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There can be plenty causes when your car’s automatic transmission not shifting accurately. Reduction of fluid, burnt clutches, or any of the thousands of parts make up your car’s standard transmission. How do you know where to begin? Most automatic transmission shops will complete a speedy analysis, in which they look to make sure that your transmission is full of fluid and that the fluid is not burnt.

If the fluid looks excellent they will tell you that they need to pull out the manual transmission to examine visually inside to see exactly what has gone astray on the inner of your car’s automatic transmission.
This happens hundreds of times each day around the nation. The crunch is, it is not the flawless next step. A correctly executed computer diagnostic will often lead to the flawless answer, which is a defective automatic transmission sensor.

Because today’s latest transmissions are electronic as well as hydraulic, they use commands given from the vehicles computer to the transmissions sensors to let the automatic transmission know, at exactly what speed to do a shift. One of the standard transmission sensors that generally fails, is the passenger car speed sensor. Most newer Automobile Speed Sensors are of the permanent magnet classification, and run much the same as a camshaft or crankshaft sensor. The sensors can be mounted either in the manual transmission case or rear differential assembly.

Those in the transmission are most often gear driven, and those in the differential function by using a trigger wheel mounted with the ring gear. Both style sensors go the same task. Driveability symptoms induced by a broken sensor can vary greatly due to the number of tasks the sensor output is involved in. Most auto computers will set related assistance engine light codes for truck speed sensors that malfunction. But what if there are no codes? What should we peer for? First, see if there are multiple systems with concerns that can be related to a damaged speed sensor.

For instance, if our standard transmission is shifting rotten and your speedometer is not working, then you may have a speed sensor problem. So how do we analysis for a suspect VSS? If you have a scan tool available then pull up the VSS value and check for unusual or out of line readings. Follow up with component and wiring tests as needed. First find a resistance value for a new sensor, and inspect for correct resistance across the sensor terminals. Also, inspect for metal contamination on the magnetic pick-up and go over trigger wheel or drive gears for deterioration.

Due to the locations of multitude connectors, water intrusion can also be an predicament, so inspect connectors carefully. Remember, even if a scan tool reading shows an astray speed sensor indication, you will still need to check out 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 Manual transmission VSS for computer input.

So always be sure you are measuring the accurate sensor! Performing all of these tests can be confusing, but not taking the time to do them can cost you big! Take your wheels to your nearest Auto Service Experts for free automatic transmission diagnostic and let us inspection all of your automatic transmission sensors before you waste resources on automatic transmission fix.

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