There can be many causes when your car’s standard transmission not shifting well. Absence of fluid, burnt clutches, or any of the oodles of parts make up your car’s standard transmission. How do you know where to start? Most transmission shops will execute a rapid audit, in which they look to make sure that your automatic transmission is full of fluid and that the fluid is not burnt.
If the fluid looks trustworthy they will tell you that they need to take off the automatic transmission to take a gander inside to see exactly what has gone bad on the internal of your car’s automatic transmission.
This happens hundreds of times each day around the region. The difficulty is, it is not the flawless next step. A well executed computer diagnostic will often lead to the correct answer, which is an out of line automatic transmission sensor. Because today’s newfangled transmissions are electronic as well as hydraulic, they use commands given from the vehicles computer to the transmissions sensors to let the transmission know, at exactly what speed to carry out a shift.
One of the automatic transmission sensors that mostly fails, is the auto speed sensor. Most newer Car Speed Sensors are of the permanent magnet brand, and run much the same as a camshaft or crankshaft sensor. The sensors can be framed either in the automatic transmission case or rear differential assembly. Those in the automatic transmission are typically gear driven, and those in the differential perform by using a trigger wheel mounted with the ring gear.
Both style sensors go the same task. Driveability symptoms induced by a defective sensor can vary greatly due to the number of tasks the sensor output is involved in. Most vehicle computers will set related maintenance motor light codes for auto speed sensors that malfunction. But what if there are no codes? What should we see for? First, see if there are multiple systems with concerns that can be related to a faulty speed sensor. For instance, if our transmission is shifting below par and your speedometer is not working, then you may have a speed sensor quandary.
So how do we review for a suspect VSS? If you have a scan tool available then pull up the VSS value and inspect for weird or wrong readings. Follow up with component and wiring tests as needed. First find a resistance value for a new sensor, and survey for correct resistance across the sensor terminals. Also, survey for metal contamination on the magnetic pick-up and check trigger wheel or drive gears for damage. Due to the locations of many connectors, water intrusion can also be an quandary, so examine connectors carefully.
Remember, even if a scan tool reading shows a wrong speed sensor signal, you will still need to inspect wiring and connectors before condemning the VSS. Also keep in mind that some vehicles have multiple, dedicated speed sensors, such as ABS Wheel speed Sensors and Automatic transmission VSS for computer input. So always be sure you are testing the proper sensor!
Performing all of these tests can be confusing, but not taking the time to do them can cost you big! Take your van to your nearest Auto Service Experts for free standard transmission diagnostic and let us examination all of your automatic transmission sensors before you waste dough on automatic transmission overhaul.
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