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Home >> Lexus >> 2021 >> LS 500 Base, RWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (1 Of 4) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC C0500-23: Left Front Wheel Speed Sensor Signal Stuck Low; DTC C0506-23: Right Front Wheel Speed Sensor Signal Stuck Low [09/2018 - 10/2023] >> Description

DTC C0500-23: Left Front Wheel Speed Sensor Signal Stuck Low; DTC C0506-23: Right Front Wheel Speed Sensor Signal Stuck Low [09/2018 - 10/2023]: Description

Refer to DTCs C0500-1F and C0506-1F.

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

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C0500-23 Left Front Wheel Speed Sensor Signal Stuck Low Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more*2.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 30 seconds or more*1.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more*2.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 30 seconds or more*1.
  • Sensor installation
  • Front speed sensor RH*1
  • Front speed sensor RH (front axle hub sub-assembly RH)*2
  • Front speed sensor rotor RH (front axle hub sub-assembly RH)
  • Front skid control sensor wire RH*2
  • Wire harness or connector
 -
C0506-23 Right Front Wheel Speed Sensor Signal Stuck Low Any of the following is detected:
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more*2.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 30 seconds or more*1.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more*2.
  • When the +BS terminal voltage is 17.4 V or less at a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 30 seconds or more*1.
  • Sensor installation
  • Front speed sensor LH*1
  • Front speed sensor LH (front axle hub sub-assembly LH)*2
  • Front speed sensor rotor LH (front axle hub sub-assembly LH)
  • Front skid control sensor wire LH*2
  • Wire harness or connector
 -
  1. *1: for AWD
  2. *2: for 2WD
C0500-23 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition When the +BS terminal voltage is 17.4 V or less ◦ ◦ ◦ ◦ ◦
Malfunction Status At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*2 ◦ - - - -
At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*1 - ◦ - - -
At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) - - ◦ - -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*2 - - - ◦ -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*1 - - - - ◦
Detection Time 15 seconds or more. 30 seconds or more. 1 second or more. 15 seconds or more. 30 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip
  1. *1: for AWD
  2. *2: for 2WD

HINT: 

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

C0506-23 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5
Diagnosis Condition When the +BS terminal voltage is 17.4 V or less ◦ ◦ ◦ ◦ ◦
Malfunction Status At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*2 ◦ - - - -
At a vehicle speed of 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors*1 - ◦ - - -
At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) - - ◦ - -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*2 - - - ◦ -
At a vehicle speed of 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph)*1 - - - - ◦
Detection Time 15 seconds or more. 30 seconds or more. 1 second or more. 15 seconds or more. 30 seconds or more.
Number of Trips 1 trip 1 trip 1 trip 1 trip 1 trip
  1. *1: for AWD
  2. *2: for 2WD

HINT: 

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

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