BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ VSC OFF Switch) C050012 Left Front Wheel Speed Sensor Circuit Short to Battery C050612 Right Front Wheel Speed Sensor Circuit Short to Battery
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 and VSC 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 |
|---|---|---|---|
| C050012 | Left Front 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. | ·
Front speed sensor LH ·
Wire harness or connector ·
Skid control ECU (brake actuator assembly) |
| C050612 | Right Front 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. | ·
Front speed sensor RH ·
Wire harness or connector ·
Skid control ECU (brake actuator assembly) |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
- ·
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
·After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
PROCEDURE
| *A | for LH |
| *B | for RH |
| *a | Front view of wire harness connector
(to Front Speed Sensor) |
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
- OK:
The connector is securely connected.
Disconnect the A58 or A57 front speed sensor connector.
Check both the connector case and the terminals for deformation and corrosion.
- OK:
No deformation or corrosion.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for LH Tester Connection Condition Specified Condition A57-2 (FL+) - A57-1 (FL-) Ignition switch ON 11 to 14 V
for RH Tester Connection Condition Specified Condition A58-2 (FR+) - A58-1 (FR-) Ignition switch ON 11 to 14 V
- Result:
Proceed to OK NG
OK
NG
| *A | for LH |
| *B | for RH |
| *a | Front view of wire harness connector
(to Front Speed Sensor) |
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
- OK:
The connector is securely connected.
Disconnect the A28 skid control ECU (brake actuator assembly) connector.
Disconnect the A58 or A57 front speed sensor connector.
Check both the connector case and the terminals for deformation and corrosion.
- OK:
No deformation or corrosion.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for LH Tester Connection Condition Specified Condition A57-1 (FL-) - Body ground Always Below 1.5 V
for RH Tester Connection Condition Specified Condition A58-1 (FR-) - Body ground Always Below 1.5 V
- Result:
Proceed to OK NG
OK
NG
Make sure that there is no looseness at the locking part and the connecting part of the connectors.
- OK:
The connector is securely connected.
Disconnect the A28 skid control ECU (brake actuator assembly) connector.
Disconnect the A58 or A57 front speed sensor connector.
Check both the connector case and the terminals for deformation and corrosion.
- OK:
No deformation or corrosion.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LH Tester Connection Condition Specified Condition A57-2 (FL+) or A28-19 (FL+) - A57-1 (FL-) or A28-8 (FL-) Always 10 kΩ or higher
for RH Tester Connection Condition Specified Condition A58-2 (FR+) or A28-16 (FR+) - A58-1 (FR-) or A28-4 (FR-) Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG