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Date:         Fri, 15 Mar 2002 21:08:43 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Electrical Saga Continues
Comments: To: Dagbear@AOL.COM
In-Reply-To:  <bc.23300be9.29c3ecd1@aol.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 07:33 PM 3/15/2002, Rico Dagastino wrote: >ignition module, which is connected to the ECU by a white wire, trigger the >injectors by sending an electrical charge from the Ignition Module to the >ECU, or is the firing of the injectors triggered by the ignition module >grounding the triggering circuit in the ECU? Knowing the answer to this >question would allow me to more easily find the faulty component.

See if you have constant +12v to the injectors. The ECU fires them by grounding them. It uses the wire from the ignition module for tacho and timing information -- among other things the fuel pump won't run if ignition pulses aren't detected.

I don't know the exact nature of the signal from ign module to ECU, but it's a timing, not a power signal. I wouldn't be surprised if it was either 5v or 12v pulsed, very likely with a nice clean pulse derived from the Hall sensor -- might even be a straight pass-through.

david

-- David Beierl - Providence, RI http://pws.prserv.net/synergy/Vanagon/ '84 Westy "Dutiful Passage" '85 GL "Poor Relation"


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