2004 S60 ECM-4801 Cat. Faulty Signal. includes waveform

Post by **xHeart** » 23 Feb 2015, 07:40

vtl wrote:I've heard many times that on these P2s you need to use OE oxygen sensors, since others throws errors.

I will save some to purchase the OE, vtl?
Meanwhile, will this be true for both sensors -- front, and rear?

Post by **vtl** » 23 Feb 2015, 08:43

Hard to say. Rear one really depends on how well front sensor works. Front one has also more complicated design. I'd put my bet on front one, but would spend some time looking at it in VIDA.

Post by **xHeart** » 23 Feb 2015, 09:59

vtl wrote:Hard to say. Rear one really depends on how well front sensor works. Front one has also more complicated design. I'd put my bet on front one, but would spend some time looking at it in VIDA.

Thank you vtl. I will.

Exploring it further...
I was looking at my notes, and checked several threads on MVS. There is this aging small harness issue associated with rear HO2. JRL recommends replacing rear with Volvo PN 9186934 (not Bosch 16199) for $154 which come with this mysterious small harness - but cannot see it in the diagram http://volvopartslisle.com/assembly/78021094/Fuel-System.

Post by **xHeart** » 24 Feb 2015, 09:17

Some more tinkering with VIDA.

The Erase DTC, and then ECM reset step in VIDA is explained - 1500 rpm followed by idling.

Is "trim reset" after replacing HO2 sensors a separate step (like adaptation)?

draser · Post by **draser** » 24 Feb 2015, 10:28

For trim reset: if you zero out after replacing o2 sensors is fine, if you don't the LTFT will automatically adjust to new values. The LTFT value is saved to KAM memory and reused. If you record the before and after you'll know if replacing the sensor actually made a difference. Before replacing the sensors it's nice to assess their condition if you can pull live data. Just to confirm that it's the sensor that's at fault and the bad fuel trim is due to sensor.

Post by **xHeart** » 27 Feb 2015, 07:59

draser wrote:For trim reset: if you zero out after replacing o2 sensors is fine, if you don't the LTFT will automatically adjust to new values. The LTFT value is saved to KAM memory and reused. If you record the before and after you'll know if replacing the sensor actually made a difference. Before replacing the sensors it's nice to assess their condition if you can pull live data. Just to confirm that it's the sensor that's at fault and the bad fuel trim is due to sensor.

Thank you for the pointers.

I would assume, when taking the read this weekend the LTFT would show lower % -- closer to STFT?

After reading little more, the circus is at bank 1 -- bank 2 is not applicable to 5-cylinders?
What is LR: close loop operating with two sensors? I have counted 5 from MAF to rear H02.

draser · Post by **draser** » 27 Feb 2015, 08:39

There's only a bank one for these engines. Long trim will adjust after some driving, hopefully ends up in single digits close to zero. Short trim adjusts faster, but should be single digits at idle fully warm.

Post by **xHeart** » 28 Feb 2015, 17:17

Here are few screenshots from today. Frozen values, Live data @ 640, 2200, 3720 rpm.
STFT and LTFT has improved since 2/14 read.

: Frozen values from 2/28 read

Live data:

: Live data side by side @ 640, 2200, and 3720rpm; MVS_TWCscrn_ParameterECM4801.png (12.15 KiB) Viewed 1577 times

: Live graphic view 640-2080rpm

draser · Post by **draser** » 01 Mar 2015, 14:59

Fuel trims look good, meaning there are no air leaks, fuel delivery is as it should be and ignition works well. The only parameter that is different than my car readings is MAF. Your reading is higher than what I have, 2.7 g/s at idle, but after the conversion you are at 3.nn so it's pretty close. Does the car drives and feels okay?

Post by **xHeart** » 02 Mar 2015, 08:50

draser wrote:Fuel trims look good, meaning there are no air leaks, fuel delivery is as it should be and ignition works well. The only parameter that is different than my car readings is MAF. Your reading is higher than what I have, 2.7 g/s at idle, but after the conversion you are at 3.nn so it's pretty close. Does the car drives and feels okay?

Thank you for the empowering feedback, dr.

The live data was captured in our home garage, not on the road.

It had frequent hesitation issues in July 2014 -- the engine will cut-off in the middle of a drive. It did not go away completely, but less frequent after replacing all Spark Plugs and Ignition Coils, these were original.

ETM was replaced DEC 2013 with new MM after comments from Mike Locas of Melbourne.

Several DTCs related to MAF, HO2, and Brake Pedal Position were present when first time hooked up to then recently acquired VIDA-DiCE, Fall 2014.

MAF sensor was cleaned with CRC before a road trip close to thanksgiving 2014 -- the 1000 miles road-trip was without engine cut-off incident. Cured, NO!, slight hesitation then returned soon after, suspected the engine cut-off will follow.

It has been running well, no engine cut-off, after the MAF was replaced in December 2014. The air-filter is close to three years old.

Except for the avg 14.4 mpg, it runs exceptionally well, responsive after replacing both front and rear HO2 sensors. No odor or fumes in our heated home garage.

2004 S60 ECM-4801 Cat. Faulty Signal. includes waveform

Re: 2004 S60 ECM-4801 Cat. Faulty Signal. includes waveform