DESCRIPTION
Refer to DTC C051212
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DTC No.  Detection Item 
DTC Detection Condition  Trouble Area 

C05121C  Right Rear Wheel Speed Sensor Circuit Voltage Out of Range 


*1: When more than 1 wheel has a wheel speed of less than 5 km/h (3 mph), a difference of 15% is permitted.
*2: When more than 1 wheel has a wheel speed of less than 5 km/h (3 mph), a difference of 16 km/h (10 mph) is permitted.
DTC Detection Conditions: C05121C
Vehicle Condition  

Pattern 1  Pattern 2 
Pattern 3  Pattern 4 
Pattern 5  Pattern 6  
Diagnosis Condition  The vehicle is being driven in a straight line at a speed of 20 km/h (12 mph) or more and VSC/TRAC has permission to control vehicle braking. 
○  ○ 
○   
   
The vehicle speed is less than 100 km/h (62 mph). 
   
  ○ 
○  ○  
Malfunction Status  When the difference between the highest wheel speed and the lowest wheel speed is 6% or more*1 and the difference between the highest wheel speed and the second highest wheel speed is 5 km/h (3 mph) or more, the wheel speed is high compared to other speed sensors. 
○   
   
   
When the difference between the highest wheel speed and the lowest wheel speed is 6% or more*1 and the value of the wheel speed is continuously the slowest. 
  ○ 
   
    
When the difference between the highest wheel speed and the lowest wheel speed is 6% or more*1 and the wheel speed is less than 5 km/h (3 mph). 
   
○   
    
When the difference between the highest wheel speed and the lowest wheel speed is 6 km/h (4 mph) or more*2 and the difference between the highest wheel speed and the second highest wheel speed is 5 km/h (3 mph) or more, the wheel speed is high compared to other speed sensors. 
   
  ○ 
    
When the difference between the highest wheel speed and the lowest wheel speed is 6 km/h (4 mph) or more*2 and the value of the wheel speed is continuously the slowest. 
   
   
○    
When the difference between the highest wheel speed and the lowest wheel speed is 6 km/h (4 mph) or more*2 and the wheel speed is less than 5 km/h (3 mph). 
   
   
  ○  
Detection Time  Between 9 and 72 seconds or more (period changes depending on vehicle conditions). 
Between 9 and 72 seconds or more (period changes depending on vehicle conditions). 
Between 9 and 72 seconds or more (period changes depending on vehicle conditions). 
Between 9 and 72 seconds or more (period changes depending on vehicle conditions). 
Between 9 and 72 seconds or more (period changes depending on vehicle conditions). 
Between 9 and 72 seconds or more (period changes depending on vehicle conditions).  
Number of Trips  1 trip 
1 trip  1 trip 
1 trip  1 trip 
1 trip 
*1: When more than 1 wheel has a wheel speed of less than 5 km/h (3 mph), a difference of 15% is permitted.
*2: When more than 1 wheel has a wheel speed of less than 5 km/h (3 mph), a difference of 16 km/h (10 mph) is permitted.
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C05121C
Vehicle Condition  

Pattern 7  Pattern 8 
Pattern 9  
Diagnosis Condition 
The vehicle speed is 100 km/h (62 mph) or more. 
○  ○ 
○ 
Malfunction Status  When the difference between the highest wheel speed and the lowest wheel speed is 6% or more*1 and the difference between the highest wheel speed and the second highest wheel speed is 5 km/h (3 mph) or more, the wheel speed is high compared to other speed sensors. 
○   
 
When the difference between the highest wheel speed and the lowest wheel speed is 6% or more*1 and the value of the wheel speed is continuously the slowest. 
  ○ 
  
When the difference between the highest wheel speed and the lowest wheel speed is 6% or more*1 and the wheel speed is less than 5 km/h (3 mph). 
   
○  
Detection Time  Between 9 and 72 seconds or more (period changes depending on vehicle conditions). 
Between 9 and 72 seconds or more (period changes depending on vehicle conditions). 
Between 9 and 72 seconds or more (period changes depending on vehicle conditions).  
Number of Trips  1 trip 
1 trip  1 trip 
*1: When more than 1 wheel has a wheel speed of less than 5 km/h (3 mph), a difference of 15% is permitted.
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
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Procedure to clear warning lights (When not clearing DTCs)
Procedure 


PROCEDURE
1.  PRECHECK 
(a) Check that all 4 tires are of correct size, are inflated to the correct pressure, and do not show excessive signs of wear.
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HINT:
If a tire is deformed or an incorrectly sized tire or wheel is installed, this DTC may be stored.

2. 
CHECK FREEZE FRAME DATA (WHEEL SPEED) 
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: Chassis / Brake / Trouble Codes.
(d) Select a DTC to display the Freeze Frame Data.
(e) Read the freeze frame data of DTC C05121C.
Chassis > Brake
Tester Display  Measurement Item 
Range  Normal Condition 
Diagnostic Note 

FR Wheel Speed  Front wheel speed sensor RH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
FL Wheel Speed  Front wheel speed sensor LH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
RR Wheel Speed  Rear wheel speed sensor RH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
RL Wheel Speed  Rear wheel speed sensor LH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
Tester Display 

FR Wheel Speed 
FL Wheel Speed 
RR Wheel Speed 
RL Wheel Speed 
Result  Proceed to 

The value of RR Wheel Speed is more than all other values. 
A 
The value of RR Wheel Speed is less than all other values. 
B 
The value of RR Wheel Speed is less than 5 km/h (3 mph). 
C 
B  GO TO STEP 4 
C  GO TO STEP 5 

3. 
READ VALUE USING TECHSTREAM (WHEEL SPEED) 
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: Chassis / Brake / Data List.
Chassis > Brake > Data List
Tester Display  Measurement Item 
Range  Normal Condition 
Diagnostic Note 

FR Wheel Speed  Front wheel speed sensor RH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
FL Wheel Speed  Front wheel speed sensor LH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
RR Wheel Speed  Rear wheel speed sensor RH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
RL Wheel Speed  Rear wheel speed sensor LH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
Tester Display 

FR Wheel Speed 
FL Wheel Speed 
RR Wheel Speed 
RL Wheel Speed 
(d) Start the engine.
(e) Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
(f) Check the value of Wheel Speed.
OK:
The difference between the value of RR Wheel Speed and all other values is less than 6%.
HINT:
If the result of the road test is within the specified range, it is possible that this DTC was stored due to a particular situation such as wheelspin.
OK  USE SIMULATION METHOD TO CHECK 
NG  REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH 
4. 
READ VALUE USING TECHSTREAM (WHEEL SPEED) 
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: Chassis / Brake / Data List.
Chassis > Brake > Data List
Tester Display  Measurement Item 
Range  Normal Condition 
Diagnostic Note 

FR Wheel Speed  Front wheel speed sensor RH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
FL Wheel Speed  Front wheel speed sensor LH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
RR Wheel Speed  Rear wheel speed sensor RH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
RL Wheel Speed  Rear wheel speed sensor LH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
Tester Display 

FR Wheel Speed 
FL Wheel Speed 
RR Wheel Speed 
RL Wheel Speed 
(d) Start the engine.
(e) Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
(f) Check the value of Wheel Speed.
OK:
The difference between the value of RR Wheel Speed and all other values is less than 6%.
HINT:
If the result of the road test is within the specified range, it is possible that this DTC was stored due to a particular situation such as brake drag.
OK  USE SIMULATION METHOD TO CHECK 
NG  REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH 
5. 
READ VALUE USING TECHSTREAM (RR WHEEL SPEED) 
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Enter the following menus: Chassis / Brake / Data List.
Chassis > Brake > Data List
Tester Display  Measurement Item 
Range  Normal Condition 
Diagnostic Note 

RR Wheel Speed  Rear wheel speed sensor RH reading 
Min.: 0.0 km/h (0 mph), Max.: 6553.5 km/h (4072 mph) 
Vehicle stopped: 0.0 km/h (0.0 mph) 
When driving at constant speed: No large fluctuations 
Tester Display 

RR Wheel Speed 
(d) Start the engine.
(e) Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
(f) Check the value of RR Wheel Speed.
OK:
The value of RR Wheel Speed is 5 km/h (3 mph) or more.
HINT:
If the result of the road test is within the specified range, it is possible that this DTC was stored due to a particular situation such as wheelspin, brake drag or wheel lockup.
When a DTC is stored during operation of ABS or TRAC, the system also stores vehicle control history that can be guessed the vehicle conditions.
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OK  USE SIMULATION METHOD TO CHECK 
NG  REPLACE REAR AXLE HUB AND BEARING ASSEMBLY RH 