Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Left Front Wheel Speed Sensor Circuit Short to Battery (C050012)

DESCRIPTION

Refer to DTC C05001F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C050012

Left Front Wheel Speed Sensor Circuit Short to Battery

The speed sensor short signal is ON continuously for 0.5 seconds or more.

  • Front speed sensor LH
  • Front skid control sensor wire LH*
  • Wire harness and connector
  • Skid control ECU (brake actuator assembly)

*: w/ AVS

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

    Click here

  • After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.

    Click here

PROCEDURE

1.

CHECK VEHICLE SPECIFICATION

(a) Check the vehicle specification.

Result

Proceed to

w/o AVS

A

w/ AVS

B

B

GO TO STEP 5

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 wire harness connector

(to Front Speed Sensor LH)

(b) Disconnect the A92 front 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 engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A92-3 (FL+) - A92-4 (FL-)

Engine switch on (IG)

11 to 14 V

OK

REPLACE FRONT SPEED SENSOR LH

NG

3.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Front Speed Sensor LH)

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

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

A92-4 (FL-) - Body ground

Always

Below 1.5 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A92-3 (FL+) or A41-22 (FL+) - A92-4 (FL-) or A41-21 (FL-)

Always

10 kΩ or higher

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

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 front skid control sensor wire LH

(to Front Speed Sensor LH)

(b) Disconnect the z14 front 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 engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z14-1 (FL+) - z14-2 (FL-)

Engine switch on (IG)

11 to 14 V

OK

REPLACE FRONT SPEED SENSOR LH

NG

6.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Front Skid Control Sensor Wire LH)

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

OK:

The connector is securely connected.

(c) Disconnect the A90 front skid control sensor wire LH connector.

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

OK:

No deformation or corrosion.

(e) Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A90-3 (FL+) - A90-4 (FL-)

Engine switch on (IG)

11 to 14 V

OK

REPLACE FRONT SKID CONTROL SENSOR WIRE LH

NG

7.

CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT)

(a) Turn the engine switch off.

*a

Front view of wire harness connector

(to Front Skid Control Sensor Wire LH)

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

OK:

The connector is securely connected.

(c) Disconnect the A41 skid control ECU (brake actuator 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

A90-4 (FL-) - Body ground

Always

Below 1.5 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (FRONT SKID CONTROL SENSOR WIRE LH - BRAKE ACTUATOR ASSEMBLY)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A90-3 (FL+) or A41-22 (FL+) - A90-4 (FL-) or A41-21 (FL-)

Always

10 kΩ or higher

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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