Bosch 0 227 100 211[SOLVED]

[hippled]

Hello I am trying to uS a Honda cbr 600 and I am using uS with the Bosch 0 227 100 211 ignition module. I have it wire exactly the same as the uS site tells me, I am using a since crank pickup with a 12 -1 tooth sensor.
Then I have the module UNplugged I get a 0-5 square wave out of the ignition port(internals left in uS with 4.7K ohm pull up resistors). if I plug the module in(connect the ignition outputs from uS to the module) the signals never leave 0 v, I ave the module bolted to a heat sink that is bolted to the chassis(so the head sink is grounded) I do not know what is wrong,

do you think the module is bad?

[SQLGUY]

Did you removed the VB921's and jumper their pads, or are you using the pull up resistors all the time?

The impression I get from reading your post is that you are using the pull ups to test, but are not using them when driving the Bosch module. If you haven't removed and jumpered the VB921's, I believe you will need the pull ups left in place to drive the module.

http://www.microsquirt.info/us_logic_level_spark.htm

[hippled]

No I left the internals if uS alone and I am using the pull up resistors all of the time. the only thing I change is if the module is plugged in or not.

[SQLGUY]

Hmmm... so, as soon as you plug in the module, the outputs get pulled from 5V to 0V. Is that correct?

If that's what you're seeing, with no other input or changes involved, then I'd say that either the module is bad or it's miswired. Have you checked resistance on the module between the trigger inputs and the ground pin?

[hippled]

so, as soon as you plug in the module, the outputs get pulled from 5V to 0V. Is that correct?

Yes that is exactly what happends. I have not check the resistance, what should it be?

[Bruce Bowling]

No I left the internals if uS alone and I am using the pull up resistors all of the time. the only thing I change is if the module is plugged in or not.

Since you are keeping the internal VB921 with a pullup resistor, you need to make sure the output is set to "Going Low (non-inverted). It is non-inverted because the VB921 inverts the signal and the Bosch module also inverts the signal, so it is effectively non-inverting. With this setting, the default "resting"output state (the VB921 with pullup to Vref) is near 0 volts because the VB921 is turned on. When the output is active dwell the output is +5 volts from the Vref pullup resistor (VB921 is turned off).

Had you performed the logic-level drive mod then the VB921 is removed but the external driver inverts so the correct setting for this mode is the default "Going High (Inverted)".

- Bruce

[hippled]

I do have the setting set a going low. I have also hook an oscilloscope up and I do not get any positive pulses, if I simple unplug the inputs to the Bosch module I do get positive pulses.

[hippled]

Bad Module, Just use some HEXFETs instead.