The Usual Culprits behind Toyota Pickup Speed Sensor Troubles
The speed sensor in your Toyota Pickup has other functions aside from sending speed information to the engine control system. The sensor helps the anti-lock braking system to maintain the directional stability of the wheel, and it assists in regulating the power steering pressure. That's why when you experience handling and stability problems while driving, you have to immediately check the speed sensor and do some troubleshooting. Here are some of the problems you might encounter:
Speedometer suddenly stops working
If the speedometer of your vehicle suddenly fails, a probably culprit of this problem is a faulty speed sensor. However, you should first test the connecting wires if they have power and the of the vehicle ground before you diagnose the speed sensor. If the wire and ground are working properly, then what you need to do is to check the speed sensor gear. You must refer to the owner's manual to find the right wiring diagram of your vehicle and to know the location of speed sensor and the speed sensor gear.
Disabled traction and stability control system
The speed sensor of your vehicle gauges the wheel speed in revolutions per minute or rpm and ensures that the wheel doesn't lock up when you step on the brakes. When the speed sensor malfunctions, the ABS light will switch on and the traction and stability control system will be disabled. If this occurs, you should check the ABS system first before checking the speed sensor. After you've found that the ABS system is working fine, you should diagnose the speed sensor and the sensor wheel area. Since you already have your hands on the sensor, you should clean the parts and the area around it as well.
Bad transmission timing
When you feel that the clutch of your vehicle is shifting at the wrong moment, it can be a sign that the speed sensor is causing a problem with the car's transmission. Another example of this is when you step on the gas pedal and you feel the transmission shift upward and then down suddenly. When this problem occurs, you have to remove the speed sensor from the transmission and check it using a voltmeter because it may already be defective.