The wheel speed sensor is the essential component that the ECM uses to calculate vehicle speed. This wheel speed sensor is the active hall-sensor type and good at temperature and noise characteristic. Digital wave is produced as tone wheel rotate according as hall sensor principle. Frequency of duty wave is changed in proportion to rotation of tone wheel and ECM gets vehicle speed through ABS/ESP control unit or the wheel speed sensor(In case of non-ABS/ESP vehicle).
If the vehicle speed signal is below 1.0 Km/h during 2 sec under enable conditions, ECM sets P2159.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal check (implausible)
[ABS/ESP Vehicle]
Poor connection
Open or short in signal circuit.
ABS/ESP Module
[Non-ABS/ESP Vehicle]
Open or short in power circuit
Open or short in signal circuit
WSS
Case 1
Enable
Conditions
Engine speed > 3000rpm
Engine load > 50%
Coolant temperature > - 6?
Gear position : D or R
Threshold Value
Vehicle speed signal during fuel injection < 1.0 kph
Case 2
Engine speed : 1520 ~ 3520rpm
Vehicle speed signal during fuel cut-off < 1.0 kph
Diagnostic Time
2 sec.
MIL ON Condition
3 driving cycle