Hello!

I have a 2001 Honda Accord EX V6. Car was running fine from last summer up until a few weeks ago when it wouldn't turn back on. The green key light on the dash does not blink.

A friend and I have both tested the following:

1. PGM-FI Relay underneath dash. Original was old, we tested the 12v and 4v switches on it, and verified the diodes and resistor with a multimeter. Seemed okay.
2. Continuity from the main relay to ground G101 was verified from the Black wire on the relay connector, continuity was present.
3. Fuse 46 in engine bay fuse box, fuses #1 & 13 in driver's side panel were not blown and were receiving power. Verified continuity to the main relay connector and continuity was present.
4. Verified continuity to ground G101 from immobilizer pig tail (brown & black wire) and continuity was present.
5. Verified power to the wires on the immobilizer pig tail, 12v measured on YEL/BLK, 9v on both Blue (Immobilizer enable) and Red (Immobilizer code input).
6. Continuity to ground G101 from the ECU was present.

Swapped out the ECU and ignition lock cylinder assembly with a matching pair, along with a new main relay, and the car ran for a few days before the issue reappeared.

There's no visible damage to the immobilizer pig tail and the harness that goes down through the steering column. I plan on calling the dealership and attempt to get a hold of the brake code.

I'm not a mechanic and my friend is used to working on older cars, so we're kind of stumped at this point. I get the feeling there may be a loose ground on a connector somewhere, but I haven't had much time to chase for one, since the car broke down at a gas station a few miles away.
Any help or insight would be very much appreciated. Thanks!

 

Fuel pump click noise also check the ELD detector has suppliedb12 volts thats on the front passanger side and check for crank signal