Go back to previous topic
Forum nameEngine Management Systems & Controllers
Topic subjectDash Tach Erratic Behavior MS2 V3 Standalone
Topic URLhttp://forums.2gnt.com/dcboard.php?az=show_topic&forum=54&topic_id=5432
5432, Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by teklein, Dec-31-69 06:00 PM
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
5433, RE: Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by VelocitaPaola, Dec-31-69 06:00 PM
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...?
5434, RE: Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by teklein, Dec-31-69 06:00 PM
Let me check with the builder.

Its also full sequential injection if that matters.
5435, RE: Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by CODE4, Dec-31-69 06:00 PM
As described in the MS2/Extra manual, the circuit is built with a 1K pull-up resistor, and receiving its signal from JS5 (AD6).



5436, RE: Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by teklein, Dec-31-69 06:00 PM
Anymore ideas on this? Triple checked everything I have already triple checked - cannot find anything wrong.
5437, RE: Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by VelocitaPaola, Dec-31-69 06:00 PM
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.
5438, RE: Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by teklein, Dec-31-69 06:00 PM
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.
5439, RE: Dash Tach Erratic Behavior MS2 V3 Standalone
Posted by teklein, Dec-31-69 06:00 PM
This is fixed.

Turned out to be a circuit issue.
I generated this page in 0.0076320171356201 seconds, executing 7 queries.