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-III
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.

ESTM VSP SIG : 40 km/h (25 MPH) or more

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




Diagnosis Procedure
1.CHECK DTC OF UNIFIED METER AND A/C AMP.
With CONSULT-III
Perform "Self Diagnostic Results" in "METER/M&A".
Is any DTC detected?
YES - Check DTC detected item. Testing and Inspection.
NO - GO TO 2.
2.CHECK DTC OF TCM
With CONSULT-III
Perform "Self Diagnostic Results" in "TRANSMISSION".
Is any DTC other than "P1721" detected?
YES - Check DTC detected item. Testing and Inspection.
NO - GO TO 3.
3.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - Replace control valve & TCM. Removal And Installation.
NO - Repair or replace damaged parts.