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Eric, Automotive Repair Shop Manager
Category: Toyota
Satisfied Customers: 29713
Experience:  20+ yrs. experience as repair shop manager and technician.
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1992 toyota: problems with the speedometer

Resolved Question:

i have a 1992 toyota truck. i having problems with the speedometer. it works when it feel like it. sometimes if i swicth to 4x4 on and off it will work for a period of time.
Submitted: 4 years ago.
Category: Toyota
Expert:  Eric replied 4 years ago.


ok it could be the Vehicle Speed Sensor, Speedometer, or the Wiring Harness


Customer Concern: Speedometer is inoperative. Vehicle Speed Sensor (VSS)


Tests/Procedures: 1. Verify battery voltage on the Black/Orange wire and ground on the Green/Blue wire at the VSS.

2. Scope the VSS signal Green/Red wire and look for a square wave signal.


Potential Causes:

Vehicle Speed Sensor (VSS)
Wiring Harness
Tech Tips: The 3-wire vehicle speed sensor inputs a square wave signal into the speedometer. There is a reference voltage from the computer that the speedometer pulses to ground, creating the VSS signal for the computer. If there is no signal from the VSS, replace the VSS. If there is a good signal from the VSS and the signal is good at the speedometer too and the speedometer does not work, then replace the speedometer. The VSS is at the transfer case (4WD) or the transmission (2WD).

Customer: replied 4 years ago.
if it could be the vss. why it works for a day or for a few moments? sometimes it works if i shift to 4x4 back and foward a few times. i can't spend 360.00 dollars on a new vss just to see if solves the problem.
Expert:  Eric replied 4 years ago.

that is why you do the test I provided you with first before replacing any parts. it is possible that the VSS has an intermittent short in it, or that there is a short in the wiring harness. you do the test to determine if the VSS is bad or not.

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