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Constant MS resets under cranking and load

Alex Buchka

Alex Buchka

8 cylinders
Joined
Apr 8, 2004
Location
Los Angeles
Before I explain the issue I'm having, let me give a list of my current setup:

MS1-E on a V3 PCB, 029y4 firmware, fuel and spark on a Volvo inline 5, sequential COP, wheel decoder mode with 2nd trigger (VR on crank, hall on cam), coil packs with built in ignitors, batch fire, one squirt per cycle. Softcut redline is currently set at 3800rpm. .msq is attached to the post.

The engine will crank and run perfectly when cold, and will idle up to running temp (80c) without issue. When I take it out and drive it it will run fine under low load and partial throttle. If I begin to drive more aggressively the MS will begin to reset under increased throttle position/duty cycle/RPM. The resetting will occur in lower and lower RPM until the car stalls out and is impossible to re-start (due to excess resets during cranking). If the car is left for a few hours the process will essentially repeat, where the resetting will initially not occur at all, gradually becoming worse and worse.

Here's a log screenshot:

attachment.php


I have re-flowed every solder joint in the whole MS, as well as re-wired all the spark outputs and sensor inputs. Right now there is nothing inside the MS except for the bare essentials in order for it to run (5 ignition output wires and one wire for the second trigger input). Today I tried completely isolating the MS from the chassis harness with no effect.

Before I had this resetting problem I had a problem where it would lose sync but not reset. The sync problem went away after I cut the break-out wires inside the MS for fan and launch control. I had connected them to a couple of the un-used IAC pins. I guess it was causing some kind of feedback into the MS. The resets began almost immediately after I cut the fan and launch wires and eliminated the sync problem.

Right now I'm lead to believe it's a problem with the MS itself. The fact that the problem starts in high rpms and progressively gets worse with time suggests it's not a wiring problem.

.msq is attached, just rename to .msq instead of .zip
 

Attachments

  • resets-log.png
    resets-log.png
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  • 04-11-08-242T5-Resets.msq.zip
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A couple things...

1. how "often" are the resets? Do they occur on 5-10-15 second intervals?

2. Is your case touching anything? I've read before that v3 boxes need to be isolated from ground.

And this may not be related to anything, but looking at the injector PW's and the throttle position... each jump in PW corresponds with a change in throttle position... I think your accel trigger is too low... or whatever it's called. What does your afr look like each time the PW spikes? Is the behavior still there when you disable accel enrichment?

Mike
 
1. The resets occur randomly while cranking. I.E. it will crank and sometimes it will reset once or twice during cranking, then it will catch and start running. This is random and seems to be independent of starting hot or cold. Once it's idling it will randomly reset if i stab the throttle quickly but this only seems to happen when the engine is warm. If I'm driving around it will reset during higher throttle opening, higher rev acceleration.

As I mentioned in the OP, the resets will become progressively worse and worse, occuring at lower and lower rpm's until it will constantly reset even at idle (every 2-5 secs). Eventually it gets so bad it won't even idle. At that point it resets so much during cranking it's impossible to start. If I let it sit for 15-20 minutes it's like the reset problem has begun progressively "curing itself" and it will only reset during mild acceleration but continues to get worse and worse.

2. The MS case is screwed to a plastic cutting board that is completely isolated from ground.

I was goofing with the accel enrichment. I tried both MAPdot and TPSdot. Both made the car reset equally bad. Those spikes are definitely from accel enrichment. They go away if i turn it off.

The resets seem to be closely related to throttle position, more specifically, deltaTPS. If I roll into it slowly there is no reset but if i press the throttle quickly it does. I tried disconnecting the TPS but the MS would still reset under quick changes i throttle position. It's a very perplexing problem...
 
Hey man,

another Q for ya... by resets, you mean actual processor resets that show up in the bottom right corner of the screen AND in MLV as red lines?

If so.... I'm looking at your msq... why is your hard cut rev limit set to 3800rpm?

If you look at the log you posted, both of the resets shown are at least at 3800rpm...

I dunno... maybe I'm not looking at it correctly. Can you bump up your rev limit to something like 5000rpm and repeat the test? It would eliminate the rev limiter as part of the problem.

Mike
 
740ATL said:
Hey man,

another Q for ya... by resets, you mean actual processor resets that show up in the bottom right corner of the screen AND in MLV as red lines?

If so.... I'm looking at your msq... why is your hard cut rev limit set to 3800rpm?

If you look at the log you posted, both of the resets shown are at least at 3800rpm...

I dunno... maybe I'm not looking at it correctly. Can you bump up your rev limit to something like 5000rpm and repeat the test? It would eliminate the rev limiter as part of the problem.

Mike
Click to expand...

Yep, it hard resets, the counter in MT counts up and MLVW shows a red line. The log file I posted above actually shows three resets. The middle one is covered by the cursor. The first reset is the only one that happened at the revlimit, the next two are around 3000 and ~2800rpm respectively.

I set the hard cut at 3800 so I wouldn't have any accidents during tuning. The car has no tachometer so I'm scared to rev it too high under load and break something.
 
The chassis harness was really stodgy, and I suspected that may be a part of the problem, so Karl and I replaced it with a universal 21 circuit. The upside is all the lights are much brighter and much more reliable, downside is it still resets. I've narrowed down the problem to three things; the MS itself, the ignition coils, or the crank sensor. My buddy justin (kildea) is letting me borrow his MS and a set of 960 ignition coils I'm going to try tomorrow.
 
I suspect ignition coil! When I had COPs on my 1jz, it resets like crazy, can't solve it. So I put in seperate coils with wires. That cured the problem. strange.
 
Hooked up the 960 coils last night with some super hack-job wiring. Tentatively I want to say the problem is fixed but I need to do some more testing later today. Two of the six coils were toast due to Justin frying his powerstages with some errors in settings so the engine in Karl's car only ran on four cylinders last night. I'll see about getting some other coils today/tomorrow and doing some more comprehensive testing.
 
OMG OMG!!! I just drove it with the 960 stuff all hooked up. No resets at all, what so ever. That car is criminally fun to drive, and it sounds so bad ass.
 
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