Dtc P0504 Brake Switch A / B Correlation

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL

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 ReleasedIn TransitionBrake Pedal Depressed
STPOFFONON
ST1-ONONOFF
[OFF] denotes ground potential.
[ON] denotes battery potential (+B).
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 PatternDTC Detection ConditionTrouble 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.
Open or short in stop light switch signal circuit
STOP fuse
IGN fuse
Stop light switch
ECM
Related Data List
DTC No.Data List
P0504Stop Light Switch

WIRING DIAGRAM

Dtc P0504 Brake Switch A / B Correlation. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • HINT:
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.
Stop light switch conditions can be checked using the GTS.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Engine and ECT / Data List / Stop Light Switch.
Check Stop Light Switch when the brake pedal is depressed and released.
Brake Pedal OperationSpecified Condition
DepressedON
ReleasedOFF
  • NOTICE:
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After replacing the ECM, the new ECM needs registration () and initialization ().
After replacing the fuel supply pump assembly, the ECM needs initialization ().
After replacing an injector assembly, the ECM needs registration ().
1.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)
Dtc P0504 Brake Switch A / B Correlation. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the stop light switch connector.

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

  • Standard Voltage:
  • Tester ConnectionConditionSpecified Condition
    A30-2 - Body groundAlways11 to 14 V
    A30-4 - Body groundEngine switch on (IG)11 to 14 V
Text in Illustration
*aFront view of wire harness connector
(to Stop Light Switch)

Reconnect the stop light switch connector.

NG
Go to step 6
OK
2.INSPECT STOP LIGHT SWITCH ASSEMBLY

Inspect the stop light switch assembly ().

NG
Go to step 4
OK
3.CHECK ECM (STP AND ST1- VOLTAGE)
Dtc P0504 Brake Switch A / B Correlation. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the ECM connector.

Turn the engine switch on (IG).

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

  • Standard Voltage:
  • for LHD
    Tester ConnectionBrake Pedal ConditionSpecified Condition
    A38-35 (ST1-) - Body groundReleased11 to 14 V
    Depressed0 to 3 V
    A38-13 (STP) - Body groundReleased0 to 3 V
    Depressed11 to 14 V
  • Standard Voltage:
  • for RHD
    Tester ConnectionBrake Pedal ConditionSpecified Condition
    A52-35 (ST1-) - Body groundReleased11 to 14 V
    Depressed0 to 3 V
    A52-13 (STP) - Body groundReleased0 to 3 V
    Depressed11 to 14 V
Text in Illustration
*Afor LHD
*Bfor RHD
*aBrake Pedal Depressed
*bBrake Pedal Released
*cFront view of wire harness connector
(ECM)

Reconnect the ECM connector.

OK
Go to step 5
NG
Go to step 6
4.REPLACE STOP LIGHT SWITCH ASSEMBLY

Replace the stop light switch assembly ().

NEXT
Go to step 7
5.REPLACE ECM

Replace the ECM ().

NEXT
Go to step 7
6.REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

NEXT
7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.

Clear the DTCs ().

Turn the engine switch off.

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

Depress and release the brake pedal.

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

Confirm that the DTC is not output again.

NEXT
END