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i have been trying to figure out why the speedo is not working in my grandmothers van she has a 1998 dodge ram 1500 conversion van. it had a check engine code for the speed sensor we changed both the sensor in the tail of the transmission and the sensor on the rear diff. speedo still only works intermittently it never shows the actual mph and is moving around alot like say if im really doing 45 the speedo is showing around 20 to 40 mph bouncing around in that range it sometimes cuts out completely as well. the abs light and brake lights are not lit. the check engine light is still coming on but my code reader claims no codes in the computer when i attempt to read it. what should i look at next?
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update i followed the wires from the rear speed sensor up to this computer module near the brake lines i think it may be an abs module and verified the wires are not broken between the sensor and this module using a volt meter but i do not know what path the wire takes after leaving that module as i cannot locate any kind of pinout of that module anywhere.
does anyone have acces to wiring diagrams for the 1998 dodge ram 1500? im looking for a schismatic for the abs rwal module with pinout of the connector if possible. im trying to figure out what wires would have to be jumped to allow the speed signal to bypass the abs module and go strait to the cluster.
ok updates ive found pinouts but not sure what wire to jump into the pcm. there is 2 wires from the rear sensor coming to the abs module a + signal and a – signal. the abs module then sends out a singal speed signal to the pcm but is that signal + or – the wiring diagrams are not telling me this.
well ive learned the signal form the speedo to the abs from the abs to the pcm is all different ad if i bypass it it would likely fry the pcm so back to square one. i tore the dash apart the other day looking for a broken wire or corroded connector and i only found one spot with corrosion although not very much and i soldered jump wires with a new connector around the original connector to bypass the corroded pins in the connector. and still after all that work the speedo is still not working correctly it has 0 effect on it. i learned of a self test and did the self test on the cluster and all the needles and lights worked as they should through the test. im lost as to what the issue is im about to buy a gps to stick in the window and tell them to use that for a speedo.
I don’t know about a 1998 Dodge Ram, but my 2007 had this problem. I found after taking my differential cover off that the spider gears had been chipped. Then I noticed that the “Tone Ring” was missing half of it. A piece of metal was magnetized to the sensor. So the sensor wasn’t reading a pulse, so it thought that it was sitting still. Replaced tone ring, plus my spider gears. All is well with the Dodge Ram now. Hope this helps
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