Shocks and Struts: A Crucial Part of the Electronic Equation
When a vehicle’s ABS or stability control is really needed, how well it works is directly related to the tire’s contact patch. If the tire does not have traction, any type of electronic intervention or driving skill will not bring the car back under control. During a panic stop, weight transfers to the front tires,
False ABS Activation After Wheel Bearing Hub Replacement
Vehicles: All ABS-equipped vehicles Condition: Vehicle had wheel bearing hub replaced on one side. Repair Procedure: If you diagnose a bad hub bearing on one side of a vehicle and the ABS wheel speed sensor or tone ring is integral to the bearing, you may need additional repairs to restore proper ABS functioning. In many
Your Guide to the Kia Brake Job
Kias will provide little challenge for any tech currently handling basic brake work. All it takes is paying attention to details and good work habits to make it profitable. An occasional long pedal could be a master cylinder bleeding down, which usually happens in a stop-and-go or a downhill situation where the brakes are being
Anti-lock Brake Case Study: 2002 Cadillac DeVille
• ABS light on • Traction control light on • Brake Warning light on • Codes C1248 – C1255 • No communication with electronic brake control module (EBCM) I always try to keep the diagnostic side as simple as possible: do the basics, get the codes, do the research and do it all as fast
Indirect Tire Pressure Monitoring Systems Making A Comeback On Some Imports
Indirect Tire Pressure Monitoring Systems (TPMS) are the systems that do not have air pressure sensors inside the tires. Rather, they detect a low tire by comparing relative wheel speeds via the Anti-lock Brake System (ABS) wheel speed sensors. New systems are taking advantage of better wheel speed sensors and modules to make indirect systems work. Indirect TPMS began making a comeback in 2011 on all Audi models. The highly popular Honda Accord switched to indirect TPMS for the 2013 model year.
Chrysler Tech Tip: ETC Light Illuminated Or Diagnostic Trouble Code P2122 And/Or P2127 Set
Some customers may experience an ETC light illumination. Upon further investigation, the technician may find that DTCs P2122 – Accelerator Pedal Position Sensor 1 Circuit Low and/or P2127 – Accelerator Pedal Position Sensor 2 Circuit Low have been set.
VIEWPOINT:Monday Morning MIL Light Quarterback
Monday mornings are typically not very productive for me. I typically will hide in my office with the light off to avoid people asking about their latest weekend-induced car problems.
Tech Tip: Nissan Maxima’s ABS Activates On Normal Braking, ABS Warning Lamp Is On
If you confirm that the ABS light is on with one or more of the following DTCs stored – C1105, C1110, C1124, C1126 – and/or the ABS system activates with normal braking, follow the Service Procedure.
Tech Tip: Generation 1 Wheel Bearings With Integrated ABS Tone Ring
The front wheel bearings listed in this Tech Tip all share a unique design feature. They are all double-row angular contact with a split inner ring. The distinctive feature on these bearings is that one of the two seals on the bearing has a built-in magnetic impulse wheel. Caution should be taken to make sure that the seal with the ABS impulse ring is installed in the correct direction.
Diagnosing Passive Wheel Speed Sensors
The passive wheel speed sensor has been around a long time. It works quite differently than the active speed sensors that are found on most cars today. The passive speed sensor creates its own AC signal that changes frequency with wheel speed. This signal is only present while the wheel is turning at a rate fast enough to create the AC signal.
Chrysler Tech Tip: ESP Lamp Flashing/ESP Pump Howl
Some drivers may notice a howl or groan sound while driving straight after a low speed spirited turning event. On SRT vehicles only, when the vehicle has been switched to the “Full On” ESP mode, the ESP event lamp continues to flash. This does not affect the functionality of the ESP system in any way. The system can be returned to “normal Full-On” mode by briefly pressing and releasing the ESP Off switch. The system will reset itself each time the ignition is cycled.
Active Wheel Speed Sensor Diagnostics
There are two “types” of sensors generally found on the modern car – the passive speed sensor and the active speed sensor. They both perform the same function, but work entirely different. The passive speed sensor uses a magnet with fine copper wire wrapped around it to create its own alternating magnetic field. The polarity changes from positive to negative as the tone ring passes by the magnetic field. This frequency changes with wheel speed.