MDK87
Probationary Member
- 6
- 0
- Jan 12, 2010
-
Brisbane,
Australia
Hi lads, first post here after many years.
I've done a heap of searching and come across a few threads on here with great advice and instruction, however none of it has cured this problem.
I've got a pre-facelift GVR4 running an MD165808 (Jap-Spec RS) ECU. Pins 6 and 14 have already been swapped.
The car starts and runs, so the fuel pump is working and as such, I've ruled out the MPI relay but I went ahead and replaced IC109 driver IC anyway. Car still showed the CEL.
Had a look at the schematics and found that it's basically a feedback signal to tell the ECU that the fuel pump has power to it. Idk why that wasn't done internally off of pin 56 but anyway.
So I measured pin 13 with the car running, only 5V.
Found Steve's advice on some other threads here advising to connect pin 13 to ign 12V, so I did that. Traced the track back to diode D4 and measured 12V at it's terminal, so the track isn't o/c between there and the pin.
Reset the ECU, but the same DTC still shows up.
From that point, the circuit gets a bit out of my league. I'm starting to think that I'm going to have to forfeit the ECU, which kind of sucks because apart from the DTC, it is in completely working order. Has already been socketed, caps and bust M5269L drivers replaced (car idles great now!).
Besides, I would like to know what could cause that problem so that I don't ruin another ECU by throwing it in blind.
Any advice would be greatly appreciated.
Cheers.
I've done a heap of searching and come across a few threads on here with great advice and instruction, however none of it has cured this problem.
I've got a pre-facelift GVR4 running an MD165808 (Jap-Spec RS) ECU. Pins 6 and 14 have already been swapped.
The car starts and runs, so the fuel pump is working and as such, I've ruled out the MPI relay but I went ahead and replaced IC109 driver IC anyway. Car still showed the CEL.
Had a look at the schematics and found that it's basically a feedback signal to tell the ECU that the fuel pump has power to it. Idk why that wasn't done internally off of pin 56 but anyway.
So I measured pin 13 with the car running, only 5V.
Found Steve's advice on some other threads here advising to connect pin 13 to ign 12V, so I did that. Traced the track back to diode D4 and measured 12V at it's terminal, so the track isn't o/c between there and the pin.
Reset the ECU, but the same DTC still shows up.
From that point, the circuit gets a bit out of my league. I'm starting to think that I'm going to have to forfeit the ECU, which kind of sucks because apart from the DTC, it is in completely working order. Has already been socketed, caps and bust M5269L drivers replaced (car idles great now!).
Besides, I would like to know what could cause that problem so that I don't ruin another ECU by throwing it in blind.
Any advice would be greatly appreciated.
Cheers.