DTC    P0724    Brake Switch "B" Circuit High

для подготовки Нажмите здесь


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, this 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
The stop light switch remains ON even when the vehicle repeats 5 cycles of STOP (less than 1.86 mph ([3 km/h]) and GO (18.65 mph [30 km/h] or more)
(2 trip detection logic)
  1. Short in stop light switch signal circuit
  2. Stop light switch
  3. ECM

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains ON. When the stop light switch remains ON during "stop and go" driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on and the ECM stores the DTC. The vehicle must stop (less than 1.86 mph [3 km/h]) and go (18.65 mph [30 km/h] or more) 5 times during 2 driving cycles, in order to detect a malfunction.

WIRING DIAGRAM

Refer to DTC P0504 (see page Нажмите здесь).

INSPECTION PROCEDURE

УКАЗАНИЕ:
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, 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 engine switch on (IG) and turn the tester ON.

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

  1. Read the values displayed on the tester.


OK:

Item
Measurement Item: Range (display)
Normal Condition
Stop Light Switch
Stop light switch status:
ON or OFF
  1. ON: Brake pedal is depressed
  2. OFF: Brake pedal is released



OK
CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)
NG


2.INSPECT STOP LIGHT SWITCH ASSEMBLY
A107172E07

  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 Condition
    		 Specified Condition
    1 - 2
    		Switch pin free
    		Below 1 Ω
    3 - 4
    		10 kΩ or higher
    1 - 2
    		Switch pin pushed in
    		10 kΩ or higher
    3 - 4
    		Below 1 Ω



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY
OK


3.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)
A150335E01

  1. Disconnect the A35 stop light switch connector.

  1. Disconnect the A14 ECM connector.

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

    Standard Resistance (Check for open):
    Tester Connection
    		Condition
    		Specified Condition
    A35-1 (Stop light switch) - A14-13 (STP)
    		Always
    		Below 1 Ω
    A35-4 (Stop light switch) - A14-12 (ST1-)
    		Always

    Standard Resistance (Check for short):
    Tester Connection
    		Condition
    		Specified Condition
    A35-1 (Stop light switch) or A14-13 (STP) - Body ground
    		Always
    		10 kΩ or higher
    A35-4 (Stop light switch) or A14-12 (ST1-) - Body ground
    		Always



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Нажмите здесь)