DTC    51    Stop Light Switch Circuit Malfunction

для подготовки Нажмите здесь


DESCRIPTION

In this system, the signal of the stop light switch is used to judge whether the stop light system is abnormal or not.
The stop light switch has a duplex system (signals STP and ST1-) to recognize the abnormality when the signals of depressing and releasing the brake pedal are detected simultaneously.

УКАЗАНИЕ:
The normal condition is shown in the table below.

Signal
Brake Pedal Released
In Transition
Brake Pedal Depressed
STP
Off
On
On
ST1-
On
On
Off

DTC No.
DTC Detection Condition
Trouble Area
51
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) STP signal is off when ST1- signal is off.
  1. Open or short in stop light switch signal circuit
  2. Stop light switch
  3. ECM


WIRING DIAGRAM


A00JUGXE01


INSPECTION PROCEDURE

ПРИМЕЧАНИЕ:
Inspect the fuses for circuits related to this system before performing the following 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, and other data from the time the malfunction occurred.


When using intelligent tester:

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. Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light SW.

    OK:
    Brake Pedal
    		Display
    Depressed
    		Stop Light SW ON
    Released
    		Stop Light SW OFF



NG
Перейдите к шагу 2
OK

CHECK FOR INTERMITTENT PROBLEMS (Нажмите здесь)  

2.CHECK ECM (STP, ST1- VOLTAGE)


    A00JW80E06

  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
    G61-19 (STP) - C101-14 (E1)
    		Depressed
    		11 to 14 V
    Released
    		Below 1.5 V
    G62-11 (ST1-) - C101-14 (E1)
    		Depressed
    		Below 1.5 V
    Released
    		11 to 14 V

    Text in Illustration 
    *a
    		Brake pedal depressed
    *b
    		Brake pedal released
    *c
    		Component with harness connected
    (ECM)



NG
Перейдите к шагу 3
OK

REPLACE ECM (Нажмите здесь)  

3.INSPECT STOP LIGHT SWITCH

  1. Inspect the stop light switch (See page Нажмите здесь).



NG
REPLACE STOP LIGHT SWITCH (Нажмите здесь)
OK


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

  1. Disconnect the stop light switch connector.

  1. Disconnect the ECM connectors.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A5-1 - G61-19 (STP)
    		Always
    		Below 1 Ω
    A5-3 - G62-11 (ST1-)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A5-1 or G61-19 (STP) - Body ground
    		Always
    		10 kΩ or higher
    A5-3 or G62-11 (ST1-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the stop light switch connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE POWER SOURCE CIRCUIT (Нажмите здесь)  


When not using intelligent tester:

1.CHECK STOP LIGHT (OPERATION)

  1. Check if the stop lights go on and off normally when the brake pedal is depressed and released.

    OK:
    The stop lights go on and off normally.



NG
REPAIR STOP LIGHT SWITCH CIRCUIT
OK


2.CHECK ECM (STP, ST1- VOLTAGE)


    A00JW80E06

  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
    G61-19 (STP) - C101-14 (E1)
    		Depressed
    		11 to 14 V
    Released
    		Below 1.5 V
    G62-11 (ST1-) - C101-14 (E1)
    		Depressed
    		Below 1.5 V
    Released
    		11 to 14 V

    Text in Illustration 
    *a
    		Brake pedal depressed
    *b
    		Brake pedal released
    *c
    		Component with harness connected
    (ECM)



NG
Перейдите к шагу 3
OK

REPLACE ECM (Нажмите здесь)  

3.INSPECT STOP LIGHT SWITCH

  1. Inspect the stop light switch (See page Нажмите здесь).



NG
REPLACE STOP LIGHT SWITCH (Нажмите здесь)
OK


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

  1. Disconnect the stop light switch connector.

  1. Disconnect the ECM connectors.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A5-1 - G61-19 (STP)
    		Always
    		Below 1 Ω
    A5-3 - G62-11 (ST1-)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    A5-1 or G61-19 (STP) - Body ground
    		Always
    		10 kΩ or higher
    A5-3 or G62-11 (ST1-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the stop light switch connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE POWER SOURCE CIRCUIT (Нажмите здесь)