Date:         Wed, 11 Mar 2015 20:12:24 -0700
Reply-To:     John Goubeaux <john@UCSB.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Goubeaux <john@UCSB.EDU>
Organization: UCSB
Subject:      Re: No Start Scenario
In-Reply-To:  <fa9e4a9e4366.5500a12a@education.ucsb.edu>
Content-type: text/plain; charset=windows-1252; format=flowed

Thanks Mark,

I will check the  D15 connection back to the coil. I did go ahead  and
replace the ignition switch though, as it was old and worn ( and on my
list of to does ) Still have to finish putting the connectors on to see
If that changes things at all.

-john



On 3/11/2015 8:10 PM, John Goubeaux wrote
>
> ----- Original Message -----
> From: mark drillock <mdrillock@COX.NET>
> Date: Wednesday, March 11, 2015 4:02 pm
> Subject: Re: No Start Scenario
> To: vanagon@GERRY.VANAGON.COM
>
>
>> The fuel pump is at the far end of a chain of several things that all
>> must happen before the fuel pump will run when it is supposed to. In my
>> experience only rarely is the cause the pump itself or the relay for the
>> pump.
>>
>> Both relays have to be installed and working for the fuel pump to run
>> like it is supposed to. The ECU controls the FP relay by switching its
>> ground pin on/off.
>>
>> What you are experiencing is pretty common these days. One cause is a
>> burned out pin D15 of the main panel. This is the pin that the key
>> switch powers on to run the ignition coil and trigger the power relays
>> for the ECU and fuel pump. It is a black wire and you can measure at the
>> ignition coil black wires to see that the key-on power is reaching the
>> coil. From there the smaller of the black wires carries power over to
>> the 2 relay sockets to enable them. That is what you found missing, the
>> enabling voltage at pin 86 of the FP relay socket. Check the black wires
>> for voltage when the key is on.
>>
>> Mark
>>
>>
>> John Goubeaux wrote:
>>> Hi Guys,
>>>
>>> 2WD 90 2.1
>>>
>>> I'm trbl shooting a NO start scenario.
>>>
>>> Starter cranks over the engine just fine. I Do NOT hear the FuelPump
>> pre
>>> cycle  - at all - when ignition goes to the ON stage SO I headed in
>> that
>>> direction and used the  FuelPump Relay diagnose from this page:
>>> http://www.vanagonparts.com/fuel_pump_relay.html - which BTW looks like
>>> it is derived from the "Dijifant Guide"
>>>
>>> So starting with the FP Relay:
>>>
>>> I pulled the Relay
>>> I confirmed that # 30 has battery current BUT  # 86 does NOT
>>> I jumped  #87 with #30 and FP whirls away ( so FP does work )
>>> I checked continuity with #85 to ground with engine cranking and I have
>>> continuity ( So ECU is going to ground )
>>>
>>> So, what does the fact that I do NOT get battery current from # 86 mean
>>> ? And is this from the Ignition switch? (  or should I have left the
>>> relay plugged in while testing ?)  There is No indication in the steps
>>> other than to "diagnose the circuit". I'm unclear IF that circuit is
>>> energized from the FI Relay OR the ignition switch. So this is where
>> I
>>> am stuck.
>>>
>>> I've got a new ignition switch and relays on the way so can do some
>>> swapping out AND intend to replace the ignition switch anyway as it
>> IS old.
>>> Can I assume that at this point the ECU and FP are OK and that it's
>>> likely a relay, ignition switch, and or connections in between ?
>>>
>>> Thanks for any advice
>>>
>>> PS:I know there is a lot of info online already on this topic, BUT I've
>>> yet to find a thorough diagnostic step by step with ALL the needed info.
>>>
>>> -john
>>>
>>>