DTC C0500-1F: Left Front Wheel Speed Sensor Circuit Intermittent; DTC C0506-1F: Right Front Wheel Speed Sensor Circuit Intermittent [09/2018 - 10/2023]: Description

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU (brake actuator assembly). These signals are used for brake control.

Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU (brake actuator assembly).

HINT:

When the connectors between the speed sensor and skid control ECU (brake actuator assembly) are connected, the following waveform is output.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
C0500-1F	Left Front Wheel Speed Sensor Circuit Intermittent	Any of the following is detected: When the +BS terminal voltage is 17.4 V or less, an open in the sensor signal circuit of a malfunctioning area occurs 255 times or more. When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds. When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.	Sensor installation Front speed sensor LH1 Front skid control sensor wire RH2 Front speed sensor LH (front axle hub sub-assembly LH)*2 Front speed sensor rotor LH (front axle hub sub-assembly LH) Skid control ECU (brake actuator assembly) Wire harness or connector	-
C0506-1F	Right Front Wheel Speed Sensor Circuit Intermittent	Any of the following is detected: When the +BS terminal voltage is 17.4 V or less, an open in the sensor signal circuit of a malfunctioning area occurs 255 times or more. When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds. When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more.	Sensor installation Front speed sensor RH1 Front skid control sensor wire RH2 Front speed sensor RH (front axle hub sub-assembly RH)*2 Front speed sensor rotor RH (front axle hub sub-assembly RH) Skid control ECU (brake actuator assembly) Wire harness or connector	-

*1: for AWD
*2: for 2WD

C0500-1F DTC DETECTION CONDITIONS

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	When the +BS terminal voltage is 17.4 V or less	◦	◦	◦
Malfunction Status	An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more	◦	-	-
	At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds	-	◦	-
	At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation	-	-	◦
Detection Time		-	-	15 seconds or more.
Number of Trips		1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

C0506-1F DTC DETECTION CONDITIONS

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnosis Condition	When the +BS terminal voltage is 17.4 V or less	◦	◦	◦
Malfunction Status	An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more	◦	-	-
	At a vehicle speed of 20 km/h (12 mph) or more, noise occurs in the sensor signals of a malfunctioning wheel 75 times or more within 5 seconds	-	◦	-
	At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation	-	-	◦
Detection Time		-	-	15 seconds or more.
Number of Trips		1 trip	1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.