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Chevrolet Master
6,826 Answers
- Posted on Sep 02, 2010
Re: How do u change speed sensor cable on a 2005 chevy...
Speed Sensors (2 types)
Removal & Installation
Front
To Remove:
- Raise and safely support the vehicle.
- Remove the wheel assembly.
- Remove the brake rotor.
- Remove the Wheel Speed Sensor (WSS) cable clip from the knuckle.
- Remove the WSS cable clip from the upper control arm.
- Remove the WSS cable clip from the frame.
- Remove the WSS cable electrical connector.
- Remove the WSS mounting bolt.
CAUTION
Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device to pry the sensor out of the bore. Prying will cause the sensor body to break off in the bore.
- Remove the WSS from the hub/bearing assembly.
To Install:
- Seal the WSS bore to prevent dirt or debris from falling into the hub.
- Clean the mounting surface on the hub to remove any rust or corrosion.
- Apply wheel bearing lubricant, GM P/N 01051344 or equivalent to the hub surface and the sensor O-ring to ease sensor installation.
- Install the WSS into the hub/bearing assembly.
- WSS sensor must be seated flat against the hub.
- Install the WSS mounting bolt. Tighten to 13 ft lbs (18 Nm).
- Install the WSS cable mounting clips.
- Connect the WSS cable electrical connector.
- Install the brake rotor.
- Install the wheel assembly.
- Verify proper operation.
Rear
To Remove:
- Raise and safely support the vehicle.
- Disconnect the electrical connector.
- Remove the wheel speed sensor bolt.
- Remove the wheel speed sensor.
To Install:
- Install the wheel speed sensor using a twisting motion, until fully seated
- Install the wheel speed sensor retaining bolt. Tighten to 10 ft lbs (13 Nm).
- Connect the electrical connector.
- Lower the vehicle.
- Perform a low speed test for proper operation:
- Start the engine and allow it to idle.
- Verify the ABS indicator or the traction assist indicator remains illuminated.
- If the ABS indicator or the traction assist indicator remains illuminated, DO NOT proceed to drive the vehicle until it is diagnosed and repaired. Check the wheel speed sensor electrical connector to ensure it is not damaged and is installed properly. If the lamp remains illuminated, diagnostics are required.
- Select a smooth, dry, clean, and level road or large lot that is as free of traffic and obstacles as possible.
- Drive the vehicle and maintain a speed of at least 16 km/h (10 mph) for at least 5 seconds.
- Stop the vehicle and check to see if the ABS indicator or the traction assist indicator is illuminated.
- If an indicator is illuminated, diagnostics are required.
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Vehicle Speed Sensor
Operation
Vehicle Speed (VSS) Sensor(s) input is used by the EMS to determine vehicle speed. The VSS generates a signal that increases in frequency proportionate to vehicle speed. The EMS has a base frequency stored in memory for a distance of one mile. By comparing the input and stored value the EMS calculates vehicle speed.
VSS types include: photo-optic, permanent magnet generators or Hall Effect technology. The EMS may use other sensors on the vehicle such as ABS wheel speed to validate VSS operation.
VSS information is used to calculate vehicle loads including: torque converter application, cruise control, fuel cutoff/speed governance strategies, instrument panel speedometer and more.
Modified drivetrain components such as final gear sets and/or tires can alter VSS input values to the EMS. Improper signals can alter torque converter clutch (TCC) application, shift points, cruise control operation as well as many other systems relying on vehicle speed input.
Related Symptoms
A faulty speed sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
- Overheated transmission
- Increased emissions
- Poor fuel economy
- Stalling on deceleration
- Improper shift points
- Cruise control inoperative
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