSEMBLY

  1. Inspect the stop light switch assembly (Click here).



NG
Go to step 4
OK


3.CHECK ECM (STP AND ST1- VOLTAGE)
Land Cruiser. Urj200, 202 Grj200 Vdj200.1Vd-Ftv Engine Control.Ecd System (W/ Dpf). 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 LHD
    Tester Connection
    		Brake Pedal Condition
    		Specified Condition
    A38-35 (ST1-) - Body ground
    		Released
    		11 to 14 V
    Depressed
    		0 to 3 V
    A38-13 (STP) - Body ground
    		Released
    		0 to 3 V
    Depressed
    		11 to 14 V
    Standard Voltage:
    for RHD
    Tester Connection
    		Brake Pedal Condition
    		Specified Condition
    A52-35 (ST1-) - Body ground
    		Released
    		11 to 14 V
    Depressed
    		0 to 3 V
    A52-13 (STP) - Body ground
    		Released
    		0 to 3 V
    Depressed
    		11 to 14 V
    Text in Illustration
    *A
    		for LHD
    *B
    		for RHD
    *a
    		Brake Pedal Depressed
    *b
    		Brake Pedal Released
    *c
    		Front view of wire harness connector
    (ECM)

  1. Reconnect the ECM connector.



OK
Go to step 5

NG
Go to step 6

4.REPLACE STOP LIGHT SWITCH ASSEMBLY

  1. Replace the stop light switch assembly (Click here).



NEXT
Go to step 7

5.REPLACE ECM

  1. Replace the ECM (Click here).



NEXT
Go to step 7

6.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the harness or connector.


NEXT


7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the GTS to the DLC3.

  1. Clear the DTCs (Click here).

  1. Turn the engine switch off.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Depress and release the brake pedal.

  1. Enter the following menus: Engine and ECT / Trouble Codes.

  1. Confirm that the DTC is not output again.


NEXT

END