ECM receive vehicle speed signal from ABS/ESP (HECU, Hydraulic Electrical Control Unit) module. HECU calculates vehicle speed after receiving 4 wheel speed signal from each wheel. Then, it sends vehicle speed signal to ECM, cluster, air conditioner control module, and BCM etc. through CAN communication. If more than one of wheel speed sensor on the rear if failed, it is calculated as vehicle speed signals from 2 wheel speed sensor on the front.
DTC P0501 is set when the vehicle from the HECU to ECM through the CAN communication line is abnormal. If the DTC is retrieved, check system fault on wheel speed sensors or system error then, check circuit related CAN communication line between ECM an HECU.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal monitoring
Vehicle speed sensor circuit
Vehicle speed sensor component
Enable Conditions
Engine running
Threshold Value
Invalid signal from ABS/ESP module via CAN communication is detected.
Diagnostic Time
Immediately
Fail Safe
Fuel cut
NO
2kph at fail safe mode.
EGR Off
Fuel Limit
Check Lamp
OFF
EMS
TCU
ABS
VDC
EPS
TPMS
Cluster
VGT
Air bag
4WD
IPM
CAN HIGH
68
87
6
14
3
5
2
30
10
CAN LOW
67
65
13
15
4
1
20