Foreign Object is Attached on Tip of Front Speed Sensor LH - Vehicle Stability Control System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0200/31: Right Front Wheel Speed Sensor Signal

DTC C0200/31 - Right Front Wheel Speed Sensor Signal

DTC C0205/32 - Left Front Wheel Speed Sensor Signal

DTC C1235/35 - Foreign Object is Attached on Tip of Front Speed Sensor RH

DTC C1236/36 - Foreign Object is Attached on Tip of Front Speed Sensor LH

DTC C1271/71 - Low Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC C1272/72 - Low Output Signal of Front Speed Sensor LH (Test Mode DTC)

DTC C1275/75 - Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC)

DTC C1276/76 - Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensors detect the wheel speeds and send appropriate signals to the skid control ECU.
Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change as the rotors turn.
The speed sensors detect those magnetic changes and send pulse signals to the skid control ECU. The ECU monitors the wheel speeds through these pulse signals to control the ABS control system.
DTCs C1271/71, C1272/72, C1275/75 and C1276/76 can be deleted when the speed sensor sends a vehicle speed signal or the test mode ends. DTCs C1271/71, C1272/72, C1275/75/75 and C1276/76 are output only in the test mode.









HINT:
- DTCs C0200/31 and C1235/35 relate to the front speed sensor RH.
- DTCs C0205/32 and C1236/36 relate to the front speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: Check the speed sensor signal in test mode after cleaning or replacement .

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
(a) Using the Data List of the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC .

ABS / VSC / TRAC:





OK:
There are no momentary interruptions.
HINT: Perform the above inspection before removing the sensor and connector.

NG -- CHECK AND REPAIR HARNESS AND CONNECTOR (SPEED SENSOR CIRCUIT)
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
(a) Check the Data List for proper functioning of the front speed sensor.

ABS / VSC / TRAC:





OK:
There is almost no difference between actual wheel speed and displayed speed value.
HINT: There is a tolerance of +-10% in the speedometer indication.

NG -- INSPECT FRONT SPEED SENSOR (INSTALLATION)
OK -- Continue to next step.
3. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)
(a) Perform a test mode inspection and check for DTCs .
OK:
No DTC output.
NG -- CHECK AND REPAIR HARNESS AND CONNECTOR (SPEED SENSOR CIRCUIT)
OK -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTC(s) .
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(d) Check if the same DTC(s) is output .

Result





B -- REPLACE FRONT SPEED SENSOR
A -- END
5. INSPECT FRONT SPEED SENSOR (INSTALLATION)





(a) Check that the speed sensor installation bolt is tightened properly.
OK:
The installation bolt is tightened properly, and there is no clearance between the sensor and front steering knuckle.
Torque: 8.5 Nm (87 kgf-cm, 75 in-lbf)
HINT: If the installation portion of the sensor is dirty, clean it and reinstall the sensor.
Check the speed sensor after the speed sensor replacement .

NG -- TIGHTEN BOLT PROPERLY OR REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
6. CHECK SPEED SENSOR (TIP)
(a) Remove the front speed sensor.
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
HINT: Check the speed sensor signal after the speed sensor clearing or replacement .

NG -- CLEAN OR REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
7. CHECK WIRE HARNESS (SKID CONTROL ECU - FRONT SPEED SENSOR)





(a) Disconnect the A19 ECU connector.
(b) Disconnect the A41 and A42 sensor connectors.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
for LH
for RH










NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
8. CHECK SKID CONTROL ECU (SENSOR INPUT VOLTAGE)





(a) Disconnect the A41 and A42 sensor connectors.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
OK -- Continue to next step.
9. RECONFIRM DTC
(a) Clear the DTC(s) .
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(d) Check if the same DTC(s) is output .

Result





B -- END
A -- Continue to next step.
10. REPLACE FRONT SPEED SENSOR
(a) Replace the front speed sensor.
NEXT -- Continue to next step.
11. RECONFIRM DTC
(a) Clear the DTC(s) .
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 60 seconds.
(d) Check if the same DTC(s) is output .

Result





B -- END
A -- REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY