P1721

P1721 VEHICLE SPEED SIGNAL

Description

The vehicle speed signal is transmitted from unified meter and A/C amp. to TCM via CAN communication line.
The signal functions as an auxiliary device to the output speed sensor when it is malfunctioning. The TCM will then use the vehicle speed signal.


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


CAUTION:
- Always drive vehicle at a safe speed.
- Be careful not to rev engine into the red zone on the tachometer.

1. PRECONDITIONING

If "DTC CONFIRMATION PROCEDURE" is previously conducted, always turn ignition switch OFF and wait at least 10 seconds before performing the next test.
- GO TO 2.

2. CHECK DTC DETECTION

With CONSULT
1.Start the engine.
2.Select "ESTM VSP SIG" in "Data Monitor" in "TRANSMISSION".
3.Drive vehicle and maintain the following conditions for 60 seconds or more.





4.Perform "Self Diagnostic Results" in "TRANSMISSION".
Is "P1721" detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK DTC OF UNIFIED METER AND A/C AMP.

With CONSULT
Perform "Self Diagnostic Results" in "METER/M&A".
Is any DTC detected?
YES- Check DTC detected item. Refer to "DTC Index" Testing and Inspection.
NO- GO TO 2.

2. CHECK DTC OF TCM

With CONSULT
Perform "Self Diagnostic Results" in "TRANSMISSION".
Is any DTC other than "P1721" detected?
YES- Check DTC detected item. Refer to "DTC Index" Testing and Inspection.
NO- GO TO 3.

3. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace control valve & TCM. Refer to "Removal and Installation" Removal and Installation.
NO- Repair or replace damaged parts.