jim beam > wrote in
t:

> wrote:
>> On Mar 20, 8:15 pm, " >
>> wrote:
>>>> Have you considered that the sensor may have the wrong electrical
>>>> characteristics for the ECU it's married to?
>>> Yes. That's what I am trying to figure out to get to the bottom of
>>> this. What in the world is the ECM measuring to determine that it's
>>> time to throw a code 41?
>>
>> OK, so I thought about it a little more, since the heater circuit
>> ground goes through the ECM, then it is probably measuring the
>> current through the heater. So an internal leak to ground inside the
>> sensor, or incorrect impedance in the heater would affect the current
>> that the ECM sees. Can you think of anything else to check?
>>
> three things:
>
> 1. if this vehicle is a 1990, as it says in your heading, then the
> engine computer is expecting to see a single wire sensor. the only
> way a 1990 accord would have 4-wire is if the vehicle has been
> converted for some reason.



I did a better check of my Helm manual for that model. It did indeed come
with a 4-wire sensor. So did the Prelude, for that matter.


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Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/