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DTC P1720 VSS
EC-809
[QR (WITHOUT EURO-OBD)]
C
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EC
DTC P1720 VSS PFP:31036
Description BBS001S1
NOTE:
If DTC P1720 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
EC-635, "
DTC U1000, U1001 CAN COMMUNICATION LINE" .
ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from ESP/TCS/ABS
control unit (models with ESP) or “ABS actuator and electric unit (control unit)”(models without ESP), and the
other is from TCM (Transmission control module). ECM uses these two signals for engine control.
CONSULT-II Reference Value in Data Monitor Mode BBS001S2
Specification data are reference values.
On Board Diagnosis Logic BBS001S3
The MI will not light up for this diagnosis.
DTC Confirmation Procedure BBS001S4
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine.
4. Drive vehicle at a speed of 20 km/h (12 MPH) or more for at least 5 seconds without brake pedal depress-
ing.
5. If 1st trip DTC is detected, go to EC-810, "
Diagnostic Procedure" .
WITHOUT CONSULT-II
1. Start engine.
2. Drive vehicle at a speed of 20 km/h (12 MPH) or more for at least 5 seconds without brake pedal depress-
ing.
3. Stop the vehicle.
4. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
MONITOR ITEM CONDITION SPECIFICATION
VEH SPEED SE
● Turn drive wheels and compare the CONSULT-II value with speedometer
indication
Almost the same speed as the
speedometer indication
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1720
1720
Vehicle speed sensor
(A/T output)
ECM detects a difference between two
vehicle speed sensor signals is out of the
specified range.
● Harness or connectors
(The CAN communication line is open or
shorted)
● Harness or connectors
(Revolution sensor circuit is open or shorted)
● Harness or connectors
(Wheel sensor circuit is open or shorted.)
● TCM
● ESP/TCS/ABS control unit (models with ESP)
● “ABS actuator and electric unit (control unit)”
(models without ESP)
● Combination meter
● Wheel sensor
● Revolution sensor
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