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neutronranger
New Member
- Joined
- Oct 12, 2016
- Messages
- 25
- Reaction score
- 5
- Points
- 3
- Location
- Minnesota
- Vehicle Year
- 2001
- Make / Model
- Ford
- Engine Size
- 4.0L
- Transmission
- Automatic
I just got a used 2001 Ford Ranger XLT 4x4. I drove it several weekends ago and noted that there was a buzzing noise in the AM radio, but ONLY while the truck was moving. The frequency of the buzz followed the speed of the wheels, not the speed of the engine.
I checked to be sure the frequency of the buzz wasn't engine speed related by shifting into neutral while the truck was rolling and I rev-ed the engine. The frequency of the buzz did not change with engine revs. As I rolled to a stop, the frequency of the buzz got lower and lower until it stopped, when the truck stopped.
Is this a common problem?
Could this be the electronic speedometer signal (PCM speed output signal) I read about in the this tech article?
http://www.therangerstation.com/tech_library/speedometer.shtml
"Starting in 2001, the Ranger gets its raw speed signal from the OSS (Output Shaft Speed) sensor on the transmission/transfer case. The OSS sensor is a magnetic pickup that provides transmission output shaft rotation speed information to the PCM (Powertrain Control Module) where it is corrected for tire diameter and axle ratio.
The PCM uses the OSS sensor signal to help determine EPC (Electronic Pressure Control) pressure, shift scheduling and TCC (Torque Converter Clutch) operation. The PCM outputs the corrected VSS pulse to the speed control and the cluster. In this system the PCM is the correction and distribution point for the VSS signal."
Thanks,
Eric
KAØYWN
I checked to be sure the frequency of the buzz wasn't engine speed related by shifting into neutral while the truck was rolling and I rev-ed the engine. The frequency of the buzz did not change with engine revs. As I rolled to a stop, the frequency of the buzz got lower and lower until it stopped, when the truck stopped.
Is this a common problem?
Could this be the electronic speedometer signal (PCM speed output signal) I read about in the this tech article?
http://www.therangerstation.com/tech_library/speedometer.shtml
"Starting in 2001, the Ranger gets its raw speed signal from the OSS (Output Shaft Speed) sensor on the transmission/transfer case. The OSS sensor is a magnetic pickup that provides transmission output shaft rotation speed information to the PCM (Powertrain Control Module) where it is corrected for tire diameter and axle ratio.
The PCM uses the OSS sensor signal to help determine EPC (Electronic Pressure Control) pressure, shift scheduling and TCC (Torque Converter Clutch) operation. The PCM outputs the corrected VSS pulse to the speed control and the cluster. In this system the PCM is the correction and distribution point for the VSS signal."
Thanks,
Eric
KAØYWN
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