Sorry for the delay in replying.
VSS would not show any defet if it is faulty as it is electrically controlled and you need to test the pulse. One simple way is to check if the driving or driven gear is faulty.
Here are the diagnostic procedures for testing.
Speedometer/Vehicle Speed (4-Pulse) Signal Check
1 . Drive vehicle and check odometer operation. If odometer does not operate, trouble shoot odometer. If odometer operates properly, remove instrument cluster with wiring harness still attached. Go to next step.
2 . Turn ignition on. Connect voltmeter between instrument cluster connector terminal No 14, connector A, and ground.
Raise and support vehicle and rotate drive shaft.
3 . Voltage should fluctuate between zero volts to 5 volts (or more) per revolution of drive shaft. If voltage does not exist or does not fluctuate as indicated, go to step 5). If voltage fluctuates, go to next step.
4 . Check wiring harness between instrument cluster and cruise control ECU. If speedometer/vehicle speed (4-pulse) signal and wiring harness are okay, check and replace cruise control ECU. If speedometer/vehicle speed (4-pulse) signal and wiring harness are not okay, trouble shoot instrument cluster or repair wiring harness.
5 . Replace circuit plate. If circuit operation is correct, replace character plate. If circuit operation is still incorrect, replace instrument cluster computer.
Sunday, November 15th, 2009 AT 8:35 AM