"Bill P." <Yahoo@[EMAIL PROTECTED]
> wrote in message
news:7asYj.85$XO6.24@[EMAIL PROTECTED]
>
> "pipedown" <pipedown@[EMAIL PROTECTED]
> wrote in message
> news:mumdnaDwSeqvoa_VnZ2dnUVZ_hadnZ2d@[EMAIL PROTECTED]
>>
>>
>>>>>>
>>>>>>
>>>>>
>>>>> I looked this morning. Fuse 10 spot is unoccupied and the sticker
>>>>> next to the fuse panel says #10 is for the rear brake towing option.
>>>>> I suspect that diagram only applies to the 83 model. I have the
EVTM
>>>>> published by ford and nothing like the first diagram is included,
the
>>>>> remaining diagrams match the EVTM very well. With no captions on
the
>>>>> diagrams its partly guesswork. The engine is EFI and the controller
>>>>> is marked ECC IV.
>>>>>
>>>>> Can't hurt to try a fuse in #10 but I have little hope it will lead
to
>>>>> a 1 minute fix.
>>>>>
>>>>
>>>> My mistake, I thought you had an 83 Ranger.
>>>>
>>>>
>>> My mistake again, the diagram covers up to the 1990 Ranger/Bronco II.
>>>
>>>
>>>
>>>
>>>
>>
>> So now I am perplexed. I pulled the dash and checked the bulb, it was
>> good and powered from the high side same as a few other lights that do
>> work like the check oil lamp. Then I identified the wire (pink/lt
green)
>> and traced it back into the engine compartment to the first connector.
I
>> get good continuity to that connector. The wire color and lamp match
the
>> EVTM for the 1993 Explorer up to that point
>>
>> Now the crazy part, the mate to that connector has no wire in that pin
>> location, no pin contact and the outside is plugged up so it was never
>> there, not just broken. Furthermore, there is no PK/LG wire at the ECC
>> or the self test connector as it would be if it continued to agree with
>> the 93 diagram.
>>
>> Pin 17 of the ECC which should have that wire has a tan/red wire that
>> leads to the self test connector same pin but I don't know if simply
>> connecting those nodes will result in the check engine lamp working or
>> just burning out the pin.
>>
>> I'll advise the owner to go back to the smog check place and try to
prove
>> there is no lamp. I bet that flees like a lead balloon. Maybe she can
>> call and verify first. Given that I can't find any verified diagram
>> showing the lamp, it might not actually be implemented. Can anyone
>> conform or deny that? Anyone own a 1988 ford truck?
>>
>
> Why don't you just tie it in to another lamp, say the oil pressure, and
> call it good?
>
>
>
Oil pressure is on only when the key is in the start position. Check
engine
should come on in run, stay on in start for a moment and then turn off.
Its close but a good tech might spot the patch and fail the vehicle.
Right
now there is a free retest for this one thing. It must have passed for
years like this.
Im going to look into just wiring the lamp to where it should have been
all
along and see how that goes. Pin 17 of the ECC
http://www.auto-diagnostics.info/ford_eec_iv
I'll try that tomorrow.
Did I mention this is not the original engine but I wouldn't expect this
kind of difference from an engine swap.
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