DTC Code | DTC Name |
---|---|
C1271/71 | Low Output Signal of Front Speed Sensor RH (Test Mode DTC) |
C1272/72 | Low Output Signal of Front Speed Sensor LH (Test Mode DTC) |
C1464/31 | Front Speed Sensor RH Circuit |
C1465/32 | Front Speed Sensor LH Circuit |
DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.
DTCs C1271/71 and C1272/72 can be cleared when the speed sensor sends a wheel speed signal or when Test Mode ends. DTCs C1271/71 and C1272/72 are output only in Test Mode.
DTC Code | INF Code | DTC Detection Condition | Trouble Area |
---|---|---|---|
C1464/31 | 501 | While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more. |
|
↑ | 502 | A malfunction occurs in 2 or more wheels. | ↑ |
↑ | 503 | An open is detected in the speed sensor signal circuit for 0.05 seconds or more. |
|
↑ | 504 | Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. |
|
↑ | 506 | When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more. |
|
↑ | 507 | While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more. |
|
↑ | 508 | When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more. |
|
C1465/32 | 511 | While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more. |
|
↑ | 512 | A malfunction occurs in 2 or more wheels. | ↑ |
↑ | 513 | An open is detected in the speed sensor signal circuit for 0.05 seconds or more. |
|
↑ | 514 | Instantaneous interruption of sensor signal from the malfunctioning wheel occurs 255 times or more. |
|
↑ | 516 | When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 0.5 seconds or more. |
|
↑ | 517 | While driving at 10 km/h (6 mph) or more, speed sensor output from one wheel is 0 km/h (0 mph) for 1 second or more. |
|
↑ | 518 | When VM1 voltage is 8.6 V or more, sensor supply voltage drops for 60 seconds or more. |
|
C1271/71 C1272/72 |
- | Detected only during Test Mode. |
|
Tech Tips
DTCs C1464/31 and C1271/71 are for the front speed sensor RH.
DTCs C1465/32 and C1272/72 are for the front speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve Click here.
PROCEDURE
CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
Using the intelligent tester, check for any momentary interruptions in the wire harness and connector corresponding to a DTC Click here.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
FR Speed Open | Front speed sensor RH open detection / Error or Normal | Error: Momentary interruption Normal: Normal |
- |
FL Speed Open | Front speed sensor LH open detection / Error or Normal | Error: Momentary interruption Normal: Normal |
- |
OK |
---|
There are no momentary interruptions. |
Tech Tips
Perform the above inspection before removing the sensor and connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
READ VALUE USING INTELLIGENT TESTER (FRONT SPEED SENSOR)
Select the Data List on the intelligent tester Click here.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
FR Wheel Speed | Front speed sensor RH / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) | Vehicle stopped: 0 km/h (0 mph) | When driving at constant speed: No large fluctuations |
FL Wheel Speed | Front speed sensor LH / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) | Vehicle stopped: 0 km/h (0 mph) | When driving at constant speed: No large fluctuations |
Check that the speed value output from the speed sensor displayed on the intelligent tester.
Tech Tips
Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart Click here.
OK |
---|
The speed value output from the speed sensor displayed on the intelligent tester is the similar speed as indicated on the speedometer. |
NG |
CHECK FRONT SPEED SENSOR INSTALLATION Click here |
OK |
PERFORM TEST MODE INSPECTION (SIGNAL CHECK)
Turn the power switch off.
Perform the sensor check in the Test Mode procedure Click here.
OK |
---|
All Test Mode DTCs are cleared. |
NG |
CHECK FRONT SPEED SENSOR INSTALLATION Click here |
OK |
RECONFIRM DTC
Turn the power switch off.
Clear the DTCs Click here.
Turn the power switch on (READY).
Perform a road test.
Check if the same DTC is recorded Click here.
Result | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.
B |
REPLACE FRONT SPEED SENSOR Click here |
A |
CHECK FOR INTERMITTENT PROBLEMS Click here
CHECK FRONT SPEED SENSOR INSTALLATION
Turn the power switch off.
Check the speed sensor installation.
OK |
---|
There is no clearance between the sensor and the front steering knuckle. |
The installation bolt is tightened properly. |
Torque |
8.5 N*m (87 kgf*cm, 75 in.*lbf) |
NG |
INSTALL FRONT SPEED SENSOR CORRECTLY Click here |
OK |
CHECK FRONT SPEED SENSOR TIP
Remove the front speed sensor Click here.
Check the speed sensor tip.
OK |
---|
The sensor tip is free of scratches, oil, and foreign matter. |
Note
Check the speed sensor signal after cleaning or replacement Click here.
NG |
CLEAN OR REPLACE FRONT SPEED SENSOR |
OK |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the skid control ECU connector and the front speed sensor connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
for RH | |||||||||||||||
|
|||||||||||||||
for LH | |||||||||||||||
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT SKID CONTROL ECU (SENSOR OUTPUT)
*a | Front view of wire harness connector (to Front Speed Sensor) |
Reconnect the skid control ECU connector.
Turn the power switch on (IG).
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
for RH | ||||||
|
||||||
for LH | ||||||
|
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here |
C |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here |
A |
RECONFIRM DTC
Turn the power switch off.
Reconnect the front speed sensor connector.
Clear the DTCs Click here.
Turn the power switch on (READY).
Perform a road test.
Check if the same DTC is recorded Click here.
Result | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.
B |
CHECK FOR INTERMITTENT PROBLEMS Click here |
A |
REPLACE FRONT SPEED SENSOR
Turn the power switch off.
Replace the front speed sensor Click here.
Note
Check the speed sensor signal after replacement Click here.
NEXT |
RECONFIRM DTC
Clear the DTCs Click here.
Turn the power switch on (READY).
Perform a road test.
Check if the same DTC is recorded Click here.
Result | ||||||
---|---|---|---|---|---|---|
|
Tech Tips
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.
B |
END |
A |
REPLACE FRONT SPEED SENSOR ROTOR
Turn the power switch off.
Replace the front axle hub sub-assembly (front speed sensor rotor) Click here.
Tech Tips
The front speed sensor rotor is incorporated into the front axle hub sub-assembly.
If the front speed sensor rotor needs to be replaced, replace it together with the front axle hub sub-assembly.
Note
Check the speed sensor signal after replacement Click here.
NEXT |
RECONFIRM DTC
Clear the DTCs Click here.
Turn the power switch on (READY).
Perform a road test.
Check if the same DTC is recorded Click here.
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
Tech Tips
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step Click here.
B |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here |
C |
END |
A |
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER Click here