C1405

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM (for Hatchback): C1405: Open or Short in Front Speed Sensor RH Circuit

DTC C1405 - Open or Short in Front Speed Sensor RH Circuit

DTC C1406 - Open or Short in Front Speed Sensor LH Circuit

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.









HINT:
- DTCs C1271 and C1272 are output only in the Test Mode.
- DTCs C1271 and C1272 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends.
- DTCs C1405 and C1271 are for the front speed sensor RH.
- DTCs C1406 and C1272 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 interruption in the wire harness and connector corresponding to a DTC Check For Intermittent Problems.

ABS/VSC/TRC





OK:
There are no momentary interruptions
HINT: Perform the above inspection before removing the sensor and connector.

NG -- CHECK IF SKID CONTROL ECU AND FRONT SPEED SENSOR CONNECTORS ARE SECURELY CONNECTED
OK -- Continue to next step.
2. RECONFIRM DTC
(a) Clear the DTC ABS (Antilock Brake System) (for Hatchback).
(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) (for Hatchback).

Result





B -- REPLACE FRONT SPEED SENSOR
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
3. CHECK IF SKID CONTROL ECU AND FRONT SPEED SENSOR CONNECTORS ARE SECURELY CONNECTED
(a) Check if the skid control ECU and the front speed sensor connectors are securely connected.
NEXT -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTC ABS (Antilock Brake System) (for Hatchback).
(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) (for Hatchback).

Result





B -- END
A -- Continue to next step.
5. INSPECT FRONT SPEED SENSOR




(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(b) Disconnect the front speed sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH





for LH





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

NG -- REPLACE FRONT SPEED SENSOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR)




(a) Disconnect the skid control ECU connector.
(b) Inspect both the connector case and the terminal for deformation and corrosion.
OK:
No deformation or corrosion.
(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. 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
OK -- Continue to next step.
8. REPLACE FRONT SPEED SENSOR
(a) Turn the ignition switch off.
(b) Replace the front speed sensor Removal.
NOTE: Check the speed sensor signal after cleaning or replacement Test Mode Procedure.

NEXT -- Continue to next step.
9. RECONFIRM DTC
(a) Clear the DTC ABS (Antilock Brake System) (for Hatchback).
(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) (for Hatchback).

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
A -- END