08 ram 1500 4.7L speed sensor
From : jp
Q: i have an 08 1500 quad cab 4.7l 6speed. i installed a pioneer avic-n4 navigation system in it and have not been able to locate the speed sensor wire to finish connecting my unit. any help would be great!!! thanks. ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- .
Replies:
From : steve lusardi
tom to your question no a 20k ohm per volt meter movment would most likely kill the signal. hall effect sensors are driven with a constant voltage that build a magnetic field at the coil in the pick-up head. when the tooth wheel enters the magnetic field some of the field is absorbed by the wheel. this increases the current draw at the source and it is this change of current the amplifier detects. even using a very high impedance oscilliscope probe will attenuate the signal and be very hard to see on the display. in order to use the speed pulse train your signal tap will have to be after the amp. further complicating this is the fact that the schematics and wiring diagrams that i have seen do not identify what circuitry is on the wire ends. perhaps you know how to detect whether a particular pin on a connector is a driver or a receiver i dont but if you know how to do that i would certainly like to know. steve i have never questioned you before but this time i must question whether this will work. if you tap into the sensor lead there is it before or after the pulse amplifier if it is before the signal level is very weak and cannot drive anything but the input to the pulse amp. perhaps i have misunderstood your directions and you are refereing to the output of the amp. well let me ask you this if you hooked up a multi-meter to the sensor and set it to read a/c millivolts do you think the meter would register anything as the wheels turned and if so why do you think the electronics in the nav unit would be any different .
From : tom lawrence
i have never questioned you before but this time i must question whether this will work. if you tap into the sensor lead there is it before or after the pulse amplifier if it is before the signal level is very weak and cannot drive anything but the input to the pulse amp. perhaps i have misunderstood your directions and you are refereing to the output of the amp. well let me ask you this if you hooked up a multi-meter to the sensor and set it to read a/c millivolts do you think the meter would register anything as the wheels turned and if so why do you think the electronics in the nav unit would be any different .
From : maxpower
i have an 08 1500 quad cab 4.7l 6speed. i installed a pioneer avic-n4 navigation system in it and have not been able to locate the speed sensor wire to finish connecting my unit. any help would be great!!! thanks. ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- i see a check engine lite coming on soon!! glenn beasley chrysler tech .
From : steve lusardi
good reason. there is no speed sensor. vehicle speed is computed by a hall effect sensor mounted in the rear differential. that in turn feeds the abs and the chassis computer where the pulse train is measured against time and then divided by a series of divisors for the various outputs like the speedometer and display computer overhead. normally the gps itself measures speed vmg by calculating position change over time. steve i have an 08 1500 quad cab 4.7l 6speed. i installed a pioneer avic-n4 navigation system in it and have not been able to locate the speed sensor wire to finish connecting my unit. any help would be great!!! thanks. ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- .
From : steve lusardi
tom i have never questioned you before but this time i must question whether this will work. if you tap into the sensor lead there is it before or after the pulse amplifier if it is before the signal level is very weak and cannot drive anything but the input to the pulse amp. perhaps i have misunderstood your directions and you are refereing to the output of the amp. steve i have an 08 1500 quad cab 4.7l 6speed. i installed a pioneer avic-n4 navigation system in it and have not been able to locate the speed sensor wire to finish connecting my unit. any help would be great!!! okay... now that all the histrionics are over with lets see if we can actually offer some assistance. the pioneer unit simply wants a pulsed input from the rear wheel speed sensor. while not absolutely required as it can determine speed via gps it does help the system respond more quickly to changes in vehicle speed. given that its designed to go in to a multitude of vehicles it will automatically calibrate itself to determine the pulse-per-minute to vehicle speed ratio again using the gps readings. so in short all you need to do is tap the rear wheel speed sensor wire before it goes into the abs controller. unfortunately the 2008 wiring diagrams arent yet available on dodges site http//www.dodge.com/bodybuilder so youre going to have to wing it with the wiring. examine the connector at the rear differential identify the colors of the wires and find them up at the abs computer connector. assuming they didnt change anything from 06 to 08 youre looking for pin #42 a 20-gauge dark green/white wire. thats the positive side of the speed sensor and probably what the pioneer is looking for. .
From : tom lawrence
i have an 08 1500 quad cab 4.7l 6speed. i installed a pioneer avic-n4 navigation system in it and have not been able to locate the speed sensor wire to finish connecting my unit. any help would be great!!! okay... now that all the histrionics are over with lets see if we can actually offer some assistance. the pioneer unit simply wants a pulsed input from the rear wheel speed sensor. while not absolutely required as it can determine speed via gps it does help the system respond more quickly to changes in vehicle speed. given that its designed to go in to a multitude of vehicles it will automatically calibrate itself to determine the pulse-per-minute to vehicle speed ratio again using the gps readings. so in short all you need to do is tap the rear wheel speed sensor wire before it goes into the abs controller. unfortunately the 2008 wiring diagrams arent yet available on dodges site http//www.dodge.com/bodybuilder so youre going to have to wing it with the wiring. examine the connector at the rear differential identify the colors of the wires and find them up at the abs computer connector. assuming they didnt change anything from 06 to 08 youre looking for pin #42 a 20-gauge dark green/white wire. thats the positive side of the speed sensor and probably what the pioneer is looking for. .
From : jp
no wonder. thanks. good reason. there is no speed sensor. vehicle speed is computed by a hall effect sensor mounted in the rear differential. that in turn feeds the abs and the chassis computer where the pulse train is measured against time and then divided by a series of divisors for the various outputs like the speedometer and display computer overhead. normally the gps itself measures speed vmg by calculating position change over time. steve i have an 08 1500 quad cab 4.7l 6speed. i installed a pioneer avic-n4 navigation system in it and have not been able to locate the speed sensor wire to finish connecting my unit. any help would be great!!! thanks. ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- .
From : jp
ye of little faith... your input was of great value. thank you... -=jonathan p. powell dmd=- www.clockworksdental.com i have an 08 1500 quad cab 4.7l 6speed. i installed a pioneer avic-n4 navigation system in it and have not been able to locate the speed sensor wire to finish connecting my unit. any help would be great!!! thanks. ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- i see a check engine lite coming on soon!! glenn beasley chrysler tech ----== posted via feeds.com - unlimited-unrestricted-secure usenet ==---- http//www.feeds.com the #1 group service in the world! 120000+ groups ----= east and west-coast server farms - total privacy via encryption =---- .