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Code P1028 - related to ETM?

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Brucebo
Posts: 245
Joined: 14 May 2008, 22:06
Year and Model: 850 '96, S70 '99
Location: SF Bay Area
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Post by Brucebo »

Updated my ETM about a year ago this month. Been running like a champ. Still is, 'cept the ETS light started coming on this week. Just the light. I do NOT notice any performance issues to the best of my ability. Even cruise control still works fine. I checked the code and it is P1028. Frame capture data showed rpm at 843. I reset the code and the ETS light went out, but came back on again after 50 miles with the same code. This appears to be a Volvo specific/proprietary code. Does anybody know what it means for a '99 S70?

-Bruce
Last edited by matthew1 on 05 Mar 2010, 00:15, edited 1 time in total.
Reason: Bruce - I split this from the other thread because it should be on its own.
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Brucebo
Posts: 245
Joined: 14 May 2008, 22:06
Year and Model: 850 '96, S70 '99
Location: SF Bay Area
Has thanked: 3 times
Been thanked: 5 times

Post by Brucebo »

In both the cases so far that this code has been set, the engine was at idle, so I have a suspicion this code may have something to do with the IAC valve (i.e. the "mini-throttle"). Need to collect more data and maybe do some experiments.

-Bruce
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