ABS (Antilock Brake System)

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: C1243/43: Acceleration Sensor Stuck Malfunction

DTC C1243/43 - Acceleration Sensor Stuck Malfunction

DTC C1244/44 - Open or Short in Deceleration Sensor Circuit

DTC C1245/45 - Acceleration Sensor Output Malfunction

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING DATA LIST (DECELERATION SENSOR)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn Techstream ON.
(d) Select the Data List mode on Techstream.

ABS/VSC/TRAC





(e) Check that the deceleration value of the deceleration sensor displayed on Techstream changes when the vehicle is tilted.
OK:
Deceleration value must change.
NG -- INSPECT DECELERATION SENSOR
OK -- Continue to next step.
2. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Check if the same DTCs are detected.





B -- END
A -- REPLACE BRAKE ACTUATOR
3. INSPECT DECELERATION SENSOR





(a) Remove the deceleration sensor.
(b) Connect the 3 dry batteries of 1.5 V in series.
(c) Connect the VGS terminal to the batteries' positive (+) terminal and the GGND terminal to the batteries' negative (-) terminal.
(d) Apply about 4.5 V between the VGS and GGND terminals.

NOTE: Do not apply voltage of 6 V or more to terminals VGS and GGND.

(e) Check the output voltage of the GL1 terminal when the sensor is tilted forward and backward.
Standard Voltage:





HINT:
- If the sensor is tilted too much it may show the wrong value.
- If dropped, the sensor should be replaced with a new one.
- Check and ensure the correct installation direction of the deceleration sensor.

NG -- REPLACE DECELERATION SENSOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - DECELERATION SENSOR)





(a) Disconnect the skid control ECU connector.
(b) Disconnect the deceleration sensor connector.
(c) Measure the resistance.
Standard Resistance:





(d) Measure the resistance.
Standard Resistance:





(e) Reconnect the deceleration sensor connector.
(f) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE BRAKE ACTUATOR