DTC C1048: RL wheel speed sensor control phase time exceeded
M13506100028USA0000010000
Wheel Speed Sensor Circuit
ASC-ECU
FRONT
WHEEL
SPEED
SENSOR
(LH)
FRONT
WHEEL
SPEED
SENSOR
(RH)
REAR
WHEEL
SPEED
SENSOR
(LH)
REAR
WHEEL
SPEED
SENSOR
(RH)
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagnosis,
diagnose the CAN bus lines. (Refer to GROUP 54D, Trouble
code diagnosis P.54D-17).
CIRCUIT OPERATION
⦆
The wheel speed sensor is a kind of a pulse generator. It
consists of encoders (a plate on which north and south pole
sides of the magnets are arranged alternately) for detecting
the wheel speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor outputs
frequency pulse signals in proportion to the wheel speed.
⦆
The pulse signals, which the wheel speed sensor creates, are
sent to ASC-ECU. ASC-ECU uses the frequency of the pulse
signals to determine the wheel speed.
DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is
found:
⦆
When the brake fluid pressure is decreased for a long time.
⦆
When the brake fluid pressure is held for a long time.
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-87
DIAGNOSIS