Need part two please!!! Subscribed for honesty man. Some people wouldn’t show this and with the power of editing no one would know any different. No one learns that way including us watching
For the readers, at about 14:00, this is called a Peak & Hold Injector, you need lots of current to open the injector or any solenoid, but you don't need much current to hold the solenoid open, hence the 2 different and drastic amp requirements. Thanks for your expanation about this system operation, I see there will be more to come soon.
Experience is what you get, when you don't get the results you want. Not a fun or comfortable feeling. Looking forward to part 2. Thank you for sharing with us.
This is what the birth of a great channel looks like. I’m a long term fan of similar long established channels and those guys are chipping in. Keep up the vids man you’re doing good.
Interesting case, I like the diagnostic procedure you use, at first glance it can be seen that you have incredible knowledge, I recently subscribed to the channel, I have already seen all the episodes and I can say, that I have learned very good diagnostic techniques. I will be waiting for the conclusion of this case. Thanks a lot
I wonder if high resistance in injector one is causing the ecm to shut down the command. This is a tough one. Great diag process. This is quickly becoming my favorite channel along with Ivan at Pine Hollow.
Man, oh man! This is a bit advanced for me (I'm not a pro, just a DIYer). Can't wait to see what happens in part 2. Thanks for sharing your knowledge man! Definitely learning from u. Greetings from San Diego CA
Good day sir, thank you very much for the interesting 3-part case study. I know you're well moved on from this one at this point, but wanted to discuss my thoughts. I'm fully confident that I would have made the wrong call at least once while looking at the data in the field and made the same assumptions you did about a shared power-side switch (very common!). I was just checking out all of the waveforms posted on the other video, but the most curious one to me is the original capture with current flow only on injector #1, not on injector #3. Looking at about 12:30 in this video, we are seeing a small amount of current flow when the injector is not supposed to be turned on. I think this is the real indicator of the problem, but it's hard to be sure without having a Sierra of my own around to test. None of the other DI vehicles I have tested ever show current flow from any other injector but the one I have my clamp around, even on the systems with shared power-side switching. Current flow through through injector #1 when injector #3 is firing MUST indicate that injector #3 is using injector #1 as a path for current to flow, as either a power or a ground. Current flow on the injector #3 wire ONLY would probably be low by around an amp or two, but since your current captures went around both injector wires, the currents were added together to look normal. So I actually think your injector #3 was the one with the faulty ground, causing it to find another path to ground through injector #1. Does that make any sense? Thanks again and keep doing what you do, loving the videos.
@@autodiagyt OK seems the fault only occurs above 6k rpm when the INJ 1 command starts overlapping with the INJ 3 command...is this a coincidence? Is it possible that the #1 HIGH driver is bleeding over into the #3 LOW driver enough to slightly increase the amperage over spec? Connector X160 looks interesting...pin 1 (INJ 1 HIGH) is right above pin 7 (INJ 3 LOW)...
Actually if you look at your current trace on INJ 1 High wire, it is NON-ZERO during the #3 injection event... WHY? I thought this was noise at first, but actually it fits the "soft short" between #1 High and #3 Low wires...and would cause an over-current condition on #1 High during overlap
looks like the ecm is shutting injector one off due to high current draw. I would like to see more detail on the green current trace. straight up line before the ramp maybe. very interesting.
At minute 5ish you show connecting chan a & b to the hi and lo of inj 1. At minute 9ish you show connecting chan a to inj 1 lo and chan b to inj 3 lo. The scope display at that time agrees with that setup. At min 13 onward the display is showing the channels connected as 1st shown at min 5. Was that your intention?
almost looks like the capacitor side is turning on but the ground side of the injector is not being triggered. loose injector pin in connector? not that i know anything lol
@@autodiagyt does that technically cause an open circuit on both sides of the injector during the fault? I was wondering what was the activity on the top two waveforms caused by? Its tough getting used to these different injector waveforms on high pressure systems.
Need part two please!!! Subscribed for honesty man. Some people wouldn’t show this and with the power of editing no one would know any different. No one learns that way including us watching
For the readers, at about 14:00, this is called a Peak & Hold Injector, you need lots of current to open the injector or any solenoid, but you don't need much current to hold the solenoid open, hence the 2 different and drastic amp requirements. Thanks for your expanation about this system operation, I see there will be more to come soon.
Experience is what you get, when you don't get the results you want. Not a fun or comfortable feeling. Looking forward to part 2. Thank you for sharing with us.
This is what the birth of a great channel looks like. I’m a long term fan of similar long established channels and those guys are chipping in. Keep up the vids man you’re doing good.
Interesting case, I like the diagnostic procedure you use, at first glance it can be seen that you have incredible knowledge, I recently subscribed to the channel, I have already seen all the episodes and I can say, that I have learned very good diagnostic techniques. I will be waiting for the conclusion of this case. Thanks a lot
The man is awesome.
I think these guys get bonus points with UA-cam if you watch all the way to the end
Can't wait to see pt2. Have to watch this video over to understand the way the circuit is supposed to behave
I wonder if high resistance in injector one is causing the ecm to shut down the command. This is a tough one. Great diag process. This is quickly becoming my favorite channel along with Ivan at Pine Hollow.
Man, oh man! This is a bit advanced for me (I'm not a pro, just a DIYer). Can't wait to see what happens in part 2. Thanks for sharing your knowledge man! Definitely learning from u. Greetings from San Diego CA
I never knew about the boost voltage on these injectors. Thanks.
Loved this video, cant wait til part2!!!
Certainly wasn't what I was thinking, excellent diag!! 👍🇨🇦
@@autodiagyt lol..no will re-watch
Good day sir, thank you very much for the interesting 3-part case study. I know you're well moved on from this one at this point, but wanted to discuss my thoughts. I'm fully confident that I would have made the wrong call at least once while looking at the data in the field and made the same assumptions you did about a shared power-side switch (very common!). I was just checking out all of the waveforms posted on the other video, but the most curious one to me is the original capture with current flow only on injector #1, not on injector #3. Looking at about 12:30 in this video, we are seeing a small amount of current flow when the injector is not supposed to be turned on. I think this is the real indicator of the problem, but it's hard to be sure without having a Sierra of my own around to test. None of the other DI vehicles I have tested ever show current flow from any other injector but the one I have my clamp around, even on the systems with shared power-side switching. Current flow through through injector #1 when injector #3 is firing MUST indicate that injector #3 is using injector #1 as a path for current to flow, as either a power or a ground. Current flow on the injector #3 wire ONLY would probably be low by around an amp or two, but since your current captures went around both injector wires, the currents were added together to look normal. So I actually think your injector #3 was the one with the faulty ground, causing it to find another path to ground through injector #1. Does that make any sense? Thanks again and keep doing what you do, loving the videos.
Nice work
Bravo Just Bravo, very informative keep it up
Realy claver guy.. Hope see more videos.
So far great video.....very little info in direct injection drivers and testing
Ooohhh this is good!! Right with you on calling the ECM... now won't be able to sleep 😅
@@autodiagyt OK seems the fault only occurs above 6k rpm when the INJ 1 command starts overlapping with the INJ 3 command...is this a coincidence? Is it possible that the #1 HIGH driver is bleeding over into the #3 LOW driver enough to slightly increase the amperage over spec? Connector X160 looks interesting...pin 1 (INJ 1 HIGH) is right above pin 7 (INJ 3 LOW)...
Actually if you look at your current trace on INJ 1 High wire, it is NON-ZERO during the #3 injection event... WHY? I thought this was noise at first, but actually it fits the "soft short" between #1 High and #3 Low wires...and would cause an over-current condition on #1 High during overlap
@@autodiagyt Cool...I would try an amp clamp around another known good INJ HIGH wire to see if that small current is normal or not?
What were the misfire counters doing during fault? Default strategy of shutting off fuel to a misfiring cylinder?
looks like the ecm is shutting injector one off due to high current draw. I would like to see more detail on the green current trace. straight up line before the ramp maybe. very interesting.
@@autodiagyt 👍
I thought that was it!!
Where are you located at for repairs. Sam
At minute 5ish you show connecting chan a & b to the hi and lo of inj 1. At minute 9ish you show connecting chan a to inj 1 lo and chan b to inj 3 lo. The scope display at that time agrees with that setup. At min 13 onward the display is showing the channels connected as 1st shown at min 5. Was that your intention?
almost looks like the capacitor side is turning on but the ground side of the injector is not being triggered. loose injector pin in connector? not that i know anything lol
@@autodiagyt does that technically cause an open circuit on both sides of the injector during the fault? I was wondering what was the activity on the top two waveforms caused by? Its tough getting used to these different injector waveforms on high pressure systems.
....Oups
Surprised you didn’t check cam and crank sensors before you called the ecm