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Old Mon, Aug-27-2018, 04:54:52 PM   #21
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Default Re: no power at pin 23, crank no start, no power to DME

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Originally Posted by geargrndr View Post
I missed (or forgot..?) that you already sent this DME out and it can be bench-read fine.

Before I get into it, I suspect you have a wiring harness problem. I'm gonna guess something is shorted or melted or has come loose somehow. The fact that you neither get a start, nor does the main ECU relay get triggered, nor can you connect to the DME suggests something significant is wrong.

1. Have you pulled and inspected and reconnected all the connectors in the adapter harness?

2. Did you bother to check the ACTUAL power at the relay output pins and fuse block with the jumper in place, or did you just try and start the car and walk away when it didn't magically work?
Critical to know if you getting good solid voltage at those fuses after you hear the relay click. That's fundamental. Please try to follow through on the diag steps, you're just wasting trips out to the car by not checking this stuff in detail each time. To make it painfully clear...

With the relay 'hot wired', first, do you indeed get power at the relay output pins (2 & 5)?
Then, if so, do you have power then at the fuse block which connects to those output pins?
3. The other external relay that the DME activates is the fuel injector relay. That is via X60001 (9-pin black) pin 1.
That one is not ground-switched so to hot-wire test it is a bit more tricky, you'd need to supply it with power. Or at least as step one you can see if its currently supplied with power when the ignition is turned on.
4. The fact that the starter turns should mean that the DME is booting up - assuming you haven't done some kind of DME-starter-relay-bypass as part of the conversion? What's the convention for E36 swap starter activation? If the starter relay is powered directly from the ignition key, then that tells us nothing...
On your DME connectors, ignition on, and with your relay-hot-wire jumper in place, the power supply should be:

X60001 9-pin black - power at pins 7 & 8, ground at pins 4, 5, 6

X60004 40-pin black - power at pin 26

X60005 9-pin black - ground at pin 5
Like I say, given that you can't comm w/ the DME but it tests Ok on the bench, and its not turning on relays... that seems to imply multiple connections are not being made (or the DME is really fried and the bench test was flawed...)
#1 there are only a handful of connections on from the addaptor harness, #1 being the x60004 to the DME, the x20 on the E36 harness, a power wire from the starter 30h terminal to the pin 15 on the x20, and a few variable wires like the throttle pedal wire, the coolant sensor wire.
ive checked them and i do not see anything melted or loose. car was running flawlessly until that battery cable came loose. as far as i know, the car doesnt use a starter bypass or anything like that.

Regarding #2,
with DME jumper wire grounded from #4, checking volts on the 5 fuse pack, ignition off;
I have 12volts 1-10 so the whole thing is getting correct voltage with the DME #4 jumpered in-line to ground

edit; regarding the bench read that was done, i do not know what method was used to read it or how it was hooked up, maybe i can get him to chime in here regarding how it was done.

Im working on the other things you asked me to check in #3,4

Last edited by T3AMFiSh; Mon, Aug-27-2018 at 05:12:32 PM.
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Old Mon, Aug-27-2018, 05:27:54 PM   #22
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Default Re: no power at pin 23, crank no start, no power to DME

What color wire is pin 23? Might be able to help...


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Old Mon, Aug-27-2018, 05:31:25 PM   #23
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Default Re: no power at pin 23, crank no start, no power to DME

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What color wire is pin 23? Might be able to help...


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brown with white stripe, it goes from the x60002 to terminal #4 on the blue DME relay
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Old Mon, Aug-27-2018, 05:33:28 PM   #24
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Default Re: no power at pin 23, crank no start, no power to DME

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brown with white stripe, it goes from the x60002 to terminal #4 on the blue DME relay


Unplug the connector and relay then check resistance between the 2 ends of the wire. Should be a low value like .01 ohms.


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Old Mon, Aug-27-2018, 05:35:12 PM   #25
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Default Re: no power at pin 23, crank no start, no power to DME

Cool.

From the further #23 test that Terra had you do, clearly your DME isn't able to turn the main relay on. So at least that specific transistor doesn't work... or... maybe the DME is even more faulty than that.

Like is the DME booting up in the car at all right now. That's why I was asking you about the power connections, and, the starter connection.

From what you say, sounds like the starter runs directly off the E36 ignition switch (i.e. starter turns even if the DME is in a cardboard box on the kitchen table, yes?) That wouldn't be a bypass necessarily, it'd just be a simplification of the E46M3 starter wiring which IIRC has a 'dual' activation where both the DME and EWS have to turn the starter relay on...

If indeed it will crank regardless of the DME, then the fact it cranks does not tell us the DME is actually booting up at all, which - if DME is NOT getting power - would obv also explain why you can't speak to it w/ diagnosis software.
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Old Mon, Aug-27-2018, 05:38:21 PM   #26
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Default Re: no power at pin 23, crank no start, no power to DME

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Originally Posted by bigjae1976 View Post
Unplug the connector and relay then check resistance between the 2 ends of the wire. Should be a low value like .01 ohms.
Highly unlikely its the wire. He's just proven that the DME is not switching the wire in the first place, so the wire continuity would be entirely secondary to that.
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Old Mon, Aug-27-2018, 05:45:56 PM   #27
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Default Re: no power at pin 23, crank no start, no power to DME

well is the thought the problem lies in the DME? i shot a message to PITT M3 about how he was able to bench test it, he thought he might have powered the pin 23 to make it work, i asked him what methods he used to attach it to bench test it.. waiting on a response..
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Old Mon, Aug-27-2018, 05:46:08 PM   #28
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Default no power at pin 23, crank no start, no power to DME

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Originally Posted by geargrndr View Post
Highly unlikely its the wire. He's just proven that the DME is not switching the wire in the first place, so the wire continuity would be entirely secondary to that.

Misunderstood the issue...

Cranks but wonít start, Iím assuming you donít have the EWS immobilizer wired in?

If you donít, thereís a wire that comes from Pin 3 on the EWS, goes to fuse #14 and then to the DME. Once you code the ECU, you need to connect the wire coming from the DME to power. Itís basically a fused loop from the EWS to the ECU.

I think itís black, look on the WDS diagram for fuse 14. Iíd do it but Iím out of town.

Otherwise the ignition coils will not fire.

I dicked with this for a day when I was deleting my EWS. Everyone said to just connect pins 1 and 2 on the EWS...


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Old Mon, Aug-27-2018, 05:51:09 PM   #29
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Default Re: no power at pin 23, crank no start, no power to DME

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Originally Posted by T3AMFiSh View Post
well is the thought the problem lies in the DME? i shot a message to PITT M3 about how he was able to bench test it, he thought he might have powered the pin 23 to make it work, i asked him what methods he used to attach it to bench test it.. waiting on a response..
Dude the thought is the thoughts I typed very forkin detailed details about the logic of. Are you a millenial by chance?
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Old Mon, Aug-27-2018, 05:52:29 PM   #30
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Default Re: no power at pin 23, crank no start, no power to DME

Here - Here is what "the thought is"

Quote:
Originally Posted by geargrndr View Post
From the further #23 test that Terra had you do, clearly your DME isn't able to turn the main relay on. So at least that specific transistor doesn't work... or... maybe (not for sure but >>maybe<<) the DME is even more faulty than that.

Like is the DME booting up in the car at all right now. That's why I was asking you about the power connections, and, the starter connection.

From what you say, sounds like the starter runs directly off the E36 ignition switch (i.e. starter turns even if the DME is in a cardboard box on the kitchen table, yes?) That wouldn't be a bypass necessarily, it'd just be a simplification of the E46M3 starter wiring which IIRC has a 'dual' activation where both the DME and EWS have to turn the starter relay on...

If indeed it will crank regardless of the DME, then the fact it cranks does not tell us the DME is actually booting up at all, which - if DME is NOT getting power - would obv also explain why you can't speak to it w/ diagnosis software.
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Discussing no power at pin 23, crank no start, no power to DME in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)