Hi,
If you question the ignition switch, see of power is maintained at the relay primary when the key is in the start position.
As far as grounds, I do have the ground schematics, but there is a difference between a standard and SE model vehicle. See pic 1.
Let me know what you have. Also, the schematic isn't specific to just the engine. It is broken down throughout the vehicle.
Explain why you feel it is a ground issue. If the relay isn't getting a constant ground via the PCM, that is likely a connector issue or wiring issue. If those two things check good, you will need to check for a ground signal at the PCM. If there isn't one, the PCM likely will need to be replaced.
Let me know which model you have.
Take care,
Joe
See pic below.
Image (Click to make bigger)
Monday, May 8th, 2023 AT 6:27 PM