IPD sale XeMODeX - Experts in Volvo Electronics Free shipping all USA - Experts in Brakes
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

04 non-turbo v70 ecm-4201- Am I missing anything?

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

floridavolvo
Posts: 4
Joined: Wed Mar 11, 2020 4:24 pm
Year and Model: 2004 V70 non-turbo
Location: Florida
Has thanked: 0
Been thanked: 0
United States of America
floridavolvo

04 non-turbo v70 ecm-4201- Am I missing anything?

Post by floridavolvo » Wed Mar 11, 2020 6:02 pm

I have a 2004 V70 with 155,000 miles on it. It regularly gets 28-30 mpg, hwy, and has been very reliable. This is the "good one". Our other Volvo is a 1999 V70 XC with all the usual problems, currently not running and will be a restore project later.

Now for the problem,

Approximately 1 month ago, the car was in a parking lot with a cascade of codes, stalling and such. The first code thrown was the ECM-4201 and all through this it has been the only consistent code. I have an Autel MaxiDiag Elite code scanner- live data and code re-setter.

With my Autel and Fluke meter, I quickly figured out the battery was depleted and the alternator was not charging. I have a spare battery that worked and I reset the codes, immediately the car went from misfire to smooth. I figured I had it nailed in the parking lot and was sceptical (as usual) with the codes, being thrown, being anything more than an electrical problem (supply side), but on my way home....

running rough, misfire, codes (some different), but made it to my driveway. I fooled the rear door into being closed while open so I could put my Fluke in line with the neg post and clamp to measure amp draw with modules awake at approx 1.8 amps, a few minutes later amp draw went down to .020 amps, verifying the modules going to sleep as they should.

I ordered an upgrade alternator from 140 amp to 160 amp and replaced the battery with a yellow top Optima DH6- cleaned ground wires and power leads, power fixed.

With a steady supply of power I started on the misfire, #3 cylinder. I swapped the coil from #4 and now I have a misfire in #4, replaced bad coil. Misfire fixed. The random codes are now just one, ECM-4201.

I drove the car for a 130 mile trip out and back while keeping an eye on the live data from the Autel. What was a concern was the O2 rear sensor reading from 0.0 V to .9 V but mostly .6 V to .8 V while the front O2 was steady at .98 V to 1.01 V. But the code was not tripped during that trip. I returned home and went back out, but drove in traffic and tripped the code within 23 min.

I came home and checked the temp of the cat in the front at approx 410F but the rear was 240F, I could not see any exhaust leaks.

I'm thinking I have a partial melt inside the cat? The alt is putting out a steady 14.3 V with a fully charged battery at 12.9 V (float charge adjusted).

My Question,

Before pulling the exhaust (big job) am I missing something?

Cheers

User avatar
oragex
Posts: 4691
Joined: Fri May 24, 2013 6:20 am
Year and Model: S60 2003
Location: Canada
Has thanked: 94 times
Been thanked: 242 times
Contact:
Canada
oragex

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by oragex » Wed Mar 11, 2020 6:12 pm

Hard to speak about melted cat, there is quite a drop in temp indeed. If you drove with a severe misfire, the unburnt gas could damage the cat, and may trigger a Cel intermittently. Your 2004 may also be worth a look at the CEM for any traces of water leak

User avatar
abscate
MVS Moderator
Posts: 20460
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 285 times
Been thanked: 898 times
Trinidad & Tobago
abscate

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by abscate » Wed Mar 11, 2020 7:42 pm

Using AGM batteries in a car designed for FWC batteries might cause charging issues.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

floridavolvo
Posts: 4
Joined: Wed Mar 11, 2020 4:24 pm
Year and Model: 2004 V70 non-turbo
Location: Florida
Has thanked: 0
Been thanked: 0
United States of America
floridavolvo

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by floridavolvo » Thu Mar 12, 2020 3:52 pm

oragex wrote:
Wed Mar 11, 2020 6:12 pm
Hard to speak about melted cat, there is quite a drop in temp indeed. If you drove with a severe misfire, the unburnt gas could damage the cat, and may trigger a Cel intermittently. Your 2004 may also be worth a look at the CEM for any traces of water leak
Thank you for your reply, sounds like you get why I'm a bit puzzled with the last issue and the temp drop.

As to the misfire, since I don't normally drive this car (it's my Wife's) I can't know for sure how long it had been misfiring (the #3 coil was completely dead) but my Wife loves her Volvo's and does come to me quickly when something needs attention (I like them too-they keep what's important to me safe). :wink:

This brings me to the CEM, The power supply side of things is strong and works well, (I have done this type of upgrade in all our Volvo's as it has been needed-works well). Supply is only part of the equation since you are bringing up the CEM, have you had experience with water intrusion and an interruption in the CAN "super-highway"? I had considered a CAN interruption, partly why I'm sceptical of codes at first, but wouldn't this also cause other codes or indicate other problems?

I have a front O2 indicating a strong rich mix (.98V to 1.01V), the heat element is on showing cold? (1536 mA) that would go along with a pegged rich signal? And a rear O2 between lean and rich, (all in closed loop .0V to .9V for extremes and .6V to .8V mostly)

Fuel trim short at 1.04 and long at .98 Again rich? Spark advance at idle pegged at 32 BTDC

Idle 750 rpms with plus or minus 10 rpms

ECT 191 F

Fuel pressure is steady at 55 psi

Fuel pump duty 53%

MAP at 1.6V or 320 hPa

Amb temp read at 82F

IAT 178F

Leak detection pump current 65 mA

Voltage as measured by the ECU at 14V unwavering

All this was measured after a long 130 mile drive at steady speed (load), while idle at home in my driveway.

Does anything scream out at you?

User avatar
abscate
MVS Moderator
Posts: 20460
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 285 times
Been thanked: 898 times
Trinidad & Tobago
abscate

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by abscate » Thu Mar 12, 2020 3:53 pm

Fuel trims are fine.

What is the MAF reading in grams per sec?
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
RickHaleParker
Posts: 3898
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 479 times
United States of America
RickHaleParker

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by RickHaleParker » Thu Mar 12, 2020 4:57 pm

ECM-4201 is Three-way catalytic converter efficiency. Anything that messes with the Air/Fuel ratio or the burn can trip ECM-4201. Including a misfiring cylinder, air leakage in the exhaust system and defective injectors.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger, Plant Ghent Belgium.

floridavolvo
Posts: 4
Joined: Wed Mar 11, 2020 4:24 pm
Year and Model: 2004 V70 non-turbo
Location: Florida
Has thanked: 0
Been thanked: 0
United States of America
floridavolvo

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by floridavolvo » Fri Mar 13, 2020 8:59 am

abscate wrote:
Thu Mar 12, 2020 3:53 pm
Fuel trims are fine.

What is the MAF reading in grams per sec?
.01 lb/s-

or 4.5 g/s at 750 rpm

precopster
Posts: 7475
Joined: Sat Aug 21, 2010 12:20 am
Year and Model: Lots
Location: Melbourne Australia
Has thanked: 4 times
Been thanked: 108 times
Australia
precopster

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by precopster » Sat Mar 14, 2020 1:38 am

That's 16.2kg/hr which is pretty ideal at idle according to Vida.
Current cars:2002 XC70, 2006 Ssangyong Rodius (Stavic), 2006 XC90 2.5T, VW Transporter 2.5TDI

www.precisioncarmodules.com.

floridavolvo
Posts: 4
Joined: Wed Mar 11, 2020 4:24 pm
Year and Model: 2004 V70 non-turbo
Location: Florida
Has thanked: 0
Been thanked: 0
United States of America
floridavolvo

Re: 04 non-turbo v70 ecm-4201- Am I missing anything?

Post by floridavolvo » Sat Mar 14, 2020 11:14 am

precopster wrote:
Sat Mar 14, 2020 1:38 am
That's 16.2kg/hr which is pretty ideal at idle according to Vida.
I appreciate the response, and if the data that I pulled from my Autel is in a proper operating zone, I have to assume that it's correct and actually pointing to the cat failing, right? If I'm not missing anything, then I have a direction at least to prepare for and of course thank all of you that gave this a look.

I will update on what I find in case it might be valuable to someone out there. :)

Post Reply
  • Similar Topics
    Replies
    Views
    Last post