7AT RE7R01A

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 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. Shift the selector lever to manual shift gate side.
3. Start up in M1, and then upshift to M2.
4. Accelerate to approximately 40 km/h (25 MPH) in M2.
5. Perform "Self Diagnostic Results" in "TRANSMISSION".
Is "P1721" detected?
YES - Go to 7AT RE7R01A.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK DTC OF ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT).
With CONSULT-III
Perform "Self Diagnostic Results" in "ABS".
Is any DTC detected?
YES - Check DTC detected item. Refer to Scan Tool Testing and Procedures.
NO - GO TO 2.
2.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. Refer to Unified Meter and A/C AMP.
NO - GO TO 3.
3.CHECK DTC OF TCM
With CONSULT-III
Perform "Self Diagnostic Results" in "TRANSMISSION".
Is any DTC detected?
YES - Check DTC detected item. Refer to Testing and Inspection.
NO - GO TO 4.
4.CHECK INTERMITTENT INCIDENT
Refer to How to Perform Efficient Diagnosis For an Electrical Incident.
Is the inspection result normal?
YES - Replace A/T assembly. Refer to Exploded View.
NO - Repair or replace damaged parts.