delsol2423

So frustrated

So far I have replaced the main relay, rebuilt the dizzy (icm and coil), all fuses are good. When I jump the wiring harness for the PGM relay the fuel pump primes. There is 16V going to the harness to the fuel pump. Clueless as to why it doesn't turn on. There is power going to it and the relay is new, should work?

I also cleaned the thermostat ground. The ecu is a p28 and I switched up the ecu to one from my teg which is a p08 modded to a p28 (which should work?)

I don't want to tow this car to a mechanic yet, still hopeful.
Any suggestions?

delsol2423

Is the next step replacing a wiring harness when every other possible things fails

Former User

You MUST provide all pertinent information about your car and engine. Failure to do so may result in thread closure.

delsol2423

1993 honda del sol 1.6 v-tech (d16z6 engine?)

Former User

Reason for frustration --> Your strategy for fixing the problem seems completely reliant on somewhat random replacement of parts (main relay, distributor) that have not been tested.

What main relay connector terminals did you jump for this^ test? You should do two separate jumper wire tests -- jump terminal 1 from fuse 31 and terminal 5 from fuse 24 [key in ON(II)] to terminal 7 that runs to the fuel pump.

Here^ you now seem to say that the fuel pump does not run even though it gets voltage, which contracts what you just said above. Which is statement is correct?

And why is your system voltage (16V) so high? Battery voltage should be about 13V.

delsol2423

main relay was bad (bench test) and yes the distributor was a guess
and yes did both jumps and it primes
I read voltage from the harness that leads to the fuel pump. maybe its a bad ground?? Fuel pump doesn't prime on its own.

I found a fuel pump circuit diagram step by step so I ran through the circuit and everything checks out fine (no open circuits, continuity good). It might be the ECU, I am going to borrow one and see what happens. Although, the SOHC del sol has a p28 and I tried a p08 modded to a p28 (from my DOHC integra) already and it didn't run. Would the car not even start with the other ecu just due to a compatibility issue?

grumblemarc

iTrader: (4)

Wrong assumption.

Former User

This^ test tells you that the fuel pump ground is fine.

This is worth trying if you have access to a known good ECU, though there are more tests to do before you should conclude the ECU is bad.

To avoid wasting time suggesting tests that you've already done, give details about these^ specific tests and how you did them.

delsol2423

Did the k-test and ecu was reading 2V, borrowed ecu and now reading 9V for the k-test. So strange, should only be 5V.

I ran through a test I found online: checked for continuity between black terminal 2 and body ground. Measured voltage between YEL/WHT terminal 1 and body ground. Measured voltage between BLK/YEL terminal 5 and body ground (ignition switch on). Ignition switch in start position measured voltage between BLU/WHT terminal 6 and body ground. Checked for continuity between GRN/YEL terminal 8 and A7. Measured voltage between A23 and A25,B1. Measured voltage between A7 and A23.

delsol2423

Anyone have a clue why I would be reading 9V from the map sensor to the thermostat ground when it should only be 5V? Does that sound like a shorted wire somewhere?

delsol2423

If anyone is going through the same problem...
Finally figured out what the issue was the ecu ground wire itself was bad. The relay was also blowing a fuse.