Hi,
When you say you took a jumper wire to the starter, are you doing that at the starter motor or the starter relay? Also, and I doubt this is the issue because you said it cranks, but what you described happening sounded like the battery was getting weaker and weaker. Have you confirmed the alternator and battery are good?
As for the communication issue, I need you to check two things.
On the DLC, pin 16 should have 12v power at all times. Confirm that this is the case. Pins 4 and 5 should provide a ground path. Check them for continuity to ground. (See pic below)
Also, there is a main ASD relay located in the relay box near the power distribution box under the hood. That will prevent the engine from running if it has failed. It shuts the fuel system down. Check that as well. Also, here is a link you may find helpful for testing a relay. (see pics 2 and 3).
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit
The more I think about how this happened, I really feel it was a voltage loss issue. These vehicles are very sensitive to voltage changes. If it gets low, all kinds of things happen. LOL I miss the old days. When you jump it now, does the starter sound weak or does it sound normal?
Let me know what you find.
Take care,
Joe
See pics below.
Images (Click to make bigger)
SPONSORED LINKS
Monday, September 12th, 2022 AT 8:33 PM