BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS ANTI-LOCK BRAKE SYSTEM C1271 Low Output Signal of Front Speed Sensor RH (Test Mode DTC) C1272 Low Output Signal of Front Speed Sensor LH (Test Mode DTC) C1275 Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) C1276 Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) C1413 Front Speed Sensor RH Output Malfunction C1414 Front Speed Sensor LH Output Malfunction
DESCRIPTION
Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS.
The speed sensor rotors have 48 serrations. Hall IC type speed sensors use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect the vehicle speed even when the vehicle is nearly stationary.
DTCs C1271, C1272, C1275 and C1276 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271, C1272, C1275 and C1276 are output only in Test Mode.
- HINT:
-
Check the connection status between the sensor connector and the vehicle wire harness.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1271 | Low Output Signal of Front Speed Sensor RH (Test Mode DTC) | Detected only during Test Mode. | ·
Front speed sensor RH ·
Sensor installation ·
Front speed sensor rotor RH (front drive shaft assembly RH) |
| C1272 | Low Output Signal of Front Speed Sensor LH (Test Mode DTC) | Detected only during Test Mode. | ·
Front speed sensor LH ·
Sensor installation ·
Front speed sensor rotor LH (front drive shaft assembly LH) |
| C1275 | Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) | Detected only during Test Mode. | Front speed sensor rotor RH (front drive shaft assembly RH) |
| C1276 | Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) | Detected only during Test Mode. | Front speed sensor rotor LH (front drive shaft assembly LH) |
| C1413 | Front Speed Sensor RH Output Malfunction | Any of the following is detected:
1.
An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more. 2.
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. 3.
At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more. |
·
Front speed sensor RH ·
Speed sensor circuit ·
Sensor installation ·
Front speed sensor rotor RH (front drive shaft assembly RH) ·
Skid control ECU (brake actuator assembly) |
| C1414 | Front Speed Sensor LH Output Malfunction | Any of the following is detected:
1.
An open in the sensor signal circuit of a malfunctioning area occurs 255 times or more. 2.
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. 3.
At a vehicle speed of 10 km/h (6 mph) or more, noise occurs once per rotor rotation for 15 seconds or more. |
·
Front speed sensor LH ·
Speed sensor circuit ·
Sensor installation ·
Front speed sensor rotor LH (front drive shaft assembly LH) ·
Skid control ECU (brake actuator assembly) |
- HINT:
-
for C1413 and C1414: Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed.
- 1.
Drive the vehicle at 20 km/h (12 mph) for 30 seconds or more and check that the ABS warning light goes off.
2.Clear the DTCs.
- HINT:
- ·
DTC C1413 is for the front speed sensor RH.
·DTC C1414 is for the front speed sensor LH.
WIRING DIAGRAM
PROCEDURE
Using the GTS, check for any momentary interruption in the wire harness and connector corresponding to a DTC.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>CHECK FOR INTERMITTENT PROBLEMS
- Chassis > ABS/VSC/TRC > Data List
-
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-
- Chassis > ABS/VSC/TRC > Data List
-
Tester Display FR Speed Open FL Speed Open - 50003 105 200,201
- OK:
There are no momentary interruptions.
- HINT:
-
Perform the above inspection before removing the sensor and connector.
- Result:
Proceed to OK NG
OK
NG
Turn the ignition switch off.
Connect the GTS to the DLC3.
Start the engine.
Select the Data List using the GTS.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DATA LIST / ACTIVE TEST
- Chassis > ABS/VSC/TRC > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note FR Wheel Speed Front wheel speed sensor RH reading 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 wheel speed sensor LH reading 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
- Chassis > ABS/VSC/TRC > Data List
-
Tester Display FR Wheel Speed FL Wheel Speed - 50003 105 1,2
Check the speed value output from the speed sensor displayed on the GTS.
- HINT:
-
Factors that affect the indicated vehicle speed include tire size, tire pressure, 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 hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>ON-VEHICLE INSPECTION
- OK:
The speed value output from the speed sensor displayed on the GTS is similar to the speed indicated on the speedometer.
- Result:
Proceed to OK NG
OK
NG
Turn the ignition switch off.
Clear the DTCs.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR
- Chassis > ABS/VSC/TRC > Clear DTCs
- 50002 105
Turn the ignition switch off.
Start the engine.
Perform a road test.
Check if the same DTC is output.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR
- Chassis > ABS/VSC/TRC > Trouble Codes
- 50001 105
- Result:
Result Proceed to DTCs C1413 and C1414 are not output. A DTCs C1413 and/or C1414 are output. B
- HINT:
-
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
-
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE
A
Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING
B
| *1 | Front Speed Sensor |
| *a | Correct |
| *b | Incorrect |
| *c | 8.5 Nm |
| *d | No clearance |
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)
- Result:
Proceed to OK NG
OK
NG
Remove the front speed sensor and the component with the sensor rotor.
for speed sensor: Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>FRONT SPEED SENSOR>REMOVAL
for sensor rotor (for 2NZ-FE): Click hereDrivetrain>DRIVE SHAFT / PROPELLER SHAFT>FRONT DRIVE SHAFT ASSEMBLY(for 2NZ-FE)>REMOVAL
for sensor rotor (except 2NZ-FE): Click hereDrivetrain>DRIVE SHAFT / PROPELLER SHAFT>FRONT DRIVE SHAFT ASSEMBLY(for 1ZR-FE, 2ZR-FE)>REMOVAL
Check the speed sensor tip and speed sensor rotor.
- OK:
No scratches, oil, or foreign matter on the sensor tip and rotor.
- NOTICE:
- ·
If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
If there are any ferrous metal filings stuck to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign matter before replacing the sensor.
·Check the speed sensor signal after cleaning or replacement.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>TEST MODE PROCEDURE
- Result:
Proceed to OK NG
OK
NG
Install the front speed sensor and the component with the sensor rotor.
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
Disconnect the A48 skid control ECU (brake actuator assembly) connector.
Disconnect the A22 or A23 front speed sensor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for RH Tester Connection Condition Specified Condition A48-7 (FR+) - A22-2 (FR+) Always Below 1 Ω A48-7 (FR+) or A22-2 (FR+) - Body ground Always 10 kΩ or higher A48-6 (FR-) - A22-1 (FR-) Always Below 1 Ω A48-6 (FR-) or A22-1 (FR-) - Body ground Always 10 kΩ or higher
for LH Tester Connection Condition Specified Condition A48-19 (FL+) - A23-2 (FL+) Always Below 1 Ω A48-19 (FL+) or A23-2 (FL+) - Body ground Always 10 kΩ or higher A48-18 (FL-) - A23-1 (FL-) Always Below 1 Ω A48-18 (FL-) or A23-1 (FL-) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG
| *a | Front view of wire harness connector
(to Front Speed Sensor) |
Reconnect the A48 skid control ECU (brake actuator assembly) connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for RH Tester Connection Condition Specified Condition A22-2 (FR+) - Body ground Ignition switch ON 5.7 to 14 V
for LH Tester Connection Condition Specified Condition A23-2 (FL+) - Body ground Ignition switch ON 5.7 to 14 V
- NOTICE:
-
Check the speed sensor signal after replacement.
-
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>TEST MODE PROCEDURE
- HINT:
-
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
-
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE
- Result:
Proceed to OK NG
OK
NG