Hi, it's likely that a speed sensor, either the input speed( turbine speed, tone wheel attached to the input assembly) or the output speed sensor ( tone wheel on the rear carrier) , or electrical circuit have developed a fault, speed sensors are located on the front side of transaxle on each side of the solenoid pack . The TCM calculates the signal for MPH and sends this info to the MIC ( mech. instrument cluster) and PCM over the "bus"( a data stream ). When this valuable info is lost the TCM goes into a limp-in mode and does not allow the solenoid pack to operate by removing the power via the EATX relay..........
This is usually one of two things. Sometimes it is a fuse that is blown. Check all of your fuses with a test light or multimeter. The other problem associated with this is the headlight switch.
The tcm is ok if the transmission shifts. You can take it to Autozone and find out what codes are problems. But the speedometer comes from speed sensors in the transmission. But I think that they are also working properly if all of the gauges went out at the same time. I don't think it is a fuse because the temp would not work either. It still sounds like a fuse to me.
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all the gauges are out on the dash including the gas gauge and temp also the digital readout mounted on the roof of the van has no readout except temp reading for outside air does the tcm control this and how do i check it the trans shifts ok so it must be reading info from main computer can i get codes for this from autozone or advance auto also i dont understand some of your termanolgy like auto tube or what ever where do i start checking for a short thanks i need very simple instructions for this
eatx relay where is it and how do check it also where is the tcm module located in the engine compartment ive heard you can reset the tcm by letting the car warm up then shutting it of and taking the the key and turning it off and and on 4 times does this reset the tcm
all my dash gauges are out and speed and odometer how do check the dash assembly or is it getting info from whatever does the tcm send info directly to the dash 99 dodge caravan 3.3
ok ty but where is the fuses that ctrl the gauges and please explane how to check the headlight switch what am i looking for ive heard the intire dash can go out how do i remove the dash and check input to nthe dash gauges and speed and odom
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