Author Topic: Trigger errors  (Read 7222 times)

Offline SierraCos2wd

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Trigger errors
« on: May 20, 2009, 05:10:08 am »
i have some trouble with my trigger signal.
When i drive below 3000rpm on no boost, i see in megatune that i lost my rpm signal. Starts jumping from etc 2-3000rpm to 0rpm an the car starts to jump forward etc.. But when i push the throttle an the car starts to boost then the rpm signal its ok. Its only happend when i drive easily around 3000rpm an below.

I have 18-1 missing tooth wheel with hall sensor 1GT101 an no cam sync. Use distrubtor an msd6AL ignition box with msd blaster 2 coil. Could this cause the problem?

I use firmware 1.0.73final Vems V3.3 Engine is a 2.0l Cosworth
1 x Assembled v3.3 controller
  - secondary_trigger: HALL
  - primary_trigger: HALL
  - mounting-style: screws
  - LCD connection: yes
  - ignition driver: 8
  - MAP connection: 400kPa (6/4mm pneumatic)
  - PS2 connection: no
  - Knock and EGT: yes
  - Flyback: 30V flyback
  - 1-wire interface: no

Here are my msq file:
http://www.vems.hu/files/TomAndreSetnan/gevingaasenmap.msq

Hope someone could help.  :)
Maybe this should be in another thread ???

Regards
tom andre
norway
Ford Sierra Cosworth<br />Powered by VEMS

Offline rob@vems.co.uk

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Re: Trigger errors
« Reply #1 on: May 20, 2009, 03:53:23 pm »
Can you scope the signal coming from your 18-1 trigger?

Hall is pretty good when it comes to handling noise, so I have to wonder if there's a problem with the ECU loosing sync with the trigger - at low speed it may be seeing a missing tooth where there is none.

Offline SierraCos2wd

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Re: Trigger errors
« Reply #2 on: May 20, 2009, 06:42:57 pm »
yes i can try to do that today. Can it be something else?
Ford Sierra Cosworth<br />Powered by VEMS

Offline jadzwin

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Re: Trigger errors
« Reply #3 on: July 31, 2009, 02:59:53 am »
I have noticed that the pullup voltage measured at EC36 pin 27 for primary hall sensor is 2.8V (I've measured this voltage in 3 vems, 2 genboards ver3.5 and 1 genboard ver 3.6)
For ATMega128 input high voltage is 0.6*Vcc so the minimum voltage should be 3V. We had very similar behaviour in one of the car (VW Golf 60-2 Hall), and additional 10K pullup resistor helps. For secondary input (hall sensor) there is regular 5V and everything works very well.

Kuba
« Last Edit: July 31, 2009, 03:42:33 pm by jadzwin »

Offline z0tya

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Re: Trigger errors
« Reply #4 on: July 31, 2009, 01:42:28 pm »
Special n-1 in primary trigger should be enabled?

Offline d00ze

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Re: Trigger errors
« Reply #5 on: August 11, 2009, 06:59:47 am »
Check your grounding to the coils. I hade the same problem with trigger errors on my ca18det. My problem was bad grounding to the coil bridge.
Installed a new ground wire to the chasie and the problem got soloved.
Max Larsson
Nissan 200sx s13 ca18det
wiki page: http://www.vems.hu/wiki/index.php?page=MembersPage%2FMaxLarsson