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Battery Disconnected - First CCM NO Power, Then Rough Idle

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

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Year and Model: 2001 XC70 Turbo
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Battery Disconnected - First CCM NO Power, Then Rough Idle

Post by twiggs462 » Sat Sep 24, 2016 7:10 am

I have been ripping my hair out lately with my wife's 2001 XC70 Turbo. This post is mainly about my recent battery disconnect issue, but want to explain what I have done.

This car has had rough idle issues for some time and dimming dash lights so a couple weeks ago. I had taken out the ETM and cleaned it as well as replacing the PCV system components. I also replaced the alternator. Seemed like all the right things to do while I was in their with the intake manifold out of the way.

During this first repair I didn't have the battery disconnected. Car drove perfect for a few weeks. Then a few days ago my wife calls me on her way to work and the car went into "limp" mode. Not going above a certain speed. Rough idle.

It seemed to only be happening in the hot weather. However, this problem was intermittent. To try and correct this, at least just to see if disconnecting the batter would reset something in the ECU to get things "re-learned" - I disconnected the battery, but when hooking it back up did not follow the procedure to reconnect the battery on these models properly (I didn't realize there was one at this time).

When I powered the car back up everything was fine with the exception of the Climate Control dash area had no power, but the car drove fine.

This morning I researched and found where you have to drain the system of electrical power and reconnect the battery with the ignition in the "II" position. Well this fixed the Climate control power issues. But now the car seems to be in permanent limp mode.

What is going on here??? :twisted:

I have a rebuilt ETM that I am willing to throw in - I had purchased it because of a P0121 code I pulled when the car was initially idling rough (I also got a new MAF sensor I want to throw in as well), but want to understand now why after this batter disconnect it made the throttle act this way and put the car in this mode.

Could the ETM just coincidentally kicked the bucket during this, or is the computer reset causing this. I am so lost here. Can anyone offer some advice about what I might be experiencing. I appreciate any help one can provide - I am mentally preparing I might have to tear into this thing again today.

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