Scan tool tells me that it is a vss (vehical speed sensor )
wherei s it located? and is the sensor part of the abs sysetm on the wheels? or has it got a sensor on the diff. some where? There looks to be no sensor on the gear box, apart from the crank sensor.
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Re: volvo s40 98 modle speedo not working
Hopefully your crank sensor is not located on gearbox as you placed it in your post! VOLVO puts their VSS on the inboard side of an output shaft, usually. You should be looking at the axles, and the holes in the transaxle they extend out of... There will be a sensor reading the inner end of one of these output shafts (axles.) This is your VSS. It operates independently of your ABS, but its accuracy is vital to the ABS's proper function. Its reading is used for many things in the car, not the least of which is speedometer readout. Hope this helps, let me know if you don't see it, I'll get you a more exact location if need be, but if you look carefully, you'll find it. It's reading the speed of one of those axles, but not at the wheel, at the transaxle, get it???
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Did you have it check for DTC'S - diagnostic trouble codes ?
The speedometer is an analog gauge that is located in the instrument cluster. The PCM/VCM receives an analog input from the vehicle speed sensor and converts it to a digital signal containing 4,000 pulses per mile (PPM) for the instrument cluster.
The PCM/VCM sends this digital output (4,000 PPM) to the instrument cluster on a designated circuit. These pulses can be measured in Hertz (Hz) using a digital multimeter (DMM) on the AC scale. The PCM/VCM calibration is matched to the final drive and tire size of each vehicle. If the final drive or tire size is changed for any reason, the PCM/VCM must be updated in order to match the new final drive or tire size. If not, the signal will not be accurate for proper speedometer/odometer operation. An incorrect signal can affect the antilock brakes and the cruise control systems.
The speedometer system consists of the instrument cluster, vehicle speed sensor (VSS), PCM/VCM and related wiring. The VSS is a permanent magnet signal generator that sends an analog signal proportional to the propeller shaft speed to the PCM/VCM. The VSS mounts to the transmission tailshaft extension housing on 2-wheel drive (2WD) models and the transfer case output shaft housing on 4-wheel drive (4WD) models.
Repairs to the instrument cluster can only be performed by an authorized instrument cluster service center.
DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Input and DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent in Automatic Transmission - 4L60-E
- DTC P0500 Vehicle Speed Sensor (VSS) Circuit in Engine Controls - 4.3L
Important: If the instrument cluster is completely inoperative, refer to Instrument Cluster Inoperative .
Install a scan tool.
Raise the vehicles drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
Start the engine.
Place the transmission into drive for automatic transmission and third gear for manual transmission.
Compare the displayed vehicle speed on the Instrument Cluster with the monitored speed on the scan tool.
Does the vehicles speedometer and the scan tool both display 0 km/h (0 mph)?
You really need a Factory scan tool or equivalent to check this . The VSS is an input to the PCM/VCM . engine computer . You can test with a DVOM - digital volt ohm meter , for signal to engine computer .
I know most people don't like hearing this , but I suggest you take it to a ASE certified repair facility .
there are many on some cars 5 or more.
what engine,? what transmission?
1: crank shaft rpm CKP sensor.
2: VSS 1 tranny front sensor Automatics.
3: vss 2 tranny rear. """
4:speedo back up VSS to vss 1.
5: cam speed, or Angle.
why not say the symptoms and why VSS is on your mind.
did you use a scan tool, if not why not?
the scan tool will tell you which sensors readings are wrong
and just because one is, dont mean the sensor is bad.
the PCM /ECU never knows what is bad, ONLY what tests
failed (called monitors) and its the job of the technician
to do the FSM tests. and find TRUE CAUSE.
The vehicle speed sensor or VSS is located on top of the transmission, on the output shaft. This sensor provides input to the speedometer on instrument cluster. There are also 4 wheel speed sensors (one on each wheel). Their primary function is to detect wheel speed to control ABS.
This is a common issue, and is pretty easy to fix. There are ABS sensors on the wheels, and you have a bad one. Usually the wires become corroded, and are easy to spot. The unit is on the back side of the wheel assembly.
A faulty VSS (Vehicle Speed Sensor) or related wiring can cause both of your problems, trans and ABS. If the computer doesn't know the vehicle is moving, then it won't shift the trans. If the ABS controller sees wheel speed, but not vehicle speed, it will turn on the ABS light. The VSS is located in the rear transfer case housing. But remember, it may be the VSS, related wiring, a faulty speedo buffer (usually located in the dashboard), ECM, or even the reluctor on the transfer case output shaft. You may want to have a shop scan "data stream", or even have them diagnose the problem.
The code is for the Vehicle Speed Signal (VSS). The VSS is produced by the ABS electronic control unit by averaging wheel speed sensor inputs and sending a digital signal via CAN bus to other modules that use the VSS. To test the ABS, a Volvo-compatible scan tool is necessary. If one is not available, the car should be sent to a Volvo dealer for ABS diagnosis.
I can tell you however that most of the cars are fixed by replacing the ABS Control Module.