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Subaru Legacey 2.0 2003 non turbo - Hego function - Fixed #

Posted by Nigel Bennett on November 10, 2010, 11:28 pm

Year of Manufacture *: 2003
Engine Size and Code *: 2.l0

Hi everyone. What sort of values should we see from
the Hego sensor? we have 2.18 volts in and 1.8 volts
out the other side? these figures do fluctuate slightly but really flat line.
The original sensor had a shorted heater circuit and the ecu was shutting down the heater control
this raised the fault code,non cleared.
Also a wiring diagram for above would be helpful.
Thanks Nigel..

Re: Subaru / legacey non turbo hego function.

Posted by Pete mutlow User icon on November 11, 2010, 12:10 am, in reply to "Subaru / legacey non turbo hego function."
Peter Mutlow

Morning Nigel,

How many wires has this thing got and their values?

Regards

Pete M

Re: Subaru / legacey non turbo hego function.

Posted by Mark Carter User icon on November 11, 2010, 9:45 am, in reply to "Re: Subaru / legacey non turbo hego function."

Hi Nigel,
I am getting confused with regard to your comment "in and out" can you explain how you are testing/seeing the voltages that you mention.

Regards Mark

Modern cars, Its all wizardry and witchcraft

Re: Subaru / legacey non turbo hego function.

Posted by Kevin Apps User icon on November 11, 2010, 10:06 am, in reply to "Subaru / legacey non turbo hego function."
Kevin Apps

Nigel.
Wide-band sensor ? I would think so.
Kev.

Re: Subaru / legacey non turbo hego function.

Posted by Nigel Bennett User icon on November 12, 2010, 7:06 am, in reply to "Re: Subaru / legacey non turbo hego function."
Nigel Bennett

Hi all.Four wire heater circuit,work fine,other two wires back probed.

Re: Subaru / legacey non turbo hego function.

Posted by Mark Carter User icon on November 12, 2010, 9:13 am, in reply to "Re: Subaru / legacey non turbo hego function."
Mark Carter

Hi Nigel, if it is a four wire sensor then two of the wires are probably white in colour, with the third being black and the last being gray.

If this is the case then the two white wires are your heater and the other two the sensor.

You need to connect your scope across the two sensor wires with the positive lead going to the black wire and the negative lead from the scope on the gray wire. Connecting the scope this way takes into account the "Floating" earth of the sensor.

Regards Mark

Modern cars, Its all wizardry and witchcraft

Re: Subaru / legacey non turbo hego function.

Posted by lee woods User icon on November 12, 2010, 8:42 pm, in reply to "Re: Subaru / legacey non turbo hego function."
Lee Woods

I have seen imprezas that loose the earth path on they grey wire maybe legacy has the same fault , try putting your own earth to the grey it should bring the switching voltage into range.

Re: Subaru / legacey non turbo hego function.

Posted by Mark Carter User icon on November 12, 2010, 10:14 pm, in reply to "Re: Subaru / legacey non turbo hego function."
Mark Carter

Hi Nigel,
Try not to do what Lee has just said, as this will counter the effect the "floating" earth of the sensor and may cause more fault codes than it fixes.

Regards Mark

Modern cars, Its all wizardry and witchcraft

Re: Subaru / legacey non turbo hego function.

Posted by Nigel Bennett User icon on November 17, 2010, 5:20 pm, in reply to "Re: Subaru / legacey non turbo hego function."
Nigel Bennett

Hi. ECU pin diagram would be really helpful, anyone?
Cheers
Nigel.

Re: Subaru / legacey non turbo hego function.

Posted by Nigel Bennett User icon on November 18, 2010, 8:24 am, in reply to "Re: Subaru / legacey non turbo hego function."
Nigel Bennett

Bump

Re: Subaru / legacey non turbo hego function.

Posted by Kevin Apps User icon on November 18, 2010, 4:01 pm, in reply to "Re: Subaru / legacey non turbo hego function."
Kevin Apps

Nigel.
Results of scoping the sensor BUMP.
Kev

Re: Subaru / legacey non turbo hego function.

Posted by Nigel Bennett User icon on November 18, 2010, 9:56 pm, in reply to "Re: Subaru / legacey non turbo hego function."

Hi Kevin. Scoped hego as follows.If this a wide band
sensor it has only four wires,and the values appear to be out of thr range i have seen before ?
Regards Nigel.

Fixed #

Posted by Nigel Bennett on November 19, 2010, 11:15 pm, in reply to "Re: Subaru / legacey non turbo hego function."
Message modified by board administrator November 20, 2010, 4:45 pm

Fix. The sensor appears to be working correctly
From the data and information I've collected.
The stalling was just the throttle body needed cleaning.
Thanks for replies.Cheers Nigel.

FIX Re: Subaru / legacey non turbo hego function.

Posted by Nigel Bennett User icon on November 21, 2010, 8:47 am, in reply to "Re: Subaru / legacey non turbo hego function."
Nigel Bennett

Fix. The sensor appears to be working correctly
From the data and information I've collected.
The stalling was just the throttle body needed cleaning.
Thanks for replies.Cheers Nigel.

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