Spark C Stopped working

[JakeusSnakeus]

I have an MS2 running 6cyl wasted spark that was fully working but recently my spark output C has stopped firing so I've lost two cylinders.

In test mode Spark A & B fire, D14 and D16 flash as expected but spark C does nothing and D15 does not flash.

I have checked the BIP to make sure its not grounded out on the heatsink and i've also made sure the wiring to the coil driver is ok and even tried a new coil driver. Just to clarify for spark C im connected to the top of r27 with a 330ohm resistor anda wire to leg 1 of the driver. leg 2 to the coil and leg 3 to ground.

Can anyone advise further?

[JakeusSnakeus]

Just read: http://www.msextra.com/forums/viewtopic ... 32&t=59923

So i could remove the CPU and apply 5v to pin 7 to see if it lights up?

[Matt Cramer]

Pin 7 is spark A - spark C is going to be pin 9. The 5V test is a good one if you're using the LED / resistor spark mods.

[JakeusSnakeus]

Nothing from pin 9...

Pin 7 & 8 make A & B light up so i guess i need to replace Q7

[JakeusSnakeus]

Replaced Q7 and C is lighting up now but its very dim:

A



B



C



Any Ideas?

[JakeusSnakeus]

Bump,

Please help! What other components could be to blame? The output still isn't working...

[dontz125]

Check the two resistors attached to that transistor for rating, security and condition. Check the resistance from the daughter card pin to the base resistor.

If that doesn't solve anything, reflash the firmware.

[JakeusSnakeus]

Thanks dontz, I'll check resistances in the morning.

Although I didn't mention in my last post that when in test mode with the daughter card connected the output light will flash but the output wasn't able to make a known working coil spark