BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/o VSC OFF Switch) C050C12 Left Rear Wheel Speed Sensor Circuit Short to Battery C051212 Right Rear 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 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.
- HINT:
-
The following example shows a pulse signal that is output when the wire harness connectors are connected to the speed sensors and skid control ECU (brake actuator assembly).
| 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 RH (rear speed sensor) ·
Wire harness or connector ·
Skid control ECU (brake actuator assembly) |
| C051212 | Right 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 (rear speed sensor) ·
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 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 Rear 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 X1 rear 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 X1-4 (RL+) - X1-3 (RL-) Ignition switch ON 11 to 14 V
for RH Tester Connection Condition Specified Condition X1-2 (RR+) - X1-1 (RR-) 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 Rear 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 X1 rear 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 X1-3 (RL-) - Body ground Always Below 1.5 V
for RH Tester Connection Condition Specified Condition X1-1 (RR-) - 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 X1 rear 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 X1-4 (RL+) or A28-31 (RL+) - X1-3 (RL-) or A28-18 (RL-) Always 10 kΩ or higher
for RH Tester Connection Condition Specified Condition X1-2 (RR+) or A28-17 (RR+) - X1-1 (RR-) or A28-29 (RR-) Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG