Question about 1999 Volvo S70
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Posted on Jan 02, 2017
SOURCE: where is the speed sensor
Is your ABS light on? This is usually a fault of the ABS control unit located under the brake proportioning valve. Speed sensors are located on the back side of each brake disc That info is sent to the ABS control unit then to the main computer. Is your ABS light on? This problem could be caused by bad sensors or more likely the ABS control unit.
Posted on Sep 12, 2011
SOURCE: Volvo P0717 Input Speed Sensor
The P0700 is not a true fault code, it just means that the powertrain control module has requested the Transmission control module to turn on the check engine light to alert you of a fault. The P0717 is the one you need diagnosed, it is the real problem,.
Posted on Jun 12, 2012
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The computer wants to know if the transmission is working properly. So it reads the speed of the input shaft and compares it to the speed of the output shaft. It knows which gear you're in because it commanded the transmission to shift into that gear. So, with the input speed, the gear selection, and the output speed, the computer can calculate how efficiently the transmission is working. If the speed is off, it knows that something is slipping inside the transmission. It can then try to boost the fluid pressure to compensate. If that doesn't work, it sets a different trouble code.
The P0717 code means that the computer isn't getting any signal from the sensor. Either the sensor is dead or there's a circuit issue (bad wiring, etc).
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