How you going to fail a PCM by running _LESS_ power through the injector
circuits?
General consensus out there is:
Higher impedance injectors on lower impedance circuit is -OK-(assuming range
of 12-16 ohms)
Lower impedance injectors on higher impedance circuit is -NOT OK-(ie. low
impedance GM injectors on Mopar app)
You are the first I've heard to label it as a problem. FWIW, I was concerned
myself, but when I passed the question to the Powertrain guys they didn't
think it was an issue.
Bob
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net]On Behalf Of Bernd D.
> Ratsch
> Sent: Wednesday, August 20, 2003 6:19 PM
> To: dakota-truck@dakota-truck.net
> Subject: RE: DML: RE: RE: injectors
>
>
>
>
> "The ECM has power transistors (also called injector drivers) in it to
> control the switching of the injectors ON and OFF. These injector
> drivers can only handle a certain amount of power or they will fail.
> This power is related to the injector impedance. A high impedance
> injector will result in lower power passing through the injector
> drivers. As injectors get larger, their impedance drops and the power
> increases. Make sure the ECM can handle the impedance of the
> injectors
> you install or you could fail the ECM. "
>
> The injectors on our trucks are "High Impedance" - range = 12-16ohm.
> ("Low Impedance" are from .9ohm-4ohm).
>
> When you change the resistance, you're also changing voltage. (Ohm's
> law)
>
> - Bernd
>
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