Relearn Procedures Require TPMS Tool
Most vehicles require some type of “stationary” relearn procedure to reset the TPMS system. This requires a TPMS tool to activate each of the tire pressure sensors in a specified sequence so the TPMS control module can relearn their new locations.
Pay Close Attention To These Brake Hardware Items
If the caliper is not free to move, the culprit might be bent or binding mounting pins. Even if guide pins are not damaged, swollen or hardened guide seals or lack of lubrication may cause the caliper to bind resulting uneven pad wear. Always inspect all mounting surfaces and hardware for corrosion, wear or misalignment. Replace all mounting hardware and install a replacement caliper using the proper caliper lubricant.
Wheel Bearing Torque Dos and Don’ts
While it may appear to be easier to use an impact wrench, it is not recommended. OEM and bearing manufacturers always recommend using a torque wrench for installation. During removal, an impact wrench can damage the axle nut threads and shock the CV joints. It can also create a false sense of security when adjusting a nut or bolt, which may be under or over torqued.
Automatic Transmission/Transaxle Test Prep: Torque Converter Basics
The concept of using a torque converter, oil pump, planetary gear sets, clutches, bands and a computer-controlled hydraulic valve body to transmit torque and to change gear ratios is relatively simple. To illustrate, the torque converter allows the engine to idle in gear with the vehicle stopped and multiplies engine torque during the initial stages of acceleration.
Diagnosing Inoperative Fuel Pumps
As I’ve discovered recently, times change and so do the procedures for diagnosing inoperative fuel pumps. Just a few weeks ago, I diagnosed a case in which the owner had started his vehicle for several months by spraying starting fluid (ether) into his truck’s air intake before he cranked the engine.
Tech Update: Electronic Stability Control
Electronic stability control (ESC) was introduced in 1995 and touted as the second most important advancement in auto safety, after seat belts, becoming standard equipment on every 2012 passenger vehicle. ESC is supposed to help drivers maintain safe control of their vehicles and prevent accidents. However, it’s the tires that determine the effectiveness of ESC for every vehicle.
Hyundai 1.6-2.4L Tech Tip: Check The Weights On The Shafts Before Installing Belts
The addition of the balance belt won’t cause any problems as long as it’s timed correctly and the counterweights are in the proper position when the belts are installed. There are access holes in the block that allow you to insert a punch or screwdriver to ensure the weights are at the bottom of the shaft, but they are not always necessary.
Fuel Trim Diagnosis And O2 Sensor Performance
A useful diagnostic tool is to determine if the fuel trim problem exists in more than one engine operating range. Fuel trim should be checked at idle, at 1,500 rpm and at 2,500 rpm. In addition to these no-load checks, drive the vehicle at various steady load conditions and watch for fuel trim variation.
Mazda Feature: Driveability And Check Engine Light Diagnostics
Import Specialist Bob Dowie takes a look at some of the more common ailments that will bring your Mazda customers into your service bay with a check engine light complaint, as he covers common DTCs, stalling and ignition issues and new technology.
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.
Editor’s Notebook: Marketing To Women Should Be One Of Your Top Priorities
In case you haven’t noticed, female buying power is on the rise. Women account for about 85% of all automotive sales in U.S. households, and 50-65% of customers at automotive service centers are women. And you know what that spells? Opportunity.
Gonzo’s Toolbox: Driving, Drinking And Grandpa
On one of many slow days at the shop, I had a small job come in from one of the local tire shops. This rather young girl brought the car to me from the tire shop that’s just a few blocks away. She told me she was the owner and that the tire shop was rude and wouldn’t help her, so I called the tire shop to find out what was the deal.