P0500

Component Description
The vehicle speed sensor is installed in the transaxle. It contains a pulse generator which provides a vehicle speed signal to the speedometer. The speedometer then sends a signal to the ECM.




ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and 32 (ECM ground).

On Board Diagnosis Logic:

DTC Confirmation Procedure

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

TESTING CONDITION:
Steps 1 and 2 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

With CONSULT
1. Start engine.




2. Perform "VEHICLE SPEED SEN CKT" in "FUNCTION TEST" mode with CONSULT.
3. If NG, go to "Diagnostic Procedure" below. If OK, go to following step.
4. Select "DATA MONITOR" mode with CONSULT.
5. Warm engine up to normal operating temperature.




6. Maintain the following conditions for at least 10 consecutive seconds.

CMPS.RPM (REF) 1,400 - 2,800 rpm
COOLAN TEMP/S More than 70°c (158°F)
B/FUEL SCHDL 2.3 - 4.5 msec
Selector lever Suitable position
PW/ST SIGNAL OFF

7. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With CONSULT
1. Start engine
2. Read "VHCL SPEED SE" in "DATA MONITOR" mode with CONSULT. The vehicle speed on CONSULT should exceed 10 kph (6 MPH) when rotating wheels with suitable gear position. If NG, go to "Diagnostic Procedure" below.
If OK, go to following step.
3. Select "DATA MONITOR" mode with CONSULT.
4. Warm engine up to normal operating temperature.




5. Maintain the following conditions for at least 10 consecutive seconds.

CMPS.RPM (REF) 1,400 - 2,800 rpm
COOLAN TEMP/S More than 70 °c (158 °F)
B/FUEL SCHDL 2.3 - 4.5 msec
Selector lever Suitable position
PW/ST SIGNAL OFF

6. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

Overall Function Check
Use this procedure to check the overall function of the vehicle speed sensor circuit. During this check, a 1st trip DTC might not be confirmed.

With GST
1. Lift up drive wheels.
2. Start engine.
3. Read vehicle speed sensor signal in "MODE 1" with GST. The vehicle speed sensor on GST should be able to exceed 10 kph (6 MPH) when rotating wheels with suitable gear position.
4. If NG, go to "Diagnostic Procedure" below.




Without Scan Tool
1. Lift up drive wheels.
2. Start engine.
3. Read the voltage signal between ECM terminal 29 (Vehicle speed sensor signal) and ground with oscilloscope.
4. Verify that the oscilloscope screen shows the signal wave as shown at "ECM Terminals and Reference Value".
5. If NG, go to "Diagnostic Procedure" below.

EC-VSS-01:

EC-VSS-01 Connectors View:

Wiring Diagram






Diagnostic Procedure

Step 1:

Step 2:

Step 3:

Step 4:

Step 5: