BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS ANTI-LOCK BRAKE SYSTEM C1273 Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) C1274 Low Output Signal of Rear Speed Sensor LH (Test Mode DTC) C1277 Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) C1278 Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC) C1415 Rear Speed Sensor RH Output Malfunction C1416 Rear Speed Sensor LH Output Malfunction

DESCRIPTION

Each speed sensor detects the 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 rows of alternating N and S magnetic poles. 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 C1273, C1274, C1277 and C1278 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1273, C1274, C1277 and C1278 are output only in Test Mode.

1.573,0.854 1.573,0.469 1.573,0.469 1.667,0.469 false 5.594,1.333 6.01,1.333 false 1.74,0.385 2.854,0.76 1.115,0.375 10 Speed Sensor 4.021,2.115 4.729,2.281 0.708,0.167 10 Low speed 6.083,1.26 6.448,1.427 0.365,0.167 10 1.4 V 6.083,1.625 6.563,1.792 0.479,0.167 10 0.7 V 4.99,2.115 5.719,2.281 0.729,0.167 10 High speed 0.969,2.177 2.26,2.344 1.292,0.167 10 Speed Sensor Rotor

HINT:: Check the connection status between the sensor connector and the vehicle wire harness.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1273	Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)	Detected only during Test Mode.	· Rear speed sensor RH (rear axle hub and bearing assembly RH) · Sensor installation · Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
C1274	Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)	Detected only during Test Mode.	· Rear speed sensor LH (rear axle hub and bearing assembly LH) · Sensor installation · Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
C1277	Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC)	Detected only during Test Mode.	Rear speed sensor rotor RH (rear axle hub and bearing assembly RH)
C1278	Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC)	Detected only during Test Mode.	Rear speed sensor rotor LH (rear axle hub and bearing assembly LH)
C1415	Rear 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.	· Rear speed sensor RH (rear axle hub and bearing assembly RH) · Speed sensor circuit · Sensor installation · Rear speed sensor rotor RH (rear axle hub and bearing assembly RH) · Skid control ECU (brake actuator assembly)
C1416	Rear 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.	· Rear speed sensor LH (rear axle hub and bearing assembly LH) · Speed sensor circuit · Sensor installation · Rear speed sensor rotor LH (rear axle hub and bearing assembly LH) · Skid control ECU (brake actuator assembly)

HINT:: for C1415 and C1416: 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 C1415 is for the rear speed sensor RH.

·

DTC C1416 is for the rear speed sensor LH.

WIRING DIAGRAM

5.5,4.042 7.115,4.49 1.615,0.448 10 false Skid Control ECU (Brake Actuator Assembly) 5.51,3.875 5.969,4.073 0.458,0.198 10 false A48 1.354,3.688 2.615,4.104 1.26,0.417 10 false Skid Control Sensor Wire LH 0.365,1.625 1.104,1.979 0.74,0.354 10 false Rear Speed Sensor RH 0.375,3.667 1.115,4.063 0.74,0.396 10 false Rear Speed Sensor LH 0.75,0.625 1.104,0.875 0.354,0.25 10 false RR+ 0.76,1.208 1.094,1.427 0.333,0.219 10 false RR- 1.948,0.625 2.333,0.917 0.385,0.292 10 false RR+ 1.563,0.625 2.021,0.823 0.458,0.198 10 false RR+ 1.563,1.198 1.917,1.417 0.354,0.219 10 false RR- 1.958,1.208 2.25,1.438 0.292,0.229 10 false RR- 2.427,0.417 2.583,0.615 0.156,0.198 10 false 1 1.26,0.417 1.417,0.615 0.156,0.198 10 false 2 1.26,0.99 1.417,1.188 0.156,0.198 10 false 1 2.427,0.99 2.583,1.188 0.156,0.198 10 false 2 1.24,0.625 1.51,0.813 0.271,0.188 10 false h1 2.365,0.625 2.771,0.865 0.406,0.24 10 false hL1 0.76,2.667 1.125,2.896 0.365,0.229 10 false RL+ 1.583,2.656 2.042,2.854 0.458,0.198 10 false RL+ 1.958,2.656 2.323,2.917 0.365,0.26 10 false RL+ 0.76,3.25 1.083,3.5 0.323,0.25 10 false RL- 1.583,3.24 1.833,3.5 0.25,0.26 10 false RL- 1.958,3.24 2.25,3.5 0.292,0.26 10 false RL- 1.26,2.635 1.5,2.833 0.24,0.198 10 false j1 1.25,2.438 1.406,2.635 0.156,0.198 10 false 2 2.427,2.438 2.583,2.635 0.156,0.198 10 false 1 2.396,2.635 2.729,2.833 0.333,0.198 10 false jL1 1.25,3.01 1.406,3.208 0.156,0.198 10 false 1 2.417,3.021 2.573,3.219 0.156,0.198 10 false 2 5.688,0.521 6,0.719 0.313,0.198 10 false 17 5.688,1.083 6,1.281 0.313,0.198 10 false 16 6,0.625 6.458,0.823 0.458,0.198 10 false RR+ 6,1.188 6.458,1.385 0.458,0.198 10 false RR- 6,2.656 6.458,2.854 0.458,0.198 10 false RL+ 6,3.219 6.458,3.417 0.458,0.198 10 false RL- 5.75,2.552 6.063,2.75 0.313,0.198 10 false 5 5.75,3.115 6.063,3.313 0.313,0.198 10 false 4 1.24,1.208 1.51,1.396 0.271,0.188 10 false h1 1.323,1.635 2.573,2.073 1.25,0.438 10 false Skid Control Sensor Wire RH 2.365,1.208 2.771,1.448 0.406,0.24 10 false hL1 2.396,3.219 2.729,3.417 0.333,0.198 10 false jL1 1.26,3.219 1.5,3.417 0.24,0.198 10 false j1

PROCEDURE

1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

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
RR Speed Open	Rear speed sensor RH open detection	Error or Normal	Error: Momentary interruption Normal: Normal	-
RL Speed Open	Rear speed sensor LH open detection	Error or Normal	Error: Momentary interruption Normal: Normal	-

Chassis > ABS/VSC/TRC > Data List

Tester Display
RR Speed Open
RL Speed Open

50003 105 202,203

OK:: There are no momentary interruptions.

HINT:: Perform the above inspection before removing the sensor and connector.

Result:

Proceed to
OK
NG

2.READ VALUE USING GTS (REAR SPEED SENSOR)

4.CHECK REAR SPEED SENSOR INSTALLATION

2.READ VALUE USING GTS (REAR SPEED SENSOR)

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
RR Wheel Speed	Rear 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
RL Wheel Speed	Rear 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
RR Wheel Speed
RL Wheel Speed

50003 105 3,4

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

3.RECONFIRM DTC

4.CHECK REAR SPEED SENSOR INSTALLATION

3.RECONFIRM DTC

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 C1415 and C1416 are not output.	A
DTCs C1415 and/or C1416 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

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING

REPLACE BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL

4.CHECK REAR SPEED SENSOR INSTALLATION

0.99,0.438 1.281,0.219 false 0.927,1.708 1.24,1.906 0.313,0.198 10 *a 2.344,1.698 2.656,1.896 0.313,0.198 10 *b 0.073,0.052 0.385,0.25 0.313,0.198 10 *1 1.344,0.104 1.656,0.302 0.313,0.198 10 *c

*1	Rear Speed Sensor
*a	Correct
*b	Incorrect
*c	No clearance

Turn the ignition switch off.

Check the speed sensor installation.

OK:: There is no clearance between the sensor and rear axle carrier.

Result:

Proceed to
OK
NG

5.INSPECT SKID CONTROL SENSOR WIRE

INSTALL REAR SPEED SENSOR CORRECTLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>REAR SPEED SENSOR>INSTALLATION

5.INSPECT SKID CONTROL SENSOR WIRE

0.208,2.542 0.563,2.792 0.354,0.25 0.198,0.615 0.552,0.865 0.354,0.25 1.844,0.635 2.198,0.885 0.354,0.25 1.927,2.677 2.281,2.927 0.354,0.25 0.604,1.958 0.948,1.26 false 1.417,1.938 1.198,1.26 false 2.698,1.958 2.646,1.542 false 2.24,1.958 2.333,1.521 false 2.281,4.104 2.344,3.615 false 2.698,4.125 2.625,3.594 false 0.688,4.094 0.948,3.344 false 1.406,4.135 1.198,3.344 false 0.156,0.094 0.469,0.292 0.313,0.198 10 false *a 0.167,0.323 0.479,0.521 0.313,0.198 10 false *A 0.208,2.271 0.521,2.469 0.313,0.198 10 false *B 0.344,2.583 0.656,2.781 0.313,0.198 10 false j1 0.302,0.656 0.615,0.854 0.313,0.198 10 false h1 1.917,0.677 2.385,0.938 0.469,0.26 10 false hL1 2.021,2.719 2.333,2.917 0.313,0.198 10 false jL1 0.99,0.479 1.302,0.677 0.313,0.198 10 false *b 2.396,0.74 2.708,0.938 0.313,0.198 10 false *c 2.396,2.813 2.708,3.01 0.313,0.198 10 false *c 0.969,2.583 1.281,2.781 0.313,0.198 10 false *b 0.479,1.979 0.792,2.177 0.313,0.198 10 false RR- 1.323,1.979 1.635,2.177 0.313,0.198 10 false RR+ 2.115,1.969 2.427,2.167 0.313,0.198 10 false RR+ 2.604,1.979 2.917,2.177 0.313,0.198 10 false RR- 0.594,4.125 0.906,4.323 0.313,0.198 10 false RL- 1.292,4.135 1.604,4.333 0.313,0.198 10 false RL+ 2.156,4.125 2.469,4.323 0.313,0.198 10 false RL+ 2.583,4.125 2.896,4.323 0.313,0.198 10 false RL-

*A	RH
*B	LH
*a	Front view of Skid Control Sensor Wire
*b	Front view of wire harness connector (to Sensor Side Connector)
*c	Front view of wire harness connector (to Vehicle Side Connector)

Turn the ignition switch off.

Make sure that there is no looseness at the locking part and the connecting part of the connectors.

Remove the skid control sensor wire.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RH
Tester Connection	Condition	Specified Condition
h1-2 (RR+) - hL1-1 (RR+)	Always	Below 1 Ω
h1-2 (RR+) - hL1-2 (RR-)	Always	10 kΩ or higher
h1-2 (RR+) or hL1-1 (RR+) - Body ground	Always	10 kΩ or higher
h1-1 (RR-) - hL1-2 (RR-)	Always	Below 1 Ω
h1-1 (RR-) - hL1-1 (RR+)	Always	10 kΩ or higher
h1-1 (RR-) or hL1-2 (RR-) - Body ground	Always	10 kΩ or higher

for LH
Tester Connection	Condition	Specified Condition
j1-2 (RL+) - jL1-1 (RL+)	Always	Below 1 Ω
j1-2 (RL+) - jL1-2 (RL-)	Always	10 kΩ or higher
j1-2 (RL+) or jL1-1 (RL+) - Body ground	Always	10 kΩ or higher
j1-1 (RL-) - jL1-2 (RL-)	Always	Below 1 Ω
j1-1 (RL-) - jL1-1 (RL+)	Always	10 kΩ or higher
j1-1 (RL-) or jL1-2 (RL-) - Body ground	Always	10 kΩ or higher

NOTICE:: Check the speed sensor signal after replacement.; Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>TEST MODE PROCEDURE

Result:

Proceed to
OK
NG

6.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE)

REPLACE SKID CONTROL SENSOR WIRE

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>REAR SPEED SENSOR>REMOVAL

6.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - SKID CONTROL SENSOR WIRE)

Make sure that there is no looseness at the locking part and the connecting part of the connector.

Disconnect the A48 skid control ECU (brake actuator assembly) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RH
Tester Connection	Condition	Specified Condition
A48-17 (RR+) - hL1-1 (RR+)	Always	Below 1 Ω
A48-17 (RR+) or hL1-1 (RR+) - Body ground	Always	10 kΩ or higher
A48-16 (RR-) - hL1-2 (RR-)	Always	Below 1 Ω
A48-16 (RR-) or hL1-2 (RR-) - Body ground	Always	10 kΩ or higher

for LH
Tester Connection	Condition	Specified Condition
A48-5 (RL+) - jL1-1 (RL+)	Always	Below 1 Ω
A48-5 (RL+) or jL1-1 (RL+) - Body ground	Always	10 kΩ or higher
A48-4 (RL-) - jL1-2 (RL-)	Always	Below 1 Ω
A48-4 (RL-) or jL1-2 (RL-) - Body ground	Always	10 kΩ or higher

Result:

Proceed to
OK
NG

7.INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR INPUT)

0.313,0.948 0.792,1.25 0.479,0.302 1.76,0.948 2.24,1.25 0.479,0.302 1.125,2.042 1.354,2.521 false 2.521,2.042 2.896,2.521 false 0.396,0.292 0.635,0.469 0.24,0.177 10 *a 1.281,2.563 1.885,2.875 0.604,0.313 10 RR+ 2.76,2.542 3.292,2.833 0.531,0.292 10 RL+ 0.448,1.021 0.938,1.323 0.49,0.302 10 hL1 1.917,1.01 2.365,1.344 0.448,0.333 10 jL1

*a	Front view of wire harness connector (to Skid Control Sensor Wire)

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
hL1-1 (RR+) - Body ground	Ignition switch ON	5.7 to 14 V

for LH
Tester Connection	Condition	Specified Condition
jL1-1 (RL+) - 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:: ·

The rear speed sensor rotor and rear speed sensor are incorporated into the rear axle hub and bearing assembly.

If the rear speed sensor rotor needs to be replaced, replace the rear axle hub and bearing assembly with rear speed sensor.

·

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

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY WITH REAR SPEED SENSOR

Click hereDrivetrain>AXLE AND DIFFERENTIAL>REAR AXLE HUB>REMOVAL

REPLACE BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL