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Top 2GNT Technical Performance/Engine Engine Management Systems & Controllers topic #5432
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Subject: "Dash Tach Erratic Behavior MS2 V3 Standalone" Previous topic | Next topic
ModeratortekleinNov-23-11 09:57 PM
Member since Nov 04th 2007
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#5432, "Dash Tach Erratic Behavior MS2 V3 Standalone"


          

Hey,

So have the car without the stock ECU and harness!

One issue - the dash tach is ridiculously erratic.

Sometimes works, sometimes doesnt, sometimes acts ridiculous and jumps around for no reason.

MS rpm reads fine.

Ive verified settings in TS, checked continuity several times.

Tach worked fine with MS1 piggy backed on stock ECU.

Any ideas?

Thanks!

Tim Klein

  
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Replies to this topic
RE: Dash Tach Erratic Behavior MS2 V3 Standalone, VelocitaPaola, Nov-23-11 11:40 PM, #1
RE: Dash Tach Erratic Behavior MS2 V3 Standalone, Moderatorteklein, Nov-24-11 05:47 AM, #2
      RE: Dash Tach Erratic Behavior MS2 V3 Standalone, AdministratorCODE4, Nov-24-11 07:09 AM, #3
           RE: Dash Tach Erratic Behavior MS2 V3 Standalone, Moderatorteklein, Nov-25-11 09:23 PM, #4
                RE: Dash Tach Erratic Behavior MS2 V3 Standalone, VelocitaPaola, Nov-25-11 09:25 PM, #5
                     RE: Dash Tach Erratic Behavior MS2 V3 Standalone, Moderatorteklein, Nov-26-11 07:54 AM, #6
                          RE: Dash Tach Erratic Behavior MS2 V3 Standalone, Moderatorteklein, Nov-26-11 10:56 AM, #7

VelocitaPaolaNov-23-11 11:40 PM
Member since Jun 13th 2005
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#5433, "RE: Dash Tach Erratic Behavior MS2 V3 Standalone"
In response to Reply # 0

          

What sort of tach out circuit are you using? The one in the MS2/Extra manual, one of the stepper motor driver's pins, or...?

-----------------------------------------

-Paul

Service Manuals and Guides

  
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ModeratortekleinNov-24-11 05:47 AM
Member since Nov 04th 2007
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#5434, "RE: Dash Tach Erratic Behavior MS2 V3 Standalone"
In response to Reply # 1

          

Let me check with the builder.

Its also full sequential injection if that matters.

  
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AdministratorCODE4Nov-24-11 07:09 AM
Member since Nov 23rd 2003
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#5435, "RE: Dash Tach Erratic Behavior MS2 V3 Standalone"
In response to Reply # 2



          

As described in the MS2/Extra manual, the circuit is built with a 1K pull-up resistor, and receiving its signal from JS5 (AD6).



---

2012 2500HD LML

  
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ModeratortekleinNov-25-11 09:23 PM
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#5436, "RE: Dash Tach Erratic Behavior MS2 V3 Standalone"
In response to Reply # 3

          

Anymore ideas on this? Triple checked everything I have already triple checked - cannot find anything wrong.

  
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VelocitaPaolaNov-25-11 09:25 PM
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#5437, "RE: Dash Tach Erratic Behavior MS2 V3 Standalone"
In response to Reply # 4

          

Originally posted by teklein
Anymore ideas on this? Triple checked everything I have already triple checked - cannot find anything wrong.

Did you check with whoever built your ECU? If you're sure the settings are correct, and the wiring is sound, then there must be a hardware problem.

-----------------------------------------

-Paul

Service Manuals and Guides

  
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ModeratortekleinNov-26-11 07:54 AM
Member since Nov 04th 2007
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#5438, "RE: Dash Tach Erratic Behavior MS2 V3 Standalone"
In response to Reply # 5

          

Originally posted by VelocitaPaola
Originally posted by teklein Anymore ideas on this? Triple checked everything I have already triple checked - cannot find anything wrong.
Did you check with whoever built your ECU? If you're sure the settings are correct, and the wiring is sound, then there must be a hardware problem.


Dave built it. Its not the builder, passed on thr JimStim.

I am going to swap a different cluster in. Maybe the tach went bad while the harness was apart. Ive seen weirder things.

  
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ModeratortekleinNov-26-11 10:56 AM
Member since Nov 04th 2007
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#5439, "RE: Dash Tach Erratic Behavior MS2 V3 Standalone"
In response to Reply # 6

          

This is fixed.

Turned out to be a circuit issue.

  
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