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An update... sent in my MPV2 module for testing & verification (need to update the ram and do not trust the MPV2 module), requested a JTEC module be included in that testing. Should hear back more next week
Another update... Spoke with HPT on the testing results of my MPV2+ and it works as expected. That leaves the truck as the issue. I apparently lost my OBD port connector which was going to simplify the bench setup so I'll have to go get another one. I brought the original ECU & harness into work so I get to stare at it daily as a reminder.
Have not given up on this, just dont have the bandwidth to give it the attention it needs.
It could not find the VINs in the ECU... the UI asked to enter the vin manually which I did, then it erased the ECU and could not write to it. So it has been on the sidelines since. I need to update the Ram and have no confidence in the MPVI2+ so I shipped it to HPT for testing. They state it works as expected on a JTEC ECU. So the problem is the trucks ECU or the wiring between the OBD port and the ECU. My next step is a bench setup to bypass the truck, just dont have the bandwidth to get it done just yet.
Edit: when I say I lost the obd port connector, I mean I picked one from a wrecked truck for the bench setup and cannot find it.
He was a wiring guru of all kinds that we lost to spinal cancer last month.
I just made a JTEC bench harness for testing one of my products on. It's a 2000 PCM using CCD bus, so I ran the ISO 9141 K-Line from the PCM to pin 7 of the OBD port, and everything works for telemetry.
He was a wiring guru of all kinds that we lost to spinal cancer last month.
I just made a JTEC bench harness for testing one of my products on. It's a 2000 PCM using CCD bus, so I ran the ISO 9141 K-Line from the PCM to pin 7 of the OBD port, and everything works for telemetry.
THANK YOU! the schematics are way easier to read than whats in the manual...
The ECU is a JTEC ecu, has the 3 plugs on it. I am out for the next month (3 weeks vacation followed by a week in the sun down in Phoenix for work) so it will be a bit before I can get back to this. The wiring diag simplifies making the bench setup for sure.
I bought a used 2002 4.7 Dakota Club Cab SLT in 2014. Had some issues that I worked through and thought all was well. But occasionally I would get codes, bad performance, etc. Replaced the CTM and got the top end refreshed (heads milled, tappets, etc.). It resolved a few things but still had some irritating bugs. Replaced plugs, Air Idle Speed, Throttle Position Sensor, and ignition coils just to name a few. Still had issues and even the Dodge dealership blamed the AIS or TPS. I get most parts from RockAuto. Ignition Coils listed there were supposedly perfect fit. Bought a pack and still had issues. I had previously ordered all Dakota manuals from Dodge I took my time patiently reading through them and bingo, found the culprit. The applicable 4.7 ignition coils are unique to just that engine (e.g., primary and secondary resistance). Searched high and low and found the right ones at Denso Auto Parts. Haven't had an issue since other than a failed alternator.. I still trust and buy from RockAuto... may just cross-reference with my manuals sooner. Attached are two pics from the manual.
The highlighted box is what I originally missed. This was my guide so I could validate I was connecting with the correct resistance.
One of the first things I did was put in a set of new plugs... a few thousand miles later I noticed a mis-fire under certain conditions. Cleaned up the old plugs, re-gapped them and put them back in. No more mis-fire but one plug looks wonky when pulled (#2 cylinder). So I grabbed a spare coil off an engine at the yard but have yet to put it in. Your comment makes me wonder if the coil that is in there is aftermarket and not quite up to the task...
06-30-2022, 09:34 AM
