Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
1Gr-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200
CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)
INSPECT STOP LIGHT SWITCH ASSEMBLY
CHECK ECM (STP AND ST1- VOLTAGE)
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 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 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 |
- [OFF] denotes ground potential.
- [ON] denotes battery potential (+B).
- On the GTS, the Data List items Stop Light Switch and ST1 are both ON when the brake pedal is depressed because the characteristics of ST1 indication are the opposite of the characteristics of Stop Light Switch indication.
| DTC No. | DTC Detection Condition | Trouble Area |
| P0504 | Conditions (a), (b) and (c) are met for 0.5 seconds or more (1 trip detection logic): (a) Ignition switch is ON. (b) Brake pedal is released. (c) STP signal is OFF when the ST1- signal is OFF. |
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WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- Inspect the fuses of circuits related to this system before performing the following 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, if the air-fuel ratio was lean or rich, 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 ignition switch to ON.
- Turn the GTS on.
- Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Stop Light Switch and ST1.
- Check the Data List when the brake pedal is depressed and released.
| Brake Pedal Operation | Stop Light Switch | ST1 |
| Depressed | ON | ON |
| Released | OFF | OFF |
| 1.CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE) |
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Disconnect the stop light switch assembly connector.
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 11 to 14 V
Text in Illustration *a Front view of wire harness connector
(to Stop Light Switch Assembly)
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| OK | |
| 2.INSPECT STOP LIGHT SWITCH ASSEMBLY |
Inspect the stop light switch assembly (Click here).
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| OK | |
| 3.CHECK ECM (STP AND ST1- VOLTAGE) |
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Disconnect the ECM connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for LHD Tester Connection Brake Pedal Operation Specified Condition A38-35 (ST1-) - Body ground Released 7.5 to 14 V Depressed 0 to 1.5 V A38-36 (STP) - Body ground Released 0 to 1.5 V Depressed 7.5 to 14 V for RHD Tester Connection Brake Pedal Operation Specified Condition A52-35 (ST1-) - Body ground Released 7.5 to 14 V Depressed 0 to 1.5 V A52-36 (STP) - Body ground Released 0 to 1.5 V Depressed 7.5 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
(to ECM)
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| OK | ||
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