Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
changed speed sensors , shift solenoid ,transmission computer ...still in limp mode with all gear indicator lights on checked power and grounds to tcm . doesn't seem to be turning on trans relay
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer." I have learned more by being wrong, than I have by being right.
I checked continuity between the pcm and tcm on the white black and violet tan wires and it was good, Started truck and got a voltage reading of 2.5 vdc on each wire .. its suppossed to be 4.7 .. im not sure what the next step is in finding the low voltage issue . the wires go from the tcm into the wiring bundle going down firewall and return at the pcm
yeah Im not sure what pin to check for voltage at the data link conn I think its pin 16 but unsure if its labeled or if thats the right spot to check all abs and other functions are normal with no codes just the p1698
im working on this truck for my teenage stepson a friend at work brought it to me to try to fix because he gave up on it it but its been a real challenge and i dont give up easy in the mean time ...Ill try not to shoot it full of holes . Im not a big dodge fan so its all new to me thanks for the insight it really helps
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer." I have learned more by being wrong, than I have by being right.
I dont have a DRBIII scanner I did check the ABS connector and had the same 2.5 volts on the pins with the white black and violet tan wires . does this mean I need a new PCM or is there another way to verify the PCM with a volt meter or obII scanner . I noticed a P1687 code that just popped up also but I assume thats from my testing I did . not sure
Step 4 in the chart is really the determining step to determine if the ccd bus is messed up. You could possibly use a voltmeter on the pci bus wire but you won’t see detail like you would with a scope. Then again you could do it in 2 places again and compare what you get. I’d check powers and grounds at pcm before calling it though
flow chart from jreardon post 3419 says if you have 2.5v on terminal 3 (vio/brn) wire and terminal 11 (wht/blk) wire you have a short between the two wires somewhere. Terminal 3 should be 2.45 and terminal 11 2.47
look for contact points on the wiring loom... where loom comes in contact with metal. do this before you start pulling wires apart or you may loose finding the contact first. keep your DVOM connected and touch the loom at possible contact points and watch the DVOM for any voltage change.
"an open mind let's knowledge flow in and wisdom flow out for a man who has neither never listens to those who have both".
Being wrong doesn't bother me, it's being right and not understanding why that does
I checked the Data link connector at pin 3 and 11,both had 2.5 VDC.same as all other spots checked .. not sure if this is a good reading or is it supposed to be the 4.7 vdc reference at the spots checked . there are no other issues with the truck other than the limp mode condition of the transmission .. it starts and runs normal so Im still unsure If I need to pick up the pcm from the junkyard and try it or not
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