Sfi System - P0724(2010/08 - )

Brand:

Toyota

Model Name:

Camry ACV40 GSV40

Manual:

Repair Manual

Section:

2Az-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Read value using intelligent tester (stop light switch)

  5. Inspect stop light switch assembly

  6. Check harness and connector (ecm - stop light switch assembly)

DTC P0724 Brake Switch "B" Circuit High


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DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling, while driving in lock-up condition, when brakes are suddenly applied.
When the brake pedal is depressed, the stop light switch sends a signal to the ECM. Then the ECM cancels the operation of the lock-up clutch while braking is in progress.

DTC No.
DTC Detection Condition
Trouble Area
P0724
Stop light switch assembly remains on even when vehicle is driven in GO (30 km/h (18.65 mph) or more) and STOP (less than 3 km/h (1.86 mph)) pattern 5 times (2 trip detection logic)
  1. Short in stop light switch assembly signal circuit
  2. Stop light switch assembly
  3. ECM

WIRING DIAGRAM


Using the intelligent tester to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. Reading the Data List information early in troubleshooting is one way to save diagnostic time. Camry


INSPECTION PROCEDURE

HINT:
  1. Using the intelligent tester to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. Reading the Data List information early in troubleshooting is one way to save diagnostic time.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.
1.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the value displayed on the tester when the brake pedal is depressed and released.

    OK:

    Tester Display
    		Measurement Item/Range
    		Normal Condition
    Stop Light Switch
    		Stop light switch assembly status:
    ON or OFF
    1. ON: Brake pedal depressed
    2. OFF: Brake pedal released


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Go to step 2
OK
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CHECK FOR INTERMITTENT PROBLEMS (Click here)

2.INSPECT STOP LIGHT SWITCH ASSEMBLY
  1. Disconnect the stop light switch assembly connector. Camry

  2. Disconnect the stop light switch assembly connector.

  1. Remove the stop light switch assembly.

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

    Standard Resistance:
    Tester Connection
    		Switch Position
    		Specified Condition
    1 - 2
    		Switch pin not pushed
    		Below 1 Ω
    Switch pin pushed
    		10 kΩ or higher
    3 - 4
    		Switch pin not pushed
    		10 kΩ or higher
    Switch pin pushed
    		Below 1 Ω

  1. Reinstall the stop light switch assembly.

  1. Reconnect the stop light switch assembly connector.



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REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)
OK
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3.CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)

  1. Disconnect the ECM connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A24-36 (STP) - Body ground
    		Brake pedal depressed
    		7.5 to 14 V
    A24-36 (STP) - Body ground
    		Brake pedal released
    		0 to 1.5 V

  1. Reconnect the ECM connector.



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REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)
OK
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REPLACE ECM (Click here)