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F1 code fuel injector problem.

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Old Jul 1, 2024 | 05:17 PM
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Originally Posted by dannoxyz
Ok, that's better ignition-switch. So 9.7v shows up at ECU connector with kill on/off?

Measure resistance between that grn ECU connector wire to chassis-ground, ohms = ???

Is there anything in Lg connector at #12 where grn wire is supposed to go?
If not, move grn wire to that location.

Also very remaining wires on ECU connector is what they're supposed to be:

I will do these measurements when I get home tonight.
On LG connector ECU the is a green wire in #12 as well and it's a ground also with good continuity
 
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Old Jul 1, 2024 | 05:23 PM
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Originally Posted by GB03
I will do these measurements when I get home tonight.
On LG connector ECU the is a green wire in #12 as well and it's a ground also with good continuity
It appears that the green ground on black connector is supposed to be there from factory. I thought about removing it since it wasn't on the diagram to see if it made a difference with the fuel pump
 
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Old Jul 1, 2024 | 07:14 PM
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Originally Posted by GB03
I will do these measurements when I get home tonight.
On LG connector ECU the is a green wire in #12 as well and it's a ground also with good continuity
Trace Lg#12 and see where other end goes and if there's any branches along way.
Do same with Blk#16.
 
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Old Jul 1, 2024 | 07:15 PM
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Originally Posted by GB03
It appears that the green ground on black connector is supposed to be there from factory. I thought about removing it since it wasn't on the diagram to see if it made a difference with the fuel pump
Yeah, try removing blk#16 grn. I can't find it on any wiring-diagrams I have.
 
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Old Jul 3, 2024 | 09:05 PM
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Originally Posted by dannoxyz
Yeah, try removing blk#16 grn. I can't find it on any wiring-diagrams I have.
Yeah, I was thinking maybe I needed to. I was thinking maybe the diagram I had didn't cover all the F4i years is why maybe it wasn't showing. Mine is 03. From why I gathered 01 to 03 should be the same on everything but maybe newer slightly different? Do you have diagrams for all years?
 
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Old Jul 4, 2024 | 11:16 PM
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All I’ve seen are manuals for ‘01-03. Part# for ECU same. Someone did really hack job on your harness.
 
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Old Jul 5, 2024 | 11:58 AM
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Originally Posted by dannoxyz
All I’ve seen are manuals for ‘01-03. Part# for ECU same. Someone did really hack job on your harness.
Okay, I did see a video with 01 F4i and noticed that same green wire on his black ECU plug in same location so just kinda weird they wouldn't put it on the diagram
 
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Old Jul 8, 2024 | 03:34 PM
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Very strange.... Maybe 1st or final year thing.

Also try adding in-line resistor on pink-wire and see if you can it closer to 9.0v
 
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Old Jul 11, 2024 | 10:18 AM
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Originally Posted by dannoxyz
Very strange.... Maybe 1st or final year thing.

Also try adding in-line resistor on pink-wire and see if you can it closer to 9.0v
I hooked up a voltage converter and got it to 9.2 but still not sending power to fuel pump plug. Only power showing on that plug is br/b from res fuel 12.7. getting voltage to fuel injector and ignition coil plugs but no spark. Pulled plugs and coils ground them to engine and hit starter switch and no spark. Ignition pulse generator is brand new.
 
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Old Jul 19, 2024 | 09:03 PM
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Originally Posted by GB03
I hooked up a voltage converter and got it to 9.2 but still not sending power to fuel pump plug. Only power showing on that plug is br/b from res fuel 12.7. getting voltage to fuel injector and ignition coil plugs but no spark. Pulled plugs and coils ground them to engine and hit starter switch and no spark. Ignition pulse generator is brand new.
I jumped fuel pump relay to get power to fuel pump but still no spark. I checked all 4 grounded plug threads to engine and turned it over and nothing. Getting 9.2 volts on pink wire at ECU plug. Ignition pulse generator is brand new. Cam pulse generator getting.506 resistance. What do I need to fix to get spark?
 
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