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Welcome To Mopar1973Man.Com LLC
We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features. Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.
Hey again guys.
Picked up a '99 2500 today with a few issues, chief amongst which is the converter not locking up. Overdrive works just fine. I began troubleshooting today, but I could use some input.
It had a bunch of codes before I began measuring, most seemed to be related to the previous owners lockup switch because once I removed the jump between the relay 30 and 87a pins, and installed a relay in its place the codes could be reset and wouldn't come back. Now, according to the previous owner the lockup suddenly stopped working, not gradually. Solenoid assembly is new, and I've checked the contact at the transmission, it looks good and clean. When I measured the TCC cable from the PCM I read 12v at pin 11, contact A2, this didn't make sense so I removed the lockup switch thinking this could be throwing it off due to poor routing and bad handiwork, after this I no longer saw 12v while measuring from pin 11 on A2 to B+. Resistance from pin 11 in contact A2 to B+ was about 0.9k ohm iirc. Oddly enough, measuring from pin 11 on receptacle A2 on the PCM to B+ also results in 12v, which doesn't make sense in my mind. The resistance value from the PCM receptacle was very high, so it doesn't seem like a short circuit.
If for some reason the converter is the problem, I just want to be 100% it's that, to avoid wasting $1000 on a new converter.
Is there any way to see whether or not the PCM is trying to command lockup? If I wire up a new lockup switch and splice it into the orange/black TCC wire as close to the transmission as possible, shouldn't the converter lock regardless of the PCM?