Home » Uncategories » 98 Subaru Automatic Transmission Speed Sensor Drive Gear Replacement Procedure UPDATED

98 Subaru Automatic Transmission Speed Sensor Drive Gear Replacement Procedure UPDATED

98 Subaru Automatic Transmission Speed Sensor Drive Gear Replacement Procedure

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A vehicle speed sensor, or VSS, is a sensor that is used to determine how fast your vehicle is traveling. If your vehicle'due south speedometer stops working or isn't telling y'all the correct speed that you're traveling, you likely have a faulty VSS. You lot can exam your VSS to make sure information technology's operation properly past using a device called a multimeter. Start by disconnecting and removing the VSS from your engine so you can test it. You tin then connect it to a multimeter and set up the multimeter to the Ac setting. Connect the VSS to a power drill and then you lot can simulate the rotation of the vehicle'south transmission and read the multimeter to run into if the voltage increases as the speed increases to check if the sensor is working properly.

1
Brand sure the vehicle is turned off to avoid being shocked. Put the vehicle in park on level ground and turn off any lights or accessories that may draw power from the battery. Remove the key from the engine to make sure it'due south completely turned off.^[1]
- Parking on level ground makes information technology easier for you to access the VSS.
2
Open the hood of the vehicle so you tin admission the engine. Locate and pull the release hatch well-nigh the commuter'south side door to open the hood. Appoint the interior release hatch on the front end of your hood and heighten the hood upwards. If your hood uses a rod to hold it open, movement the rod to its slot.^[2]
- Make sure the hood is held securely in place before you lot lean into information technology to test the VSS.
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three
Locate the VSS sensor virtually the transmission of your vehicle. Find the transmission dipstick and follow information technology to locate your transmission. The VSS will be a small sensor fastened to your transmission by 2 wires and held in place past a bracket. Information technology will also have a sliding pull tab on it. Look for a small, metallic sensor surrounded by a metal subclass with a white and black wire connected to information technology.^[3]
- Vehicle speed sensors can exist installed in dissimilar locations depending on what make and model of vehicle you have, but they measure out the rotation of the transmission, and so they'll more often than not be located on or next to the transmission.
- Consult your possessor'south manual to find the location of your VSS.
Tip: If you don't have your owner'due south manual, or you're unable to find your vehicle'south VSS, search the make and model of your vehicle online to locate the VSS.
4
Disengage the wiring harness connector from the VSS. There are 2 wires connected to the VSS, a black one and a white ane. Both wires connect the VSS to your vehicle to ground the sensor and transmit information about you're vehicle's speed. Unplug the harness so you can take out the sensor.^[iv]
- The wiring harness may be located on the underside of the VSS.
- If yous tin can't grip the harness with your fingers, utilise a pair of needle-nose pliers to disengage it.
5
Press the pull tab or button on the VSS to separate it. On the top or side of your VSS will be a sliding tab or a button. Engage the tab or button and gently pull on the sensor to release it from its housing.^[5]
- You may demand to wiggle or slide the VSS out of its base.
- Don't forcefulness or yank the VSS or you could damage it. Make certain you've engaged the sliding tab or the button that releases information technology.
- Some sensors may require you to remove two pocket-sized screws to slide information technology out of identify.
6
Unscrew the hold-downwards bolt and bracket to remove the VSS. Apply a screwdriver to remove the bracket around the VSS. Then, use a socket wrench with a piece that fits over the commodities to twist the bolt and loosen it so you lot can pull out the sensor.^[6]
- Brand sure y'all don't lose the screws or bolts so y'all can supersede the sensor.
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Plug the colored lead cables into their slots on the multimeter. Your multimeter will have a red and a black lead cablevision. Plug the black lead into the black colored terminal that's labeled "COM" which stands for common. Then, insert the red lead into the reddish colored terminal labeled "V" for voltage, which is what you're testing.^[seven]
- Push button the leads into their slots completely. They may "click" into place when they're fully connected.
ii
Set the multimeter to AC to test your VSS. Look for a dial on your multimeter that has numbers and messages on it. The Air conditioning, or alternating current, setting may exist labeled as Ac, V with a squiggly line, or ACV. Turn the dial until the arrow or indicating line is pointing to the Air-conditioning setting.^[8]
- Electric devices, such as your VSS, employ an Ac current for power.
3
Plug a signal output and ground wire into the sensor. On the VSS is a slot where the sensor plugs into the vehicle. You can find a plug that fits into your VSS and contains a white point output wire and blackness ground wire from auto supply stores. Brand certain the plug fits your VSS deeply.^[nine]
- The plug uses a white signal output wire and a blackness footing wire to transmit signals from the device to your vehicle.
- You can too observe plugs that contain the signal wire and ground online.
four
Connect the blackness lead and the ruddy lead to wires on the plug. Take your black lead wire and clip it to the exposed wire at the end of the black ground wire plugged into the VSS. Then, take your ruby-red lead wire and connect it to the exposed end of the white betoken wire plugged into the sensor.^[10]
- Brand sure the red and black leads are securely connected.
Tip: If the indicate wire and ground wire are completely covered in sheathing, utilise a pocketknife to strip nearly ¹⁄₄ inch (0.64 cm) of the wire sheathing to expose the wire below so you tin can clip your leads to it.

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Observe a drill bit that fits securely into the VSS. In order to simulate the motility of your vehicle to properly test the sensor, you need to rotate the gear inside of the VSS. Insert drill bits into the gear slot on the VSS until you discover one that fits deeply into it.^[eleven]
- Unlike sensors have differently sized slots, so try out a few bits until you observe i that fits your VSS.
2
Connect the scrap to your power drill. Loosen the chuck, or the piece on the stop of the drill, by rotating information technology so the jaws open upward. Slide the polish end of the bit into the jaws and then slowly rotate the drill to tighten the jaws around the bit then it'due south held securely.^[12]
- Requite the bit a gentle tug to brand sure it won't autumn out.
iii
Spin the gears of the VSS by pulling the trigger on the drill. Hold the VSS in place with your hand and bring the drill up to speed slowly to rotate the gears in the slot the drill bit is inserted into. Let the VSS to rotate at total speed so you tin become an accurate reading.^[thirteen]
- Get-go slowly and continue to increment the speed of the drill at a consistent pace so yous don't strip or harm the VSS.
4
Read the voltage on the multimeter to run into if it increases with speed. While the VSS rotates, the multimeter will display a voltage reading. If the VSS is functioning correctly, the voltage on the multimeter will increase as the speed of the VSS rotation increases.^[14]
- If the voltage doesn't increment or doesn't display at all, then the VSS is damaged or faulty.
Tip: Rotate the VSS at varying speeds to brand sure the multimeter is accurately detecting speed changes.
five
Disconnect the plug and drill, and reinstall the VSS into your vehicle. Remove the drill bit from the VSS and accept out the plug containing the white signal output and black basis wires. If the VSS is performance properly, slide it back into its housing, reconnect the wiring harness, and supplant the bracket and bolts.^[15]
- If your VSS isn't functioning properly, replace it with the aforementioned make and model and so it fits into your vehicle.
- Have a mechanic inspect your vehicle if your VSS is functioning but your speedometer however isn't working properly.
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Things You'll Need

Multimeter
Screwdriver
Socket wrench
Signal output and ground wire plug
Power drill
Drill flake

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