C1273
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1273, C1274, C1332, C1333, C1466, C1467: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
C1467 - Rear Speed Sensor LH
DESCRIPTION
Each speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. These signals are used by the ABS control system.
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 and C1274 are cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs C1273 and C1274 are output only in Test Mode.
*1: If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 15% is allowable.
*2: If the speed of any wheel is less than 5 km/h (3 mph), a speed difference of up to 16 km/h (10 mph) is allowable.
HINT
* DTCs C1273, C1332 and C1466 are for the rear speed sensor RH.
* DTCs C1274, C1333 and C1467 are for the rear speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Select the Data List using the Techstream Data List / Active Test.
ABS/VSC/TRAC
(d) Check the speed value output from the speed sensor displayed on the Techstream.
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 On-Vehicle Inspection.
OK:
The speed value output from the speed sensor displayed on the Techstream is similar to the speed indicated on the speedometer.
NG -- CHECK REAR SPEED SENSOR INSTALLATION
OK -- Continue to next step.
2. PERFORM TEST MODE INSPECTION (SIGNAL CHECK)
(a) Turn the ignition switch off.
(b) Perform the sensor check using the Test Mode procedure Test Mode Procedure.
OK:
All Test Mode DTCs are not output.
NG -- CHECK REAR SPEED SENSOR INSTALLATION
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Turn the ignition switch off.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Turn the ignition switch off.
(d) Start the engine.
(e) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.
(f) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- REPLACE REAR AXLE HUB AND BEARING ASSEMBLY
A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting
4. CHECK REAR SPEED SENSOR INSTALLATION
(a) Turn the ignition switch off.
(b) Check the speed sensor installation.
OK:
There is no clearance between the sensor and rear axle carrier.
NG -- INSTALL REAR SPEED SENSOR CORRECTLY Installation
OK -- Continue to next step.
5. INSPECT SKID CONTROL SENSOR WIRE
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(b) Remove the skid control sensor wire.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
Text in Illustration
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NG -- REPLACE SKID CONTROL SENSOR WIRE Removal
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL SENSOR WIRE)
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(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.
7. RECONFIRM DTC
(a) Install the skid control sensor wire.
(b) Reconnect the skid control ECU connector.
(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(d) Turn the ignition switch off.
(e) Start the engine.
(f) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.
(g) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting
A -- Continue to next step.
8. REPLACE REAR AXLE HUB AND BEARING ASSEMBLY
(a) Turn the ignition switch off.
(b) Replace the rear speed sensor rotor with rear speed sensor (rear axle hub and bearing assembly) Removal.
HINT
The rear speed sensor rotor is 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.
NOTICE:
Check the speed sensor signal after replacement Test Mode Procedure.
NEXT -- Continue to next step.
9. RECONFIRM DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Drive the vehicle at a speed of 45 km/h (28 mph) or more for at least 120 seconds.
(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.
Result:
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 Problem Symptoms Table.
B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
A -- END