Question about Volvo S70
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Posted on Jan 02, 2017
SOURCE: where is the output speed
The problem is either vehicle speed sensor or wiring harness going to sensor. In some case the ECM is defective.
Ensure that you have already replaced the VSS with good ones.
If you have not replaced them yet, then the sensor can be tested reading the waveform. This is done connecting both VSS input and output wires to a machine. The one below is a good VSS wave at 37 mph:
If the waveform is incorrect, the sensors must be replaced, as the ECM returns P0722 when VSS output is incorrect, or when there is no output.
A second test can be done reading the sensor impedance and voltage. Connect a multi-meter to the sensor. Set first on Ohms reading (impedance). A good sensor will read 560-680 Ohms at 20C (68F).
Set multimeter on Volts. Touch rapidly the sensor with a magnet and pull magnet away. The sensor will emit a weak voltage pulse. If that does not happen, then the sensor is broken. Ensure that multimeter is on high volt scale.Voltage will be quite low:
The VSS are located on the wheel shaft. Here a picture:
The VSS is connected to the ECM.
If you have already replaced the sensors you need to check the wiring harness to the ECM.
The wiring harness is tested checking that each wire going to the ECM has continuity. This is done reading impedance between each connector in the sensor , and the respective connector in the ECM. Impedance must be zero or a very low value. If it reads infinity, then the wire is broken.
A second test is done reading impedance between the two different wires at ECM connector. Impedance must be the same as at VSS contacts on sensor. If impedance is zero, then there is a short. Ensure that you choose a proper Ohms scale while doing the test.
If you have already replaced the VSS, repair or replace the wiring harness. The ECM failure returning this code is very uncommon. At most you may have a defective ECM connector.
Posted on Apr 19, 2011
SOURCE: volvo s70 radio code
You must take the car to a Volvo dealer so they can reference the code from the VIN number. If you call it in, they only assume you stole the radio. Sometimes you have to prove you own the car.
Posted on Oct 31, 2008
SOURCE: 1999 volvo radio code
To reset the radio you have to leave the key in position one (the radio will come on, but the dash lights are not on) with the radio on for at least two hours. It can take up to four hours to reset.
Make sure the climate control and blower are in the off position to keep the battery from running down. Eventually the radio will say "code". There is a four digit code that is unique to each radio, if you don't have it you must contact the local Volvo dealer and have your VIN code. The VIN code is locate on the far top/right side of the dash, you must be outside the car to see it. It will begin with something like YV1LS...................
When you get this code from the dealer you input the code using the radio preset (1-6 buttons). If the radio says code again that means it is the incorrect radio code. Most likely the radio has been replaced. Then it would be alot easier to take it to the dealer since the radio has to be removed and the serial number taken off the radio chassis unit. Usually most dealers will do it for free if they think you'll come back for services, so just tell them you just bought it and be nice, hopefully it will work.
hope this helps
Posted on Feb 25, 2009
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