C1405

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1405, C1406: Open or Short in Front Speed Sensor RH Circuit
C1406 - Open or Short in Front Speed Sensor LH Circuit

DESCRIPTION

Refer to DTCs C1401 and C1402 C1271.





HINT
* DTC C1405 is for the front speed sensor RH.
* DTC C1406 is for the front speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When replacing the master cylinder solenoid, perform calibration Calibration.
* Check the speed sensor signal after replacement Test Mode Procedure.

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 the DTC Check For Intermittent Problems.

ABS/VSC/TRAC





OK:

Normal (there are no momentary interruptions).

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

NG -- INSPECT SKID CONTROL SENSOR WIRE
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) C1271

NG -- INSPECT SKID CONTROL SENSOR WIRE
OK -- Continue to next step.

3. 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 40 km/h (25 mph) or more for at least 60 seconds.

(e) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- REPLACE MASTER CYLINDER SOLENOID Disassembly

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

4. INSPECT SKID CONTROL SENSOR WIRE

(a) Remove the skid control sensor wire.

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





Standard Resistance:

for RH





for LH





Text in Illustration





NG -- REPLACE SKID CONTROL SENSOR WIRE
OK -- Continue to next step.

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

(a) Install the skid control sensor wire.

(b) Disconnect the A4 skid control ECU connector.

(c) Disconnect the V1 and/or W1 front speed sensor connector.

(d) 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.

6. INSPECT SKID CONTROL ECU (FR+, FL+ TERMINAL)

(a) Disconnect the V1 and/or W1 front speed sensor connector.

(b) Connect the A4 skid control ECU connector.

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





Standard Voltage:

for RH





for LH





Text in Illustration





NG -- REPLACE MASTER CYLINDER SOLENOID Disassembly

OK -- REPLACE FRONT SPEED SENSOR Removal