Tech Feature: Understanding the Differences, Challenges Between Crankshaft Position Sensors
There are two basic types of crankshaft position sensors: Magnetic Field (Variable Reluctance) and Hall Effect. The magnetic type uses a magnet to sense notches in the crankshaft or harmonic balancer. The Hall Effect crank sensor uses notches or shutter blades on the crank, cam gear or balancer to disrupt a magnetic field in the Hall Effect sensor window.
Symptoms of a Worn Wheel Hub Bearing – Timken Offers Warning Signs
Signs of a worn wheel hub bearing vary in severity. Some may be difficult to detect, leading to damage before corrective action can be taken. The timeframe in which damage occurs is linked to driving conditions and/or the mechanical practices that were followed at installation. Noise is a classic sign of a bad wheel bearing
Wheel Bearings
Wheel bearings can be of either ball or tapered roller type. The ball bearings used for front wheel bearing applications are an angular type. An angular-type ball bearing will accept greater thrust loads than a Conrad-type bearing, which will accept a 100 percent load in the radial or thrust position and any combination of a 100 percent load. A tapered roller bearing will accept both a radial and a thrust load. All wheel bearings come in sets.
Delphi Parts Featured in Upcoming SPEED Episodes of Two Guys Garage and Truck U
Delphi Automotive has teamed up with SPEED, a premier cable network, to provide products and technical insight for two of the network’s most popular shows – Two Guys Garage and Truck U.
Transmission Update: Speed Sensor Diagnostics
Weird and unusual problems are my bread and butter diagnostics. By the time these odd problems get to me the owner of the vehicle has more than likely reached their threshold of poor diagnostics skills and bad results. Their opinion of every technician out there comes down to the same inevitable answer: “We’re all the same.” I doubt that very seriously. It’s almost laughable when you start quizzing them on where they had their car prior to bringing it in.
Tech Tip: Cam and Crank Sensor Diagnosis
Today’s cars have several different methods of producing spark and setting fuel injector pulses. All of the sensors create a nominal voltage by way of what is referred to as a “Hall effect,” either from an external magnet mounted on the cam gear or body of the distributor housing, or it has its own small magnet inside itself and the Hall effect is created by passing the sensor over or near a piece of slotted metal.
Tech Tip: Mazda ABS Warning Light On and Grinding Noise from Front Wheels
If a customer brings in a Mazda with an ABS warning light and a grinding noise from the front wheels, it could be due to problems with the sensor rotor or with the front brake disc, depending on the model.
Tech Tip: All Wheel Drive Synergies for Brakes, Transmission and Transfer Case
There are very few all-mechanical controls left on late-model vehicles. Almost all powertrain controls are electromechanical using a computer as the controller. These include powertrain control of the accelerator pedal with the latest being All Wheel Drive (AWD). The brakes and damping are also electromechanical under electronic control. There are peripheral systems that are all computer controlled such as Electronic Stability Control (ESC) and Adaptive Cruise Control (ACC).
Ignition Sensor Diagnostics: Variable-Reluctor, Hall Effect and Magneto-Resistive Sensors
Although ignition failures are relatively common, they’re not the easiest problem to diagnose. To help you get started on what I call a “systems approach” to ignition diagnostics, this article is intended to provide an overview of how to identify ignition system configurations, identify three different types of ignition sensors and understand several basic sensor-operating strategies.
Tech Feature: Servicing Worn Wheel Bearings
When a wheel bearing goes out on a vehicle, it may or may not give much warning. Typical clues include noise from the vicinity of the wheel, possibly some steering wander or looseness in the steering, and/or some abnormal tread wear on the front tires. Also, an ABS light could illuminate.