hey all, been wrecking my brains here..
setup as following, MS2 on a v3.0 board
now.. everyting works fine on the stim for starters (yay)
as soon as i plug it into the vehicle, no go... cant even connect with Tuner studio,
i have 12v feed, clean grounds (that i've double checked), and 5v coming from the 5v line
the fuel pump turns on, iac opens up...
what on earth is goin on??
MS2 wont fire up
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If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: MS2 wont fire up
Test MegaSquirt on car for short circuit, you must. To check for a short in the Megasquirt PCB, power up the Megasquirt on the car and check the following points for voltage with a multimeter.
You should find the same voltage as the battery voltage on the following points: S12, S12C, the center legs of Q9 and Q12, the left (non-banded) end of D3, the left leg of U5, and the left (banded) end of D9.
You should have 5 volts at the following points: S5, the two +5V holes in the proto area, the right (non-banded) end of D9, the right leg of U5, the left (banded) end of D19, and pins 1, 20, and 31 of the CPU.
Let me know where correct voltages you find, and where voltage not right is.
You should find the same voltage as the battery voltage on the following points: S12, S12C, the center legs of Q9 and Q12, the left (non-banded) end of D3, the left leg of U5, and the left (banded) end of D9.
You should have 5 volts at the following points: S5, the two +5V holes in the proto area, the right (non-banded) end of D9, the right leg of U5, the left (banded) end of D19, and pins 1, 20, and 31 of the CPU.
Let me know where correct voltages you find, and where voltage not right is.
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drunken_yoda
- MegaSquirt Newbie
- Posts: 14
- Joined: Mon Sep 05, 2011 3:44 pm
Re: MS2 wont fire up
hey, have done the tests as described... all checks out ok...
i have noticed that the fuel pump will cycle on, stay on for 5 seconds then turn off...
ALSO... with the crank angle sensor wiring, i have the diy autotune loom which supplies the 5v refence, according to the manual for the motor, originally the CAS has a 12v feed, would this cause any issues? ( currently i am using the 5v reference)
i have noticed that the fuel pump will cycle on, stay on for 5 seconds then turn off...
ALSO... with the crank angle sensor wiring, i have the diy autotune loom which supplies the 5v refence, according to the manual for the motor, originally the CAS has a 12v feed, would this cause any issues? ( currently i am using the 5v reference)
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drunken_yoda
- MegaSquirt Newbie
- Posts: 14
- Joined: Mon Sep 05, 2011 3:44 pm
Re: MS2 wont fire up
is there any way to test the MS2 on the bench without the stim, ie just a 12v feed, or does it need the sensor inputs for start up?
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: MS2 wont fire up
Stop trying Yoda grammar in my posts, I will.
Yes, you can run it on a bench with just a 12 volt power supply. Naturally, this won't let you check the sensor inputs.
Whether using VREF to power your sensor is OK depends on (1) whether your sensor works on 5 volts (some do, some don't), and (2) how much current it draws.
Yes, you can run it on a bench with just a 12 volt power supply. Naturally, this won't let you check the sensor inputs.
Whether using VREF to power your sensor is OK depends on (1) whether your sensor works on 5 volts (some do, some don't), and (2) how much current it draws.
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drunken_yoda
- MegaSquirt Newbie
- Posts: 14
- Joined: Mon Sep 05, 2011 3:44 pm
Re: MS2 wont fire up
ok, have tried powering with just 12v on bench.. cannot connect with Tunerstudio, when i apply power (12v dc nom.) all three leds flash and that is all... ARGH 
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drunken_yoda
- MegaSquirt Newbie
- Posts: 14
- Joined: Mon Sep 05, 2011 3:44 pm
Re: MS2 wont fire up
well.... damn.. own mistake... i kept changing the usb port depending upon being out in the shed, or on the bench with the stim...
and ofcourse the adapter/laptop didnt recognise the port. now all is ok
and for the CAS i ended up having to use a pullup resistor from the 5v refence to the signal wire now all is ok
cheers for the help master jedi Cramer
appreciated much is was