cruiser54
NAXJA Forum User
- Location
- Prescott, Az
How about the plug at the TCM being cruddy adding resistance to the circuit? Worth checking there.
agreed^^ I'm not ready to condemn the TCU just yet.
Follow the TCU ground wire (D7) and clean it spotless where it grounds first.
Thanks for doing all this digging for me. I tried to disconnect dipsitck grounds and checked d7 for continuity and the voltmeter sill made a chime like. So I don't know:-/
based on those numbers, it does sound like the resistance to ground is inside the TCU. Go back to the TPS and verify that the input voltage is 4.6V if you ground the DVOM to a known engine ground instead of using the TCU ground circuit.
P.S. continuity (beeping DVOM) doesn't necessarily mean that there is no measurable resistance in the wires, but in this case, I don't think that is your problem. Just a thought for the future.
have you considered running an auxiliary ground from the TPS and then setting it using the 4.6V input? It's worth a shot.