Ssm90gsx
Probationary Member
- 17
- 1
- Jan 6, 2015
-
canton,
Ohio
Trying to continue my diagnosis of this no spark issue I’m having. I blew my motor last fall, and finally rebuilt it and swapped it in.
This issue started out as a no spark on 1/4. Swapped out my coil for a spare and still no 1/4 spark. I checked the wiring at the pigtail of the coil and found one wire exposed and barely attached. I re-pinned a new connector and installed it. Still no 1/4 spark. I then took a break from the car, and came back to find no spark at all, and randomly I will get like one or two pulses from the 2/3 coil.
So today I found a broken wire at the ECU connector for the 1/4 coils, I removed the pin, replaced it with a wire and pin from a spare harness and made sure resistance was less than .1ohm between the ECU connector and the PTU plug. While I had the connectors exposed, I went ahead and checked continuity between the transistor plug and ECU plug. Everything checked out fine.
I’m getting proper voltages at the PTU connector from the ignition switched 12 volt, have a pulse coming from the ECU to the PTU on both the 1/4 and 2/3 wire. The one thing I did notice though, is there is continuity between any ground point, and the 1/4 + 2/3 wire at the PTU plug. I’m at the point where I think my PTU is fried, but with all the other things I’ve found wrong, I believe there to be something deeper. I’ve swapped out a known good 90 ECU with the one I have now.
Any insight would be amazing !
This issue started out as a no spark on 1/4. Swapped out my coil for a spare and still no 1/4 spark. I checked the wiring at the pigtail of the coil and found one wire exposed and barely attached. I re-pinned a new connector and installed it. Still no 1/4 spark. I then took a break from the car, and came back to find no spark at all, and randomly I will get like one or two pulses from the 2/3 coil.
So today I found a broken wire at the ECU connector for the 1/4 coils, I removed the pin, replaced it with a wire and pin from a spare harness and made sure resistance was less than .1ohm between the ECU connector and the PTU plug. While I had the connectors exposed, I went ahead and checked continuity between the transistor plug and ECU plug. Everything checked out fine.
I’m getting proper voltages at the PTU connector from the ignition switched 12 volt, have a pulse coming from the ECU to the PTU on both the 1/4 and 2/3 wire. The one thing I did notice though, is there is continuity between any ground point, and the 1/4 + 2/3 wire at the PTU plug. I’m at the point where I think my PTU is fried, but with all the other things I’ve found wrong, I believe there to be something deeper. I’ve swapped out a known good 90 ECU with the one I have now.
Any insight would be amazing !
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