C1407

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1407,C1408: Open or Short in Rear Speed Sensor RH Circuit


DESCRIPTION

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

The speed sensor rotors have rows of alternating N and S magnetic poles and their magnetic fields change when the rotors turn.

Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU.









HINT
- DTC C1407 is for the rear speed sensor RH.
- DTC C1408 is for the rear speed sensor LH.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the master cylinder solenoid, perform calibration Programming and Relearning.
- 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 (REAR SPEED SENSOR) C1403

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

3. RECONFIRM DTC

(a) Turn the engine switch off.

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

(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





Text in Illustration





(a) Remove the skid control sensor wire Removal.

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

Standard Resistance:

for RH





for LH





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

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

(a) Install the skid control sensor wire.

(b) Disconnect the A7 skid control ECU connector.

(c) Disconnect the q1 and/or q2 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. CHECK TERMINAL VOLTAGE (RR+, RL+)

(a) Disconnect the q1 and/or q2 speed sensor connector.

(b) Connect the A7 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 REAR SPEED SENSOR Removal