ok so 96 2500 4x4 47re auto
tps is good and has been modded to a potohmeter
also have a lock up switch
all guages work except my coolant(was told this only controls gauge does not go to pcm is that true)
cruise control works
speed works
i put it on a scanner no codes but says my engine coolant is at -40deg hence no gauge working
so driving the truck tranny shifts normal 1-2-3 then lock up never even tries to shift to 4th tranny does not slip fluid is clean and fresh the dash button works but only unlocks the converter for a few seconds then locks back to 3rd tells me it works
lock up switch with od on or off works but only locks 3rd
i searched alot and came up with
it could be coolant temp sensor
tranny temp sensor but its in the trans
a little black box on front of the block i think its the ess
or the od solonoid itself ( this is what i suspect)
so how can i figure out what it is without buying all new sensors
any help is greatly appreciated
thank you
tps is good and has been modded to a potohmeter
also have a lock up switch
all guages work except my coolant(was told this only controls gauge does not go to pcm is that true)
cruise control works
speed works
i put it on a scanner no codes but says my engine coolant is at -40deg hence no gauge working
so driving the truck tranny shifts normal 1-2-3 then lock up never even tries to shift to 4th tranny does not slip fluid is clean and fresh the dash button works but only unlocks the converter for a few seconds then locks back to 3rd tells me it works
lock up switch with od on or off works but only locks 3rd
i searched alot and came up with
it could be coolant temp sensor
tranny temp sensor but its in the trans
a little black box on front of the block i think its the ess
or the od solonoid itself ( this is what i suspect)
so how can i figure out what it is without buying all new sensors
any help is greatly appreciated
thank you