Dtc P0504 Brake Switch A / B Correlation

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

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 intelligent tester, 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 ignition switch ON
Conditions (a), (b) and (c) continue for 0.5 seconds or more (1 trip detection logic):
(a) Ignition switch is ON.
(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


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0504 Brake Switch A / B Correlation


INSPECTION PROCEDURE

HINT:
  1. Read freeze frame data using the intelligent tester. 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 intelligent tester.
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the tester on.
    4. Enter the following menus: Powertrain / 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 (HILUX_TGN26 RM0000012XK058X.html) and initialization (HILUX_TGN26 RM000000TIN056X.html).
  3. After replacing the fuel supply pump assembly, the ECM needs initialization (HILUX_TGN26 RM000000TIN056X.html).
  4. After replacing an injector assembly, the ECM needs registration (HILUX_TGN26 RM0000012XK058X.html).
1.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For 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
    A24-2 - Body ground
    		Always
    		11 to 14 V
    A24-3 - Body ground
    		Ignition switch ON
    		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 (HILUX_TGN26 RM0000018VE00SX.html).



NG
Go to step 4
OK


3.CHECK ECM (STP AND ST1- VOLTAGE)
Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P0504 Brake Switch A / B Correlation

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Brake Pedal Condition
    		Specified Condition
    G149-9 (ST1-) - Body ground
    		Released
    		11 to 14 V
    Depressed
    		0 to 3 V
    G149-8 (STP) - Body ground
    		Released
    		0 to 3 V
    Depressed
    		11 to 14 V
    Text in Illustration
    *a
    		Brake Pedal Depressed
    *b
    		Brake Pedal Released
    *c
    		Component with harness connected
    (ECM)


OK
Go to step 5

NG
Go to step 6

4.REPLACE STOP LIGHT SWITCH ASSEMBLY

  1. Replace the stop light switch assembly (HILUX_TGN26 RM0000018VF00UX.html).



NEXT
Go to step 7

5.REPLACE ECM

  1. Replace the ECM (HILUX_TGN26 RM0000013Z001IX.html).



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 intelligent tester to the DLC3.

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK0X2X.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Depress and release the brake pedal.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Confirm that the DTC is not output again.


NEXT

END