S6 IGN Outputs are LOW CURRENT!

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pat
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S6 IGN Outputs are LOW CURRENT!

Post by pat »

There have been several instances of people trying to use IGN outputs for functions other than ignition. Whilst they may be assigned to other functions, there is a caveat :

IGN Outputs are LOW CURRENT


Do not connect them directly to anything that is either a) inductive or b) likely to draw more than 40mA. This means no ignition coils [unless they have built in ignitors], no relays, no bulbs etc. They are designed to drive the inputs of ignitors or other buffers. Things like OEM fuel pump controllers, the Syvecs DBW H-Bridge driver, LEDs are all fine. If you must drive a load that is either inductive or requires a lot of current then you need to use a buffer. A single channel ignitor module would work fine. Solid State Relays are probably fine. CDI Amplifiers are probably fine [depending on type, see below].

In addition to this the outputs are Active High Push Pull; that means when on they drive the pin to +5 or +12 (selectable by solder bridge on the board) and when off they drive the pin to 0V. This is different to the INJ and AUX outputs which connect the relevant pin to PWRGND when on and do not drive the pin when off. Any CDI ignition amplifier must be able to fire on the *FALLING* edge; if the amplifier is supposed to connect where the OEM coil would have been then it will expect rising edge and will not work if connected directly [use the car's ignitor between the ECU and CDI to invert the signal]. Some CDI modules allow the edge to be configured, it may be possible to connect them directly to the ECU by setting them to falling edge trigger.

Hopefully this clarifies what the capabilities and interfacing requirements of the IGN outputs are.
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