Replace the input speed sensor on the CVT transmission to resolve transmission shifting issues, speedometer errors, or check engine lights related to transmission speed sensor faults.

Warnings

Tools required

Parts

• Input speed sensor (CVT) × 1 — 89413-02050 or equivalent OEM
• O-ring for speed sensor × 1 — Often included with sensor

Fluids

• Toyota WS ATF — 0.5 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. If engine is warm, allow transmission to cool for at least 30 minutes
3. Disconnect negative battery cable to clear fault codes during repair
4. Raise front of vehicle and secure on jack stands
5. Remove driver-side front wheel for improved access (optional but recommended)
6. Remove plastic splash shield under engine if equipped using 10mm socket

Procedure

1. 1

   Locate the input speed sensor
   The input speed sensor is mounted on the driver's side of the CVT transaxle, near the front axle area. It has a single electrical connector and is secured by one 10mm bolt. Clean the area around the sensor with a wire brush to remove dirt and debris before removal.
2. 2

   Disconnect the electrical connector
   Press the locking tab on the sensor electrical connector and pull straight out to disconnect. Do not pull on the wires themselves. Inspect the connector terminals for corrosion or damage.
3. 3

   Position drain pan
   Place a drain pan directly under the speed sensor location. Expect approximately 4-8 ounces of transmission fluid to drain when the sensor is removed.
4. 4

   Remove the sensor mounting bolt
   Using a 10mm socket, remove the single bolt securing the input speed sensor to the transmission case. Keep the bolt as it will be reused.
   Torque spec

   Sensor Bolts10 Nm (8 lb-ft)
5. 5

   Extract the speed sensor
   Carefully pull the sensor straight out of the transmission housing. Twist slightly while pulling if resistance is felt. Transmission fluid will begin draining immediately once the sensor is removed. Allow fluid to drain into the pan.
6. 6

   Inspect and clean the mounting bore
   Examine the sensor bore in the transmission case for metal debris or contamination. Wipe clean with a shop towel. Check the old sensor for metallic particles on the magnetic tip which may indicate internal transmission wear.
7. 7

   Prepare the new sensor
   Remove the new input speed sensor from packaging. Verify the new O-ring is properly seated in the groove on the sensor body. Lightly lubricate the O-ring with clean Toyota WS ATF to ease installation and prevent damage.
8. 8

   Install the new sensor
   Insert the new speed sensor straight into the transmission bore, ensuring the O-ring does not roll or pinch. Push firmly until the sensor is fully seated flush against the transmission case. The mounting hole should align with the threaded bore.
9. 9

   Secure the sensor
   Install the 10mm mounting bolt and tighten to specification using a torque wrench. Do not overtighten as this can crack the sensor housing or strip the aluminum transmission case threads.
   Torque spec

   Sensor Bolts10 Nm (8 lb-ft)
10. 10

    Reconnect the electrical connector
    Push the electrical connector onto the sensor until it clicks into place. Verify the locking tab is fully engaged by gently pulling on the connector body (not the wires).
11. 11

    Check and add transmission fluid
    Check the transmission fluid level using the dipstick (if equipped) or through the fill plug. Add Toyota WS ATF as needed to replace the fluid lost during sensor removal. Typically 0.25-0.5 quarts will be needed. Ensure the fluid is at the proper level with the engine running and transmission at operating temperature.
12. 12

    Reinstall underbody components
    Reinstall the plastic splash shield if removed. Reinstall the wheel if removed and torque lug nuts to specification. Lower the vehicle from jack stands.
13. 13

    Reconnect battery and clear codes
    Reconnect the negative battery cable. Use an OBD-II scanner to clear any stored diagnostic trouble codes related to the speed sensor. This allows you to verify the new sensor is functioning correctly.

Reassembly

1. Ensure all electrical connectors are fully seated and locked
2. Verify no tools or parts were left in the engine bay or under the vehicle
3. Double-check transmission fluid level with engine at operating temperature

Verification

• Start the engine and shift through all gear positions (P-R-N-D)
• Take a test drive and verify the speedometer functions correctly
• Verify no transmission warning lights are illuminated on the dashboard
• Use an OBD-II scanner to confirm no speed sensor codes are present
• Check for any transmission fluid leaks around the sensor after test drive

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