I've got a 93 Del Sol that will not run. Fuel pump doesn't prime. The computer isn't activating the main relay. If I ground A7/A8 from the computer the pump primes. I have power at the computer on B1 and A25. Also have grounds at the computer on B2, A23, A24, and A26. Anyone have any ideas what else to check?

 

Interested in the backstory. How did it get to this state?

 

Swap ecu?

 

Just wouldn't start one morning. CEL stays on. Can't pull codes. No spark and no fuel. I tried swapping the ECU. But the one I got is for an Automatic and the car is a standard so I'm not sure if it will work or not.

 

I also Have put a new distributor in because it had oil leaking under the cap.

 

Try it and see if it outputs the logic ground you need.

 

I did. And it didn't. So I'm not sure if the automatic computer just won't work with the standard car or if it's a different problem all together.

 

The computer that came out of the car is a PN: 37820-P28-A01 and the one I got from a junkyard car is a 37820-P28-A50

 

The A7/A8 test rules out the main relay circuit. This^ is almost surely the problem. Swap in a KNOWN GOOD ECU.

 

A7 goes to the main relay but fromt he pinout chart it says A8 is blank.

 

Some have A8, some don't. Not sure why.

 

Yeah this one only has one of the two.

 

The ECU is grounded thru the ground wires attached to the thermostat housing. Disconnect and clean that contact point.

Otherwise it sounds like burned out capacitors in the ECU (like C14) that causes the fuel pump not to prime. Common problem.

Use known good ECU which means you witnessed it started another car.

These 93 del sol ECU's are dying. 21 years old in a leaky humid vehicle.
I know because I have/had a couple of them.

I own them in pairs. LOL

 

Interesting...good to know about C14.

 

The computer has good grounds, the thermostat housing ground is clean and tight. Just have to find a good ECU to try in it. Hopefully I can find something over the weekend to try out.

 

I got another computer over the weekend and tried it out. Fired right up and run great/ Thanks for the help guys