P1721

DTC P1721 VEHICLE SPEED SENSOR MTR

Description
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.

CONSULT-III Reference Value in Data Monitor Mode:

On Board Diagnosis Logic
^ This is not an OBD-II self-diagnostic item.
^ Diagnostic trouble code "P1721 VHE SPD SE-MTR" with CONSULT-III 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 performed, always turn ignition switch "OFF" and wait at least 10 seconds before performing the next test.

After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Turn ignition switch "ON". (Do not start engine.)
2. Select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
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 "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer TM-33, "CONSULT-III Function (TRANSMISSION)". Scan Tool Testing and Procedures
Is a malfunction in the CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to TM-39. U1000
NO >> GO TO 2.

2. CHECK INPUT SIGNAL

With CONSULT-III
1. Start engine.
2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Drive vehicle and read out the value of "VHCL/S SE-MTR".





OK or NG
OK >> GO TO 4.
NG >> GO TO 3.

3. CHECK COMBINATION METERS
Check combination meter. Refer to MWI-4, "Work Flow". Diagnosis and Repair Workflow
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.

4. CHECK DTC
Perform "DTC Confirmation Procedure".
^ Refer to "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 5.

5. CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to TM-93, "Diagnosis Procedure". Main Power Supply and Ground Circuit
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

6. DETECT MALFUNCTIONING ITEM
Check the following items:
^ The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace the control valve with TCM.
NG >> Repair or replace damaged parts.