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On a 94 firebird, would the vehicle speed sensor keep the transmission from going into lockup, even if the speedometer is showing right?

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Hi, the transmission control unit or TCU is a device that controls modern electronic automatic transmission. A TCU generally uses sensors from the vehicle as well as data provided by the Engine Control Unit to calculate how and when to change gears in the vehicle for optimum performance, fuel economy and shift quality.

The answer is "NO" because the speed sensor helps the transmission to go into lockup...

Posted on Oct 10, 2010

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1 Answer

Were is speed sensor located


The output speed sensor is located on the transmission. while standing in front of the vehicle and looking down at the transmission you will see two rubber hoses. under those hoses you will see the input speed sensor. if you look to the right of that sensor, and you may have to look from underneath the vehicle you will see another sensor that is identical to the input speed sensor. That is the output speed sensor. The output speed sensor is the one that shows how fast you are moving on the speedometer.

Apr 05, 2013 | Cars & Trucks

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Were is speed censour located


the output speed sensor is located on the transmission. while standing in front of the vehicle and looking down at the transmission you will see two rubber hoses. under those hoses you will see the input speed sensor. if you look to the right of that sensor, and you may have to look from underneath the vehicle you will see another sensor that is identical to the input speed sensor. That is the output speed sensor. The output speed sensor is the one that shows how fast you are moving on the speedometer.

Apr 05, 2013 | 2001 Chrysler Voyager

1 Answer

When driving the car the speedomator goes to 0 and then the tranmission starts slipping


There's a possible worn out clutch inside of the auto transmission. The speedometer going to zero could be the transmission not sensing speed, and then disengaging the transmission to keep the car from stalling at a stop sign, maybe.

Try looking at the VSS (vehicle speed sensor) circuit on the transmission.

Here are some tests that can be performed on the VSS:

A speed sensor. Courtesy of General Motors Corporation, Service Technology Group.
A defective vehicle speed sensor may cause different problems depending on the computer output control functions. A defective vehicle speed sensor (VSS) may cause improper converter clutch lockup, improper cruise control operation, and inaccurate speedometer operation.
  • Prior to VSS diagnosis, the vehicle should be lifted on a hoist so the drive wheels are free to rotate.
  • Backprobe the vss output wire and connect the voltmeter leads from this wire to ground.
  • Select the 20-volt AC scale on the voltmeter.
  • Then start the engine.
  • Place the transaxle in drive and allow the drive wheels to rotate. If the VSS voltage signal is not 0.5 volt, or more, replace the sensor.
  • When the VSS provides the specified voltage signal, backprobe the VSS terminal at the PCM and repeat the voltage signal test with the drive wheels rotating.
  • If 0.5 volt is available at this terminal, the trouble may be in the PCM (powertrain control module).
  • When 0.5 volt is not available at this terminal, turn the ignition switch off and disconnect the wire from the VSS to the PCM.
  • Connect the ohmmeter leads across the wire. the meter should read zero ohm.
  • Repeat the test with the ohmmeter leads connected to the VSS ground terminal and the PCM ground terminal.
  • This wire should also have zero ohm resistance. If the resistance in these wires is more than specified, repair the wires.
  • The condition of a speed sensor can be checked by going through the diagnostic routines for the system.
  • If this test indicates that a sensor is faulty, the sensor should be replaced.
  • Speed sensors can also be checked with an ohmmeter. Most manufacturers list a resistance specification.
  • The resistance of the sensor is measured across the sensor's terminals.
  • The typical range for a good sensor is 800 to 1400 ohms of resistance.

Nov 01, 2010 | 1997 Mercury Sable

1 Answer

My speedometer broke which in some didn't send a signal to the transmission that it had to be cooled. I burned up 2 transmissions in less 3 days...this is related to lockup....Can someone tell me what...


Lock up is a feature within the transmission torque converter which is a fuel saving measure.At cruising speeds,the torque converter "locks up" creating a 1:1 ratio from engine rpm to transmission input.This is somewhat like overdrive in a sense. TCC (torque converter clutch ) depends on the vehicle speed sensor input to determine cruising speeds and conditions where TCC is permissable.Incorrect TCC operation can cause subsequent damage and/or serious driveability problems.

Jul 09, 2009 | 1995 Toyota 4Runner

2 Answers

Chrysler Concorde 1998 dies on idle


Speedometer quit working-consider vehicle speed sensor.

Apr 09, 2009 | 1998 Chrysler Concorde

1 Answer

Not shifting into drive


Look into the speedometer issue. The pcm won't shift the transmission right without the speed input. Check the vehicle speed sensor. Is it 2 or 4 wheel drive?

Mar 12, 2009 | 1990 Ford F150

1 Answer

Where is the VSS (vehicle speed sensor)? OBD gives me #24


Hello! On 94 and earlier models it is located behind the glove box or close to the ECM. Cheers! Ryan

Feb 26, 2009 | 1989 GMC Suburban

2 Answers

2005 Chevy Impala speedometer


Replace the speed sensor, but also make sure you clear any codes, even if none are showing up, disconnect the battery for about 1 hour. After that drive it easy for a while, so it can relearn.

Jan 06, 2009 | 2005 Chevrolet Impala

1 Answer

Transmission shifts hard


Your car has the 125c/3T40 model trans,3 speed automatic with lockup.When you say you unplugged the "speedometer",if you are referring to a square electrical connector on the trans,facing the radiator,that connector is not the speedometer,but the lockup circuit inside the transmission.It is likely the lockup solenoid inside the side pan has gone bad and is malfunctioning.It is a common problem on those transmissions.You will lose some gas mileage by unhooking the connector,and eventually,years down the road,will hurt the trans from the fluid running too hot.Lockup clutch application in a General Motors lockup torque convertor helps to cool the fluid.

Sep 02, 2008 | 1990 Buick Skylark

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