DTC    C1247/47    Stroke Sensor Malfunction

DTC    C1346/71    Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC)

DTC    C1392/48    Stroke Sensor Zero Point Calibration Undone

for Preparation Click here


DESCRIPTION

The stroke sensor inputs the pedal stroke into the skid control ECU.
DTC C1346/71 can be deleted when the brake pedal stroke sensor sends a stroke sensor signal or the Test Mode ends. DTC C1346/71 is output only in the Test Mode.

DTC No.
INF Code
DTC Detecting Condition
Trouble Area
C1247/47
171
Sensor power source voltage (VCSK) is 3.6 V or less or 4.95 V or more for at least 1.2 sec.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
  3. Brake pedal stroke sensor power supply
  4. Skid control ECU
C1247/47
172
Ratio of sensor output voltage 1 (SKS1) to sensor power source voltage (VCSK) is less than 3% or 97% or more for at least 1.2 sec.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
C1247/47
173
Ratio of sensor output voltage 2 (SKS2) to sensor power source voltage (VCSK) is less than 3% or 97% or more for at least 1.2 sec.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
C1247/47
174
Sensor output 1 (SKS1) calculation value becomes 20 mm or more for at least 1.2 sec. at an interval of 0.006 sec. (changes due to interference).
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
C1247/47
175
Sensor output 2 (SKS2) calculation value becomes 20 mm or more for at least 1.2 sec. at an interval of 0.006 sec. (changes due to interference).
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
C1247/47
176
Zero point stored value (ratio to power source voltage) of sensor output 1 (SKS1) is 0.46 or more or 0.03 or less.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
  3. Sensor installation
C1247/47
177
Zero point stored value (ratio to power source voltage) of sensor output 2 (SKS2) is 0.97 or more or 0.48 or less.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
C1247/47
179
  1. Sum of SKS1/VSCK and SKS2/VSCK is 1.155 or more or 0.845 or less for at least 1 sec.
  2. Difference between sensor output 1 (SKS1) and sensor output 2 (SKS2) is excessively large for at least 0.2 sec.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
C1247/47
180
  1. Difference between zero point output value and stored value is 0.5 or more for at least 0.05 sec.
  2. Short between SKS1 and SKS2 output line.
  1. Brake pedal stroke sensor
  2. Brake pedal stroke sensor circuit
  3. Skid control ECU
C1392/48
178
Zero point calibration of stroke sensor is unfinished.
  1. Brake pedal stroke sensor zero point calibration undone (initialization of linear solenoid valve and calibration undone)
  2. Skid control ECU

WIRING DIAGRAM


F047301E02


INSPECTION PROCEDURE

NOTICE:
When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration (Click here).

1.CHECK BRAKE PEDAL

  1. Check that the brake pedal and the brake pedal stroke sensor are properly installed and that the pedal can be operated normally.

  1. Check the brake pedal height.

    OK:
    The brake pedal is securely installed.
    The pedal height is within the specified range (Click here).



NG
ADJUST BRAKE PEDAL
OK


2.READ VALUE OF INTELLIGENT TESTER (BRAKE PEDAL STROKE SENSOR)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TRAC: 
    Item
    		Measurement Item /
    Range (Display)
    		Normal condition
    Stroke Sensor
    		Stroke sensor /
    min.:0 V, max.: 5 V
    		When brake pedal is released:
    0.7 to 1.3 V
    Stroke Sensor 2
    		Stroke sensor 2 /
    min.: 0 V, max.: 5 V
    		When brake pedal is released:
    3.7 to 4.3 V

  1. Read the pedal stroke sensor voltage value on the intelligent tester screen.

    OK:
    The value displayed on the intelligent tester is within the normal range.



NG
Go to step 5
OK


3.PERFORM INITIALIZATION OF LINEAR SOLENOID VALVE AND CALIBRATION

NEXT


4.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Turn the ignition switch on.

  1. Check the same DTCs are recorded (Click here).

    Result:

    Condition
    		Proceed To
    DTC is output
    		A
    DTC is not output
    		B

    HINT:
    This DTC may be memorized due to a malfunction in the connector terminal connection, etc.



B
END
A


5.CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND BRAKE PEDAL STROKE SENSOR)


    F047488E02

  1. Disconnect the skid control ECU connector and brake pedal stroke sensor connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    S39-6 (VCSK) - B20-3 (VCSK)
    		Below 1 Ω
    S39-8 (SKG) - B20-1 (SKG)
    		Below 1 Ω
    S39-21 (SKS) - B20-4 (SKS1)
    		Below 1 Ω
    S39-22 (SKS2) - B20-2 (SKS2)
    		Below 1 Ω

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

    Resistance:
    Tester Connection
    		Specified Condition
    S39-6 (VCSK) - Body ground
    		10 kΩ or higher
    S39-8 (SKG) - Body ground
    		10 kΩ or higher
    S39-21 (SKS) - Body ground
    		10 kΩ or higher
    S39-22 (SKS2) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.INSPECT SKID CONTROL ECU (VCSK, SKG TERMINAL)


    F047485E21

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

    HINT:
    Measure the voltage from the back side of the connector with the connector connected to the skid control ECU.

    Voltage:
    Tester Connection
    		Specified Condition
    S39-6 (VCSK) - S39-8 (SKG)
    		3.6 to 4.95 V



NG
REPLACE SKID CONTROL ECU
OK


7.INSPECT SKID CONTROL ECU (SKS1, SKS2 TERMINAL)
F047485E22

  1. Connect the brake pedal stroke sensor connector.

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

    HINT:
    1. Measure the voltage from behind the connector with the connector connected to the skid control ECU.
    2. Slowly depress the brake pedal and check if the voltage between the skid control ECU terminal and body ground changes in accordance with the pedal operation.

    Voltage:
    Tester Connection
    		Specified Condition
    S39-21 (SKS) - Body ground
    		1.8 to 3.1 V
    S39-22 (SKS2) - Body ground
    		1.8 to 3.1 V



NG
REPLACE BRAKE PEDAL STROKE SENSOR
OK

REPLACE SKID CONTROL ECU