DTC 33

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0210/33, C0215/34, C1273/73, C1274/74: Rear Speed Sensor RH Circuit
C1274/74 - Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensors detect the wheel speeds and send appropriate signals to the skid control ECU. Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change as the rotors turn.

The speed sensors detect those magnetic changes and send pulse signals to the skid control ECU. The ECU monitors the wheel speeds through these pulse signals to control the ABS control system.

DTCs C1273/73 and C1274/74 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1273/73 and C1274/74 are output only in the Test Mode.





HINT
When testing voltage, perform the test while the connector between the sensor and ECU is connected. Do not disconnect the connector between the sensor and ECU.





HINT
* DTCs C0210/33 and C1273/73 are for the rear speed sensor RH.
* DTCs C0215/34 and C1274/74 are for the rear speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Disassembly of the rear speed sensor from the rear axle hub and bearing assembly is prohibited.
* When replacing the brake actuator assembly, perform zero point calibration Programming and Relearning.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to a DTC Check for Intermittent Problems.

ABS/VSC/TRAC:





OK:

There are no momentary interruptions.

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

NG -- CHECK IF SKID CONTROL ECU AND REAR SPEED SENSOR CONNECTOR ARE SECURELY CONNECTED
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)

(a) Turn the ignition switch to OFF.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(d) Select the Data List mode on the Techstream Data List / Active Test.

ABS/VSC/TRAC:





(e) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.

HINT
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 Component Tests and General Diagnostics.

OK:

The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).

NG -- CHECK REAR SPEED SENSOR INSTALLATION
OK -- Continue to next step.

3. PERFORM TEST MODE (SIGNAL CHECK)

(a) Perform sensor check in Test Mode procedure Test Mode Procedure.

OK:

All Test Mode DTCs are erased.

NG -- CHECK REAR SPEED SENSOR INSTALLATION
OK -- Continue to next step.

4. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR)

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Check for Intermittent Problems

5. CHECK IF SKID CONTROL ECU AND REAR SPEED SENSOR CONNECTOR ARE SECURELY CONNECTED

(a) Check if the skid control ECU and the rear speed sensor connectors are securely connected.

NEXT -- Continue to next step.

6. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- END
A -- Continue to next step.

7. CHECK REAR SPEED SENSOR INSTALLATION

(a) Turn the ignition switch to OFF.





(b) Check the speed sensor installation.

OK:

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

NG -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR) Removal
OK -- Continue to next step.

8. INSPECT REAR SPEED SENSOR

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





(b) Disconnect the rear speed sensor connector.

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

Standard resistance:

for RH
for LH










NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.

HINT
Because the rear axle hub and bearing assembly cannot be disassembled. if the rear speed sensor needs replacement, replace the rear axle hub and bearing assembly.

NG -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR) Removal
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (SPEED SENSOR WIRE)

(a) Disconnect the speed sensor wire.





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

Standard resistance:

for RH
for LH










NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.

NG -- REPLACE SPEED SENSOR WIRE
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR)

(a) Reconnect the speed sensor wire.





(b) Disconnect the skid control ECU connector.

(c) 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 -- Continue to next step.

11. INSPECT SKID CONTROL ECU (SENSOR INPUT)

(a) Reconnect the skid control ECU connector.





(b) Turn the ignition switch to ON.

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

Standard voltage:

for RH
for LH










NG -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
OK -- Continue to next step.

12. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY (REAR SPEED SENSOR AND REAR SPEED SENSOR ROTOR)

(a) Turn the ignition switch to OFF.

(b) Replace the rear speed sensor and rear axle hub and bearing assembly Removal.

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

Because the rear axle hub and bearing assembly cannot be disassembled. if the rear speed sensor needs replacement, replace the rear axle hub and bearing assembly.

NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.

NEXT -- Continue to next step.

13. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.

(d) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Problem Symptoms Table.

B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

A -- END