Thanks for the replies people. Am at work right now, no Bentley.

Looking here:

http://faculty.ccp.edu/faculty/dreed/campingart/vanagon/87vanagonschmatics/simple87engine.gif

I see the negative wire of several items connected to 6 of ECU.

I will double check that there's continuity between each of these wires and
6 of ECU.

I totally get what you're saying Mark; the ECU supplies the negative side
of circuit.

On Sat, Jun 9, 2012 at 3:08 PM, mark drillock <mdrillock@cox.net> wrote:

Don't assume that ECU connector pin 6 is the same as frame ground. It is FI
> sensor common, and may be "ground" when ECU is plugged in(I don't know),
> but without the ECU plugged in pin 6 is certainly not grounded and may not
> be true ground even with the ECU present.
>
> First, with both device unplugged, Bentley says measure from pin 4 of AFM
> connector to pin 6 of ECU connector. What ohms do you get doing that?
>
> Second, Bentley says with AFM connected and ECU removed, measure between
> pin 6 and pin 9, both on the ECU connector. What do you get? This may be
> your running problem if outside of expected range.
>
>
> Mark
>
>
> neil n wrote:
>
>> Hi all.
>>
>> Under these conditions:
>>
>> - grounds between engine and frame cleaned and ok, new braided strap
>> between engine and frame
>> - battery negative clamp dis-connected, ECU dis-connected
>> - VOM probe to new braided engine ground strap or various points on engine
>> metal.
>> - big brown ground wire in ECU harness re-connected to bare frame metal
>> near ECU.   (this made no difference to engine performance)
>>
>> I should see continuity between pin 4 of AFM plug, ground wire of temp II
>> sensor, ground of throttle valve (enrichment) switch, pin 6 of ECU, and
>> engine metal or frame correct?
>>
>> I don't. Measuring between pin 6 of ECU harness and new ground point near
>> ECU, I see a huge resistance or infinite Ohms.
>> ..........................
>>
>>

--
Neil n

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