Vehicle Speed Signal

VEHICLE SPEED SIGNAL





Description
The vehicle speed signal is built into the speedometer assembly. The sensor functions as an auxiliary device to the output speed sensor when it is malfunctioning. The TCM will then use a signal sent from the vehicle speed 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 "VEHICLE SPEED SIGNAL" with CONSULT-III or 2nd judgement flicker without
CONSULT-III is detected when TCM does not receive the proper voltage signal from the sensor.




Possible Cause
- Harness or connector
(The sensor circuit is open or shorted.)
- Vehicle speed signal




DTC Confirmation Procedure

CAUTION:
- Always drive vehicle at a safe speed.
- If performing this "DTC Confirmation Procedure" again, always turn ignition switch OFF and wait at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT-III
1. Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
2. Touch "START".
3. Start engine and accelerate vehicle from 0 to 25 km/h (0 to 16 MPH).
4. If the check result is NG, go to SEE Diagnosis Procedure .

WITHOUT CONSULT-III
1. Start engine.
2. Drive vehicle under the following conditions:
Selector lever position: "D" position
Vehicle speed: Higher than 25 km/h (16 MPH)
3. Perform self-diagnosis. Automatic Transmission .
4. If the check result is NG, go to SEE Diagnosis Procedure .




Wiring Diagram - AT - VSSMTR






TCM TERMINALS AND REFERENCE VALUES
Automatic Transmission.




Diagnosis Procedure
1.CHECK INPUT SIGNAL
With CONSULT-III
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out the value of "VHCL/S SE-MTR" while driving. Check the value changes according to driving speed.





Without CONSULT-III
1. Start engine.





2. Check voltage between TCM connector terminal and ground.





OK or NG
OK - GO TO 3.
NG - GO TO 2.
2.DETECT MALFUNCTIONING ITEM
Check the following items:
- Combination meter. Combination Meters System Description .
- Harness for short or open between TCM and combination meter.
OK or NG
OK - GO TO 3.
NG - Repair or replace damaged parts.
3.CHECK DTC
Perform SEE DTC Confirmation Procedure .
OK or NG
OK - INSPECTION END
NG - GO TO 4.
4.CHECK TCM
1. Check TCM input/output signal. Automatic Transmission .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - INSPECTION END
NG - Repair or replace damaged parts.