P1721
DTC P1721 VEHICLE SPEED SENSOR MTRDescription
The vehicle speed sensor-MTR signal is transmitted from combination meter to TCM by CAN communication line. The signal functions as an auxiliary device to the revolution sensor when it is malfunctioning. The TCM will then use the vehicle speed sensor-MTR signal.
On Board Diagnosis Logic
^ This is not an OBD-II self-diagnostic item.
^ Diagnostic trouble code VHE SPD SE-MTR" with CONSULT-II is detected when TCM does not receive the proper vehicle speed sensor MTR signal (input by CAN communication) from combination meter.
Possible Cause
Harness or connectors (The sensor circuit is open or shorted.)
DTC Confirmation Procedure
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.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch to "ON" position. (Do not start engine.)
2. Select "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Start engine and maintain the following conditions for at least 5 consecutive seconds. ACCELE POS: 1/8 or less VHCL SPEED SE: 30 km/h (17 MPH) or more
4. If DTC is detected, go to "Diagnostic Procedure".
Diagnostic Procedure
1. CHECK INPUT SIGNALS (WITH CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. Drive vehicle and read out the value of "VHCL/S SE-MTR".
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
2. CHECK DTC, STEP 1
Check following items.
1. Refer to "DTC U1000 CAN COMMUNICATION LINE".
2. Refer to "CONSULT-II Functions".
3. Refer to "COMBINATION METERS".
OK or NG
OK >> INSPECTION END
NG >> If NG, recheck pin terminals for damage or loose connection with harness connector.
3. CHECK DTC, STEP 2
Perform DTC confirmation procedure.
OK or NG
OK >> INSPECTION END
NG >> If the system returns a malfunction, recheck pin terminals for damage or loose connection with harness connector.