DTC C1273-73: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); DTC C1274-74: Low Output Signal of Rear Speed Sensor LH (Test Mode DTC); DTC C1466-33: Rear Speed Sensor RH Circuit; DTC C1467-34: Rear Speed Sensor LH Circuit [02/2014 - ]: Description

Each speed sensor detects the wheel speed and sends signals to the skid control ECU assembly. These signals are used for ABS control.

DTCs C1273-73 and C1274-74 are cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1273-73 and C1274-74 are output only in Test Mode.

Fig 1: Speed Sensor Rotor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1273-73	Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)	-	Detected only during Test Mode.	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH)	ABS Test Mode DTC
C1274-74	Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)	-	Detected only during Test Mode.	Open or short in speed sensor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Sensor installation Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH)	ABS Test Mode DTC
C1466-33	Rear Speed Sensor RH Circuit	277 278 279 280 281 288	INF Code: 277 At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit. INF Code: 278 A malfunction occurs in 2 or more wheels. INF Code: 279 An open is detected in the speed sensor signal circuit for 0.5 seconds or more. INF Code: 280 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. INF Code: 281 Frequency of 2.4 kHz or more is input. INF Code: 288 Either of the following is detected: When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more. When IG1 voltage is 9.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.	INF Code: 277, 278, 279, 280 Open or short in speed sensor Improperly installed speed sensor, or abnormal clearance between sensor and rotor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit Rear speed sensor RH Skid control ECU assembly INF Code: 281 Open or short in speed sensor Open or short in wire harness Rear speed sensor RH Rear speed sensor rotor RH (Rear axle hub and bearing assembly RH) INF Code: 288 Open or short in wire harness Skid control ECU assembly	ABS DTC
C1467-34	Rear Speed Sensor LH Circuit	290 291 292 293 294 301	INF Code: 290 At a vehicle speed of 10 km/h (6 mph) or more, an open or short signal occurs in the speed sensor circuit. INF Code: 291 A malfunction occurs in 2 or more wheels. INF Code: 292 An open is detected in the speed sensor signal circuit for 0.5 seconds or more. INF Code: 293 Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. INF Code: 294 Frequency of 2.4 kHz or more is input. INF Code: 301 Either of the following is detected: When IG1 voltage is 9.5 V or more, sensor supply voltage drops for 0.5 seconds or more. When IG1 voltage is 9.5 V or more, sensor supply voltage fluctuates for 60 seconds or more.	INF Code: 290, 291, 292, 293 Open or short in speed sensor Improperly installed speed sensor, or abnormal clearance between sensor and rotor Open or short in wire harness Improperly connected connector, deformation or corrosion of terminals Resistance in speed sensor circuit Rear speed sensor LH Skid control ECU assembly INF Code: 294 Open or short in speed sensor Open or short in wire harness Rear speed sensor LH Rear speed sensor rotor LH (Rear axle hub and bearing assembly LH) INF Code: 301 Open or short in wire harness Skid control ECU assembly	ABS DTC

HINT:

DTCs C1466-33 and C1273-73 are for the rear speed sensor RH.
DTCs C1467-34 and C1274-74 are for the rear speed sensor LH.