DTC    C1243/43    Acceleration Sensor Stuck Malfunction

DTC    C1244/44    Open or Short in Deceleration Sensor Circuit

DTC    C1245/45    Acceleration Sensor Output Malfunction

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DESCRIPTION

This sensor detects vehicle deceleration. The sensor signal is used in ABS control. If the sensor functions abnormally, the ABS warning light turns ON.

DTC No.
DTC Detection Condition
Trouble Area
C1243/43
Following condition repeats 16 times:
GL1 does not change when vehicle decelerates from 30 km/h (19 mph) to 0 km/h (0 mph)
  1. Deceleration sensor
  2. Deceleration sensor circuit
C1244/44
When one of following (1 to 3) is detected:
1. Deceleration G calculated by ECU based on GL1 signal is not within -1.5 and 1.5 G for 1.2 sec.
2. When sensor operating voltage is not within 4.75 to 5.25 V
3. Deceleration sensor malfunction signal occurs more than 7 times
  1. Deceleration sensor
  2. Deceleration sensor circuit
C1245/45
Difference between value calculated from deceleration sensor value and vehicle speed exceeds 0.35 G for at least 60 seconds
  1. Deceleration sensor
  2. Deceleration sensor circuit

WIRING DIAGRAM


C108870E01


INSPECTION PROCEDURE

1.CHOOSE DIAGNOSIS METHOD

  1. Choose the diagnosis method.
    Method 
    Method
    		Proceed to
    Using intelligent tester
    		A
    Not using intelligent tester
    		B



B
Go to step 3
A


2.READ VALUE OF INTELLIGENT TESTER (DECELERATION SENSOR 1)

  1. Check the Data List for proper functioning of the deceleration sensor.

    Skid control ECU 
    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    Deceleration Sensor 1
    		Deceleration sensor 1
    reading / min.: -1.869 G, max.: 1.869 G
    		Approx. 0 +- 0.13 G when vehicle is not moving.
    		Reading changes when vehicle is shaken

    OK:
    Deceleration value changes.



OK
REPLACE BRAKE ACTUATOR ASSEMBLY
NG


3.INSPECT DECELERATION SENSOR
C108887E01

  1. Remove the console box and deceleration sensor.

  1. Connect 3 dry cell batteries of 1.5 V in series.

    HINT:
    Do not apply voltage of 6 or more to terminals 3 (VGS) and 2 (GGND).

  1. Check the output voltage of terminal 1 (GL1) when the sensor is tilted forward and rearward.

    Standard voltage:
    Tester Connection
    		Sensor Position
    		Specified Condition
    1 (GL1) - Battery's negative (-) lead
    		Horizontal
    		Approx 2.5 V
    1 (GL1) - Battery's negative (-) lead
    		Tilted forward
    		Approx 0.5 to 2.5 V
    1 (GL1) - Battery's negative (-) lead
    		Tilted rearward
    		Approx 2.5 to 4.5 V

    HINT:
    1. If the sensor is tilted too much, it may output the wrong value.
    2. If the voltage drops, the sensor should be replaced with a new one.
    3. When replacing the sensor, it should not be placed upside down.



NG
REPLACE DECELERATION SENSOR
OK


4.CHECK WIRE HARNESS (SKID CONTROL ECU - DECELERATION SENSOR)
C108888E01

  1. Disconnect the S2 ECU connector.

  1. Disconnect the A17 sensor connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    S2-4 (GL1) - A17-1 (GL1)
    		Below 1 Ω
    S2-7 (GGND) - A17-2 (GGND)
    		Below 1 Ω
    S2-28 (VGS) - A17-3 (VGS)
    		Below 1 Ω
    A17-1 (GL1) - Body ground
    		10 kΩ or higher
    A17-2 (GGND) - Body ground
    		10 kΩ or higher
    A17-3 (VGS) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK FOR DTC

  1. Install the deceleration sensor to the vehicle.

  1. Clear the DTCs.

  1. Drive the vehicle at 6 km/h (4 mph) or more.

  1. Check for DTCs.
    Result 
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B



B
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY