1990 Galant, no injector pulse

[ostlar]

Hi!

I've got a 1990 Galant with a 2,0L 4G63 with the EFI Multi.

I parked it in the garage on Sunday, and just a couple days later, it wouldn't start at all.
It just cranks, with no sign of firing, except with starter fluid.

Here's what I've diagnosed so far:

• It cranks and starts with starter fluid, so spark and air is present, just missing fuel.
  It starts for a bit if I manually set power to the injectors to release the fuel pressure from the rail.
• Fuel pump works, good pressure at the rail
• Sounds like good compression
• Crank sensor in the distributor works
• Injectors are all tested and work individually, but doesn't seem to get any pulse from the ECU.
  They have +12V on pin 1, and the ECU grounds them with the NPN transistors. These seem to have proper ground, I opened and measured them. Unfortunately I don't have an oscilloscope to check the pulses.
• Sensors like the MAF get power, but at 12,5V instead of 5V in the service manual? Weird.
• Diagnostics code is constantly on, which reads ECU fault. This is my main concern.
• ECU has both power and ground where it should
• ECU looks completely fine
• Check Engine Light is on, and does not shut off after 5 seconds as it should
• MPI Relay has power and works as it should, checked continuity

I'm completely lost on what else to check, does anyone have any suggestions?
I might be able to get my hands on another ECU this weekend, I know a guy with Galant parts laying around.

Might also order some capacitors, as they could be the culprit.

[ostlar]

Just replaced the electrolytic capacitors, still not working.
Tried disconnecting every sensor and cable to see if I get diagnostics working, but to no use.

Contacted a couple of people with a good amount of Galant parts, but none of them had any ECU.
However, I've gotten contact info to a guy that does ECU repair, so I might have to send mine to get it repaired.

Luckily my trustworthy L200 still gets me from A to B.

[maddmax]

Perhaps your inquiry would provide more helpful results if you posted it on a Galant website. This is a Mighty Max/ D50 site. Best of luck to you.

[ostlar]

Perhaps your inquiry would provide more helpful results if you posted it on a Galant website. This is a Mighty Max/ D50 site. Best of luck to you.

Yeah I guess so, tried my luck on a VR4 forum. The Galant Center wouldn't let me register for some reason.

I've just concluded that the 5V regulated supply in the ECU has died and lets 12V through.
I wonder how much is broken, hope the sensors on the car are okay..

Probably sending the ECU in this week for repair.

EDIT: The ECU is finally alive again and the car is running, although some sensor inputs are probably fried from the 12V. I'm continuing the thread here: https://www.galantvr4.org/threads/de...circuit.38613/

[dash]

Very methodical approach.... and thank you for follow-up. Kudos. I'm sure you'll get it sorted

[ostlar]

Very methodical approach.... and thank you for follow-up. Kudos. I'm sure you'll get it sorted

Thanks! I hope so, but it will take some time to sort out the errors. I do have lots of time fortunately, not planning any road trip until July.

Luckily my trustworthy L200 takes over as the daily, I'm a firm believer of having at least two cars. Two is one, and one is none.