So after hauling home a new 5th wheel project today, I noticed that my new transmission gauge seemed inop.  I tore down the dash and found the tap splice I used may have had an intermittent connection ( I hate those things) so I switched out a butt connector and that seemed to fix it.  As I was there putting the dash back together, I figured I'd check the trouble codes for fun.  It spit out the following:

 

P0622

P0743

P1693

P1765

 

Now I had noticed wayyy back in fall that the trans had shifted in and out of OD on the highway a few times on a few separate days but quit.  I have since then installed a lockup switch on the dash.  Would the lockup switch cause the codes because you are messing with the transmission signals- so to speak?

I did test the alternator with my MM and got .01- .02 VAC, not alarming. I also read the trouble code trouble shooter on the info pages, but I don't have a scan tool that can freeze frame and what not.  

 

Could it be my 3 day old EZ causing this? I don't know how long these codes were present. 

 

Any thoughts?

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/205-p0622-generator-field-not-switching-properly

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/248-p0743-torque-converter-clutch-solenoidtrans-relay-circuits

 

http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/388-p1765-trans-12-volt-supply-relay-cntrl-circuit

 

I can see the P0743 and the P1765 being possible from your TQ conv lock up switch.

 

P0622 is strictly the alternator circuit.

Mike, I read through those before I posted.  I don't have access to the scanners mentioned in the 0622 process.  I did do some research and I found that some people have had success with re-installing the trans lockup relay and adding a 33 ohm resistor along with the lockup switch mod to keep the rest of the codes from popping up.  Maybe I'll get the ALT tested and check the connections after work.

 

Also, truck drove fine yesterday AM to work, and today to work temps in the 30's.  And on the way home is when it did it, temps in the 50's.

I "Think" that 2000+ need to use the resistor mod & not the jumper. I know my 2001 is loke that. I have heard of some 2000s that go either way. It should remove some codes after clearing with a scanner.

 

Ed

Thanks ED. I'll get the codes cleared an re-install the relay.  I think I have a 33 ohm here somewhere.

"Could it be my 3 day old EZ causing this? I don't know how long these codes were present."

 

I've been running my EZ for 10years now with now problems.

I would say it's not from the EZ

Confirmation on the lockup switch and 33 ohm resistor on the ground leg with relay re-installed. Works like a charm- Now to get the codes cleared and see if they come back.