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Old 05-18-2018, 04:35 PM   #51
ZVOLV
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Originally Posted by PromiseRing View Post
NO the ecu powers up the FPR which powers the RSR.


That's what I believe to be the case also. That's why I changed my test recommendation to what I just said in post 49.

Unplug the ECU and then power up the injector positive side of the circuit with one of several methods such as a jumper wire, a power probe, or my preferred method: open the relay and pinch the contacts closed.
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Old 05-18-2018, 07:31 PM   #52
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Well, I tested the resistance to the injector positive wire with the ECU connector removed, so I assume it's wiring-related.
I opened up the harness and found the covering on the part where the injector ground wires combine was split and the bare wires were exposed. That doesn't explain why they were getting power, though, since none of the other wires were damaged. However at that point, there was no continuity between the injector positive and ECU pin 13.
Tomorrow (if it isn't raining AGAIN) I'll pull apart each individual injector harness and make sure there isn't any damage.
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Old 05-19-2018, 03:12 PM   #53
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Pinched the fuel injector relay and I have voltage with the ECU disconnected.
After putting the harness back, I still have ~9 ohms on the injector control to ECU pin 13. I realized after disconnecting ALL of the injectors, it went to open circuit. Once I plug in one injector, it goes to 13-14 ohms, and decreases as I continue to plug in each injector.

I tested resistance on the cylinder 1 injector (I'll test the others once I have some specs) and it showed ~2.5 ohms. What kind of reading am I supposed to see?
It seems that maybe my injectors are the reason there is power at both terminals.
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Old 05-19-2018, 03:26 PM   #54
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Doh! Yeah there will be 12v on the injector negative if it's plugged in!

Keep searching.
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Old 05-19-2018, 05:01 PM   #55
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Okay, so there isn’t a problem! I was just driving myself nuts trying to figure that one out.
So maybe it’s just my ECU? I don’t know what else it could be.
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Old 05-19-2018, 05:27 PM   #56
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Well you also said it doesn’t run off of starting fluid right? So there’s more than one issue at stake here.
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Old 05-19-2018, 06:18 PM   #57
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Well you also said it doesnít run off of starting fluid right? So thereís more than one issue at stake here.
That may be because of the ignition timing. I haven't adjusted it since replacing the distributor, for obvious reasons. I'm really not concerned too much with that right now... I'm concerned about the lack of injector pulse.

Now... I'm just realizing, shouldn't the injectors have less than 12 volts because of the resistor?
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Old 05-20-2018, 11:42 AM   #58
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Bypassed the RSR, no changes.
Iím really thinking I just have two dead ECUs. Thereís nothing else I can think of that could be wrong. Although it seems weird that injector pulse is the only thing not working on this ECU.
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Old 05-20-2018, 04:52 PM   #59
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What reasons would LH 2.2 have to prevent injector pulse/ground? I canít think of anything at all.
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Old 05-20-2018, 09:51 PM   #60
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What reasons would LH 2.2 have to prevent injector pulse/ground? I canít think of anything at all.
Quick question, what are the last 3 numbers on your ECU?
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Old 05-20-2018, 11:12 PM   #61
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Quick question, what are the last 3 numbers on your ECU?
Last 3 are 541.
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Old 05-21-2018, 12:22 AM   #62
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Okay just making sure. AFAIK that’s the only lh2.2 turbo ecu (could be wrong). And I’ve read they’re extremely reliable. I doubt either of your ECUs are bad.
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Old 05-21-2018, 09:34 AM   #63
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I was reading more last night, and I agree, they’re probably both fine. I found a thread with an issue similar to mine, but as usual the OP never posted the solution...
I read something about the ignition coil continuity to ECU pin 1, but I can’t find the page. I tested that and found high resistance, over 1,100 ohms. After looking at the diagram though, I don’t think there is supposed to be a connection. Anyone know about that?
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Old 05-23-2018, 01:34 PM   #64
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I read somewhere that pin 18 on LH 2.2 should be grounded... and when tested, it shows about 14.5 ohms to ground, not too good if it's supposed to be grounded. I assume the 4/15 shown on this diagram is referring to terminal 15 on the ignition coil?

https://photos.app.goo.gl/meSjdYy8y2MTYSYR2
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Old 05-23-2018, 03:19 PM   #65
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What does the legend say?

Why would a power wire go to ground!? Do you have power on pins 18 and 9? Is that diagram LH 2.2?
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Old 05-23-2018, 05:26 PM   #66
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What does the legend say?

Why would a power wire go to ground!? Do you have power on pins 18 and 9? Is that diagram LH 2.2?
Well, I thought the same thing, but both injector wires have power, don't they?

Pins 18 and 9 both have power. ~11.94V at 9 and ~12.12 at 18. Strange there is discrepancy in voltage, albeit a small one.

Yes, the diagram I posted is LH 2.2 B230FT.
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Old 05-23-2018, 06:46 PM   #67
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Well, I thought the same thing, but both injector wires have power, don't they?

Pins 18 and 9 both have power. ~11.94V at 9 and ~12.12 at 18. Strange there is discrepancy in voltage, albeit a small one.

Yes, the diagram I posted is LH 2.2 B230FT.
One of the wires for each injector is switched to ground by LH2.2. The other is connected to 12v through the rsr.
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Old 05-23-2018, 07:16 PM   #68
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One of the wires for each injector is switched to ground by LH2.2. The other is connected to 12v through the rsr.
Yes, I am aware. The problem is that LH is not grounding that wire.
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Old 05-24-2018, 11:30 AM   #69
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As I have said, you confirm power , ground, and signal to a computer before condemning a computer.

I can think of many tests. I have a $80 oscilloscope which is about the cost of one or two missed shots with the proverbial parts cannon.

With the scope I would confirm a clean square wave from the hall sensor into the EZK box.

Next I may jump over to the LH box and see if it's pulling the injectors to ground. I would be doing my checks directly at the LH box which would eliminate any problems with engine bay wiring.

Or lower tech would be the damn test light. Your thread title is no injector pulse. Connect test light to a positive source, connect the other end poked into the back of an unsheathed LH connector at the injector control terminal. Blink?

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Old 05-24-2018, 12:12 PM   #70
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I’ll see what I can do about testing that the ECU is grounding the injectors. I’m pretty sure the EZK is getting a good RPM signal from the hall sensor. It’s a new sensor (yeah yeah, I know that doesn’t mean much) and if it wasn’t getting a reading, I likely wouldn’t have spark.
Now, whether that signal is getting to the LH box, I couldn’t tell you. Nobody has given me clear directions on testing for those signals, and it’s hard to crank the car over and hold meter probes on things without a helper. I’ve been doing 95% of this alone. And I do not have an oscilloscope.
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Old 05-24-2018, 12:20 PM   #71
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Notice how I skipped the explanation of looking at the signal from the EZK to the LH box. I honestly don't know what kind of signal it is. The greenbooks were written before scopes were cheap and available, so they likely tell you to look at an AC voltage reading, I guess. It may be an AC voltage signal with varying frequency. Ipdown in Estonia did well at reverse engineering all the signals and code on the 2.4 system. His website is still up.

Regardless, that's why I said skip that part of the circuit and focus downstream. You gotta figure out where the signal goes missing, or if it's a dead box or a wiring issue.
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Old 05-24-2018, 01:08 PM   #72
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I would think there's probably a way to test with ACV. I tested for DC voltage at pin 1 (signal from EZK) and it was fluctuating between around 4-8 volts. I assume that's a good sign?
Also tested for ground at pin 13 while cranking. With the key off or in position 1, my meter shows 453 ohms. When I turn to position 2 it goes open circuit, and stays that way while cranking.
I take it the ECU isn't grounding the injectors.
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Old 05-24-2018, 01:16 PM   #73
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Idk man I'm busy at the shop. Interpreting others' reading without a diagram right in front of me means almost nothing. Sorry.

I use software flow charts that would point me towards which circuits to check and what the reading should be.

Find the greenbooks is my suggestion at this point. Or buy a scope, or just keep firing away.
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Old 05-24-2018, 01:48 PM   #74
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Don't worry about it, I'm barely able to put this all together and it's pretty much all I've been doing recently.
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Old 05-24-2018, 08:48 PM   #75
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The ECU not being fastened to its bracket wouldn't cause any problems, right? The body of the unit isn't used as a ground?
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