Low Output Signal of Front Speed Sensor RH (Test Mode DTC) - ABS (Antilock Brake System)

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ANTI-LOCK BRAKE SYSTEM: C0200/31,C0205/32,C1271/71,C1272/72: Front Speed Sensor RH Circuit
C1272/72 - Low Output Signal of Front Speed Sensor LH (Test Mode DTC)

DESCRIPTION

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system.

Speed sensor rotors have 48 serrations. The hall IC type speed sensor use the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect vehicle speeds even when the vehicle is nearly stationary.

DTCs C1271/71 and C1272/72 will be deleted when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1271/71 and C1272/72 are output only in Test Mode.

HINT
* DTCs C0200/31 and C1271/71 are for the front speed sensor RH.
* DTCs C0205/32 and C1272/72 are for the front speed sensor LH.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

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

ABS/VSC/TRAC

ABS/VSC/TRAC:

Result:

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

C -- CHECK FRONT SPEED SENSOR INSTALLATION

B -- READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR)
A -- Continue to next step.

2. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)

(a) Turn the ignition switch off.

(b) Repair or replace the harness or connector.

(c) Check for any momentary interruptions between the skid control ECU and front speed sensor Check for Intermittent Problems.

(d) Check that there are no momentary interruptions.

NEXT -- Continue to next step.

3. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs ABS (Antilock Brake System).

(c) Start the engine.

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

(e) Check if the same DTC is recorded ABS (Antilock Brake System).

Result:

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 On-Vehicle inspection.

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 FRONT SPEED SENSOR INSTALLATION
OK -- Continue to next step.

5. PERFORM TEST MODE (SIGNAL CHECK)

(a) Turn the ignition switch off.

(b) Perform the sensor check in the Test Mode procedure Test Mode Procedure.

OK:

All Test Mode DTCs are cleared.

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

6. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs ABS (Antilock Brake System).

(c) Start the engine.

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

(e) Check if the same DTC is recorded ABS (Antilock Brake System).

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 ABS (Antilock Brake System).

B -- REPLACE FRONT SPEED SENSOR

A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System

7. CHECK FRONT SPEED SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check the speed sensor installation.

OK:

There is no clearance between the sensor and the front steering knuckle.

The installation nut is tightened properly.

Torque
8.5 N*m (87 kgf*cm, 75 in.*lbf)

NG -- INSTALL FRONT SPEED SENSOR CORRECTLY Installation
OK -- Continue to next step.

8. CHECK FRONT SPEED SENSOR TIP

(a) Remove the front speed sensor Removal.

(b) Check the speed sensor tip.

OK:

No scratches or foreign matter on the sensor tip.

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

NG -- CLEAN OR REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.

9. INSPECT FRONT SPEED SENSOR

(a) Install the front speed sensor.

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

(c) Disconnect the front speed sensor connector.

(d) 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 FRONT SPEED SENSOR Removal
OK -- Continue to next step.

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

(a) Disconnect the skid control ECU connector.

(b) 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. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Reconnect the front speed sensor connector.

(c) Clear the DTCs ABS (Antilock Brake System).

(d) Start the engine.

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

(f) Check if the same DTC is recorded ABS (Antilock Brake System).

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 ABS (Antilock Brake System).

B -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Diagnosis System
A -- Continue to next step.

13. REPLACE FRONT SPEED SENSOR

(a) Turn the ignition switch off.

(b) Replace the front speed sensor Removal.

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

NEXT -- Continue to next step.

14. RECONFIRM DTC

(a) Clear the DTCs ABS (Antilock Brake System).

(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 ABS (Antilock Brake System).

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 ABS (Antilock Brake System).

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

15. REPLACE FRONT SPEED SENSOR ROTOR

(a) Turn the ignition switch off.

(b) Remove the front drive shaft assembly Removal.

(c) Replace the front axle outboard joint shaft assembly (front speed sensor rotor) Disassembly.

HINT
If the front speed sensor rotor needs to be replaced, replace it together with the front axle outboard joint shaft assembly.

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

NEXT -- Continue to next step.

16. RECONFIRM DTC

(a) Install the front drive shaft assembly.

(b) Clear the DTCs ABS (Antilock Brake System).

(c) Start the engine.

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

(e) Check if the same DTC is recorded ABS (Antilock Brake System).

Result: