ABS (Antilock Brake System)
BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: C0200/31,C0205/32,C1271/71,C1272/72: Right Front Wheel Speed Sensor Signal Malfunction
C1272/72 - Low 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 and C1272/72 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1271/71 and C1272/72 are output only in the Test Mode.
HINT
* DTCs C0200/31 and C1271/71 are for the front speed sensor RH.
* DTCs C0205/32 and C1272/72 are for the front speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Select the Data List mode on the Techstream Data List / Active Test.
ABS/VSC/TRAC:
(e) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.
HINT
There is tolerance of +-10% in the speedometer indication.
OK:
There is almost no difference with the displayed speed value.
NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.
2. PERFORM TEST MODE (SIGNAL CHECK)
(a) Perform sensor check in Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are erased.
NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTC ABS (Antilock Brake System).
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 30 seconds.
(d) Check if the same DTC(s) is recorded ABS (Antilock Brake System).
Result
B -- REPLACE FRONT SPEED SENSOR
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting
4. CHECK IF SKID CONTROL ECU AND FRONT SPEED SENSOR CONNECTORS ARE SECURELY CONNECTED
(a) Check if the skid control ECU and the front speed sensor connectors are securely connected.
NEXT -- Continue to next step.
5. RECONFIRM DTC
(a) Clear the DTC ABS (Antilock Brake System).
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 30 seconds.
(d) Check if the same DTC is recorded ABS (Antilock Brake System).
Result
B -- END
A -- Continue to next step.
6. CHECK FRONT SPEED SENSOR INSTALLATION
(a) Turn the ignition switch off.
(b) Check the speed sensor installation.
OK:
There is no clearance between the sensor and the front steering knuckle.
The installation nut is tightened properly.
Torque
8.3 N*m (85 kgf*cm, 73 in.*lbf)
NG -- INSTALL FRONT SPEED SENSOR CORRECTLY Installation
OK -- Continue to next step.
7. CHECK FRONT SPEED SENSOR
(a) Remove the front speed sensor Removal.
(b) Visually check the speed sensor for deformation and damage.
OK:
No deformation or damage.
There is no gap between the sensor and front steering knuckle.
NG -- REPLACE FRONT SPEED SENSOR Removal
OK -- Continue to next step.
8. CHECK FRONT SPEED SENSOR TIP
(a) Check the speed sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
NG -- CLEAN OR REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
9. INSPECT FRONT SPEED SENSOR
(a) Disconnect front speed sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
Text in Illustration
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NG -- REPLACE FRONT SPEED SENSOR Removal
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (SPEED SENSOR WIRE)
(a) Disconnect front speed sensor wire.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
Text in Illustration
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NG -- REPLACE SPEED SENSOR WIRE
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR WIRE)
(a) Disconnect the skid control ECU connector.
(b) Disconnect the front speed sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
12. INSPECT SKID CONTROL ECU (SENSOR INPUT)
(a) Reconnect the skid control ECU connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
for LH
Text in Illustration
NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.
13. REPLACE FRONT SPEED SENSOR
(a) Turn the ignition switch off.
(b) Replace the front speed sensor Removal.
NOTICE:
Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
NEXT -- Continue to next step.
14. RECONFIRM DTC
(a) Clear the DTC ABS (Antilock Brake System).
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 30 seconds.
(d) Check if the same DTC is recorded ABS (Antilock Brake System).
Result
B -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting
A -- Continue to next step.
15. REPLACE FRONT AXLE HUB BEARING
(a) Turn the ignition switch off.
(b) Replace the front axle hub bearing Removal.
HINT
The front speed sensor rotor is incorporated into the front axle hub bearing.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
16. RECONFIRM DTC
(a) Clear the DTC ABS (Antilock Brake System).
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more for at least 30 seconds.
(d) Check if the same DTC is recorded ABS (Antilock Brake System).
Result
B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
A -- END