DTC C1409: Front Speed Sensor RH Performance; DTC C1410: Front Speed Sensor LH Performance: Description

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Elements). The speed sensor rotor, which consists of 48 sets of N and S poles arranged in a circle, is integrated with the inner race of the hub bearing.

To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by the 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward waveform to the ECU.

Fig 1: View Of Speed Sensor Diagram And Signal Pulse Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC Code	DTC Detection Condition	Trouble Area
C1409 C1410	Any of the following is detected: When the vehicle is driven in reverse at a speed of 3 km/h (1.8 mph) or more and 3 of the wheel sensors detect the reverse signal, the other sensor detects a high frequency pulse 75 times while the engine switch is on (IG). At a vehicle speed of 10 km/h (6 mph) or more, the vehicle speed sensor output drops by 50% for 5 seconds. At a vehicle speed of 10 km/h (6 mph) or more, the direction of wheel rotation changes 7 times in 0.006 seconds while the engine switch is on (IG). At a vehicle speed of 30 km/h (18 mph) or more, one wheel direction is different from the other 3 wheels for 1 second. At a vehicle speed of 100 km/h (60 mph), a reverse signal is output for 1 second or more. At a vehicle speed of 30 km/h (18 mph) or more, the rotation direction of the one of the wheels is not detected normally and the rotation direction of the other 3 wheels is not the same for 1 second.	Front speed sensor RH/LH

HINT:

DTC C1409 is for the front speed sensor RH.
DTC C1410 is for the front speed sensor LH.