C1271
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1271, C1272, C1330, C1331, C1464, C1465: Low Output Signal of Front Speed Sensor RH (Test Mode DTC)
C1465 - Front Speed Sensor LH
DESCRIPTION
Each speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used by the ABS control system.
The speed sensor rotors have 48 serrations. Hall IC type speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.
DTCs C1271 and C1272 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271 and C1272 are output only in Test Mode.
*1: If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.
*2: If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.
HINT
* DTCs C1271, C1330 and C1464 are for the front speed sensor RH.
* DTCs C1272, C1331 and C1465 are for the front speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Select the Data List using the Techstream Data List / Active Test.
ABS/VSC/TRAC
(d) Check the speed value output from the speed sensor displayed on the Techstream.
HINT
Factors that affect the indicated vehicle speed include tire size, tire pressure, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart On-Vehicle Inspection.
OK:
The speed value output from the speed sensor displayed on the Techstream is similar to the speed indicated on the speedometer.
NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.
2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)
(a) Turn the ignition switch off.
(b) Perform the sensor check using the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are not output.
NG -- CHECK FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Turn the ignition switch off.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Turn the ignition switch off.
(d) Start the engine.
(e) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.
(f) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- REPLACE FRONT SPEED SENSOR
A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting
4. 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 bolt is tightened properly.
Torque
8.5 N*m (87 kgf*cm, 75 in.*lbf)
NG -- INSTALL FRONT SPEED SENSOR CORRECTLY Installation
OK -- Continue to next step.
5. CHECK FRONT SPEED SENSOR AND SENSOR ROTOR
(a) Remove the front speed sensor and the component with the sensor rotor Removal for speed sensor, Removal 2GR-FE for sensor rotor, and/or Removal 2AR-FE for sensor rotor).
(b) Check the speed sensor tip and speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the sensor tip and rotor.
NOTICE:
* If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.
* Check the speed sensor signal after cleaning or replacement Test Mode Procedure.
NG -- CLEAN OR REPLACE FRONT SPEED SENSOR OR COMPONENT WITH SENSOR ROTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)
(a) Install the front speed sensor and the component with the sensor rotor.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(c) Disconnect the skid control ECU connector and the front speed sensor connector.
(d) 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.
7. RECONFIRM DTC
(a) Reconnect the skid control ECU connector and the front speed sensor connector.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Turn the ignition switch off.
(d) Start the engine.
(e) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.
(f) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting
A -- Continue to next step.
8. REPLACE FRONT SPEED SENSOR
(a) Turn the ignition switch off.
(b) Replace the front speed sensor Removal.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
9. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.
(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- END
A -- Continue to next step.
10. REPLACE FRONT DRIVE OUTBOARD JOINT SHAFT ASSEMBLY
(a) Turn the ignition switch off.
(b) Replace the front speed sensor rotor (front drive outboard joint shaft assembly) Removal for 2GR-FE, or Removal for 2AR-FE).
HINT
If the front speed sensor rotor needs to be replaced, replace the front drive outboard joint shaft assembly.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
11. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.
(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
HINT
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts Problem Symptoms Table.
B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
A -- END