Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Left Rear Wheel Speed Sensor Circuit Short to Battery (C050C12)

DESCRIPTION

Each speed sensor detects wheel speed and sends signals to the skid control ECU (brake actuator assembly). These signals are used by the ABS control.

The speed sensor detects the magnetic fields of the speed sensor rotor as it rotates and outputs a pulse signal.

The frequency of the pulse varies in accordance with the rotational speed of the speed sensor rotor and the system uses this to determine the wheel speed.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050C12

Left Rear Wheel Speed Sensor Circuit Short to Battery

A short to +B in the speed sensor signal circuit is detected for 0.12 seconds or more.

  • Rear speed sensor LH*1
  • Rear speed sensor LH (rear axle hub and bearing assembly LH)*2
  • Wire harness or connector
  • Skid control sensor wire LH (No. 2 parking brake wire assembly)
  • Skid control ECU (brake actuator assembly)
  • *1: for AWD
  • *2: for 2WD

WIRING DIAGRAM

for 2WD for AWD

PROCEDURE

1.

CHECK VEHICLE

(a) Check the vehicle specification.

Result

Proceed to

for 2WD

A

for AWD

B

B

GO TO STEP 6

A

2.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

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

OK:

The connector is securely connected.

*a

Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)

(to Rear Speed Sensor LH (Rear Axle Hub and Bearing Assembly LH))

(b) Disconnect the n3 rear speed sensor LH (rear axle hub and bearing assembly LH) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

n3-2 (RL+) - n3-1 (RL-)

Ignition switch ON

11 to 14 V

OK

REPLACE REAR AXLE HUB AND BEARING ASSEMBLY LH

NG

3.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly))

(b) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

nO2-2 (RL+) - nO2-1 (RL-)

Ignition switch ON

11 to 14 V

OK

REPLACE NO. 2 PARKING BRAKE WIRE ASSEMBLY

NG

4.

CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

*a

Front view of wire harness connector

(to Skid Control Sensor Wire LH (No. 2 Parking Brake Wire Assembly))

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

nO2-1 (RL-) - Body ground

Always

Below 1.5 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (NO. 2 PARKING BRAKE WIRE ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A151 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the nO2 skid control sensor wire LH (No. 2 parking brake wire assembly) connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

nO2-2 (RL+) or A151-39 (RL+) - nO2-1 (RL-) or A151-23 (RL-)

Always

10 kΩ or higher

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

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

OK:

The connector is securely connected.

*a

Front view of skid control sensor wire LH (No. 2 parking brake wire assembly)

(to Rear Speed Sensor LH)

(b) Disconnect the n4 rear speed sensor LH connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

n4-1 (RL+) - n4-2 (RL-)

Ignition switch ON

11 to 14 V

OK

REPLACE REAR SPEED SENSOR LH

NG

GO TO STEP 3

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