Another can't read cylinder count problem.

RollerSkate · Post by **RollerSkate** » Sat Feb 19, 2011 2:34 pm

Hi,
i've been through the archieves to try & sort this one out but no joy & i'm getting a bit fed up now.

I've tried connecting to the Megajolt with 3 different laptops XP/ Vista & 7 via a Prolific USB adapter & always get the 'cylinder count' time out. So i dug out an old XP PC with a serial port & that doesn't work either, the com port is definetly OK as hyper terminal says so, but when i try the 'C' to the megajolt i get nothing back.
I have checked all the voltages on the board & they are OK, the LED lights up & also checked all the soldered joints which are good.
The com port lead is good & the wires go where they should.
The car fires on the EDIS but the jolt unit is just not playing, what next?

Anyone help?
RS

Post by **brentp** » Sat Feb 19, 2011 7:37 pm

Hello,

Just to be clear- does the Megajolt control ignition advance when the engine is running (verify using a timing light) or does it stay fixed at 10 degrees BTDC?

What version Megajolt do you have? And was it built as a solder-yourself-kit, or pre-assembled/tested?

You can also try re-flashing the firmware of the unit- follow these instructions, making sure you select the firmware for the version of megajolt you have:

http://www.autosportlabs.net/MJLJ_Firmware_update

Please keep us posted-

RollerSkate · Post by **RollerSkate** » Sat Feb 19, 2011 9:30 pm

Hi Brent, glad you turned up,

it does nothing, the kit was made by myself (and i hate to sy it, but i am an elec tech, so the soldering should be ok) & the kit is a V4.
i'll try a reflash tomorrow if i can get the time, as i work most days.

cheers
Brad

NITROPIXIE · Post by **NITROPIXIE** » Sat Feb 19, 2011 9:58 pm

Pm sent

RollerSkate · Post by **RollerSkate** » Sun Feb 27, 2011 8:22 am

Turns out it was a bent pin on the Jolt conns bulkhead so that the TX pin wasn't making contact, i'll get the unit back later this week & hopefully it will take a map & we can get the engine going.
RS

Post by **brentp** » Sun Feb 27, 2011 6:08 pm

Glad you got it working. Not sure which bent pin on what connector you're referring to? is it on the Megajolt board or the serial adapter cable?

RollerSkate · Post by **RollerSkate** » Mon Feb 28, 2011 6:45 am

The connector on the pcb.

Post by **brentp** » Mon Feb 28, 2011 7:07 am

Thanks for clarifying. an unusual problem!