'02 GTX DI - Bad MPEM
Hi All, I recently acquired an '02 GTX DI on the cheap as it had some known issues and the current owner was tired of dealing with it.
Came to me reportedly with a faulty TPS. Took those off and both tested fine - hooked up a candoo and no active faults(though showed previous tps related faults).
The next day I took it out to run it and the battery was dead flat. Replaced battery and she started up and appeared to run okay, but soon complained about a very low 12v supply.
Debugging showed that when off, there was about a 1.3 amp draw from the battery. I found that the mag side fuel injector was almost always clicking on and staying on when the battery was connected. Removing the AMP #4 connector, the injector would turn back off. Checked between the appropriate pins on the AMP side and the FI connector and found no indication of a short to ground. When the AMP connector was plugged in, I could get a momentary connection to ground from the negative side of the FI connector.
Additional tests conducted:
Fuses all good
Checked stator(appropriate resistance and no shorts to ground)
General condition of ground mounting points good
I am seeing resistance a little high on the FI(2.1 ohms on both at the FI itself, 2.4-2.5 through the harness).
Anyhow from all this I believe that the ground switching relay for the mag FI is faulty inside the MPEM. But before I drop another $300-400 on an MPEM, I wanted to get some second opinions and make sure I wasn't overlooking anything else.
Thanks in advance!