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Mike S.
Mike S., Chevy Mechanic
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Experience:  ASE Certified Master Technician
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I have a 1995 Chevy Silverado, 4x4. A while ago we replaced

Customer Question

I have a 1995 Chevy Silverado, 4x4. A while ago we replaced the clutch, shortly afterwards, the speedometer stopped working. The Tach is fine but no reading on the speedometer. I checked the connections, replaced the speed sensor that plugs into the transfer case. Still no speedometer. Is there a fuse related or some other solution I am not thinking of?
Submitted: 4 years ago.
Category: Chevy
Expert:  Mike S. replied 4 years ago.

Available engines ?
6 Cylinders Z 4.3L TBI
8 Cylinders H 5.0L TBI (found in 9% of 1995 Chevrolet K1500 1/2ton P/U 4WD)
8 Cylinders K 5.7L TBI (found in 89% of 1995 Chevrolet K1500 1/2ton P/U 4WD)
8 Cylinders P 6.5L Diesel (found in 1% of 1995 Chevrolet K1500 1/2ton P/U 4WD)
8 Cylinders S 6.5L Turbo Diesel (found in 1% of 1995 Chevrolet K1500 1/2ton P/U 4WD)

 

Expert:  Mike S. replied 4 years ago.


Click image to see an enlarged view

Fig. Fig. 16: 1995 Pick-Up/Sierra 4.3L and 7.4L w/MT Engine Schematic



Click image to see an enlarged view

Fig. Fig. 17: 1995 GM Truck 5.0L and 5.7L w/MT Engine Schematic



Click image to see an enlarged view

Fig. Fig. 18: 1995 Pick-Up/Sierra 6.5L Diesel/Turbo Diesel w/MT Engine Schematic



Click image to see an enlarged view

Fig. Fig. 19: 1995 GM Truck 4.3L, 5.0L, 5.7L, and 7.4L w/AT Engine Schematic



Click image to see an enlarged view

Fig. Fig. 20: 1995 Pick-Up/Sierra 6.5L Turbo Diesel w/AT Engine Schematic

Click image to see an enlarged view

Fig. Fig. 27: 1995-98 GM Truck Chassis Schematic



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Fig. Fig. 28: 1995-98 GM Truck Chassis Schematic

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Wiring+Diagrams&partName=Chassis+Electrical&pageId=0900c1528008f3ce&partId=0900c1528008f2c2

Expert:  Mike S. replied 4 years ago.

Vehicle Speed Sensor - Location

1995 Chevrolet Truck K1500 1/2ton P/U 4WD 5.7L TBI 8cyl

The Vehicle Speed Sensor - Location is located:

In transfer case.

 

Sensor - Transmission Speed

1995 Chevrolet Truck K1500 1/2ton P/U 4WD 5.7L TBI 8cyl

The Sensor - Transmission Speed is located:

Mounted on transmission

 

Vehicle Speed Sensor (VSS)

OPERATION



The vehicle speed sensor is sometimes located behind the speedometer or more commonly on the transmission. It sends a pulsing voltage signal to the ECM, which the ECM converts to vehicle speed. This sensor mainly controls the operation of the Torque Converter Clutch (TCC) system, shift light and cruise control.

TESTING



See Figure 1

  1. Backprobe the VSS terminals with a high impedance voltmeter (set at the AC voltage scale).
  2. Safely raise and support the entire vehicle using jackstands. Make absolutely sure the vehicle is secure.
  3. Start the vehicle and place it in gear.
  4. Verify that the VSS voltage increases as the speed increases.
  5. If the VSS voltage is not as specified the VSS may be faulty.




Click image to see an enlarged view

Fig. Fig. 1: Vehicle Speed Sensor (VSS) wiring diagram

 

Vehicle Speed Sensor (VSS)

OPERATION



The vehicle speed sensor is made up of a coil mounted on the transmission and a tooth rotor mounted to the output shaft of the transmission. As each tooth nears the coil, the coil produces an AC voltage pulse. As the vehicle speed increases the number of voltage pulses per second increases.

TESTING



See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Vehicle Speed Sensor (VSS) and vehicle speed signal buffer wiring diagram

  1. To test the VSS, backprobe the VSS terminals with a high impedance voltmeter (set at the AC voltage scale).
  2. Safely raise and support the entire vehicle using jackstands. Make absolutely sure the vehicle is stable.
  3. Start the vehicle and place it in gear.
  4. Verify that the VSS voltage increases as the drive shaft speed increases.
  5. If the VSS voltage is not as specified the VSS may be faulty.

 

Customer: replied 4 years ago.
Thus far I have changed the VSS, no change. I changed the #18 fuse located on the left side of the dashboard 10A. The fuse was in good order, but I changed it anyway. The paper on the inside of the panel lists fuse #18 as BRAKE. I then checked every fuse in that panel to see if any needed replacement and all were in good working order. Tach works fine but no speedometer.
Expert:  Mike S. replied 4 years ago.

 

Rear Wheel Speed Sensors

On trucks the rear wheel sensors are located at each rear wheel and held on by 2 bolts. The brake drum and front shoe must be removed to access the sensor. The rear wheel sensor sends its signal to the Vehicle Speed Sensor buffer located behind the instrument cluster. The buffer maintains accurate speedometer/odometer readings and proper ABS function.

 

 

Expert:  Mike S. replied 4 years ago.
The vehicle speed sensor (VSS) is mainly for transmission torque converter lockup.

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