Does the 'dreaded' *070 BCM even exist?

**jeff652** · 01-27-2012, 03:40 PM

Trying to clear up some confusion (may just on my part, maybe not) regarding the *070 BCM that is said to adversly affect MPGs. I am starting to believe that this item (it would be Honda part # 1K100-PHM-070) does not exist!

Here is one of the most definitive comments I could find on the board regarding the negative charecteristics of the "070 BCM". This comment is from Ron (HBR), who is in a very good position to know what he is talking about on this stuff: Need part numbers for 2000 M/T IMA battery BCM MCM
Note the comment is a little vague when referring to the -070 unit. It does not list a full part number and does not specify whether the -070 unit that should be avoided is a BCM or MCM.

Here is another comment, also by Ron that mentions the 070 BCM in connection with the 010, 020, and 030 versions that we are all very familiar with: BCM, MCM & ECM Revisions
Perhaps this comment is where the belief that there is a 070 BCM came from.

I cannot find anyone this board who will actually acknowledge owning a 1K100-PHM-070 BCM. I searched eBay, and there are none available online (one that appears to be for sale here, but it is actually a MCM - note the part# in the photo:

Finally, if you want to buy a BCM from Honda today, you are going to buy the A01 version (link here), which means if the 070 BCM was released in 2008 as we believe, it would have already been superseded by the A01 - But there are several people on this forum who will attest to received the A01 BCM long before 2008.

I am starting to think this thing doesn't exist. Does anyone have an actual picture of one of these or will attest that they have one in their Insight?

If it does not exist, then I have some questions:
(1) is the 070 MCM 'bad' as perhaps Ron was trying to say (i.e. not the BCM after all) and is hurting MPGs?
(2) If it is 'bad', why are my MPGs so good even though I am driving on this version of the MCM (on pace to get 950 miles from a single tank)
(3) How much improvement would someone expect from an older version MCM, as I see from the spreadsheet that a lot of us are on the 070 MCM

P.S. - Here's an interesting comment citing a Honda TSB that lists the 060, 070, and 305 versions of the MCM as "good" and stating that the unit should be replaced only if it is not one of the above listed:
Need part numbers for 2000 M/T IMA battery BCM MCM

Eli · 01-27-2012, 03:44 PM

I think it's just sloppy terminology. We should be saying dreaded A01 BCM, since 070 is an MCM part number and AFAIK doesn't have anything to do with lowering MPG because of background charging.

Like I said, I received an A01 BCM and an 060 MCM in early 2010 with my warranty replacement.

I believe the latest BCM revision is still A01, but we've gone on to 070 for the MCM.

**jeff652** · 01-27-2012, 04:53 PM

Quote:

Originally Posted by Eli

I believe the latest BCM revision is still A01, but we've gone on to 070 for the MCM.

Yup, that is what was in my car when I bought it, and the previous owner had all the recalls performed.

I think I want to find an older MCM just for kicks.

gilbertguy · 01-27-2012, 05:04 PM

jeff652,

I see you have added your info to the BCM/MCM info data base, hopefully we can get more people on the forum to add their car data here also.

https://docs.google.com/spreadsheet/...Va0JUalE#gid=0

diamondlarry · 01-27-2012, 06:01 PM

Quote:

Originally Posted by jeff652

Trying to clear up some confusion (may just on my part, maybe not) regarding the *070 BCM that is said to adversly affect MPGs. I am starting to believe that this item (it would be Honda part # 1K100-PHM-070) does not exist!

Here is one of the most definitive comments I could find on the board regarding the negative charecteristics of the "070 BCM". This comment is from Ron (HBR), who is in a very good position to know what he is talking about on this stuff: Need part numbers for 2000 M/T IMA battery BCM MCM
Note the comment is a little vague when referring to the -070 unit. It does not list a full part number and does not specify whether the -070 unit that should be avoided is a BCM or MCM.

Here is another comment, also by Ron that mentions the 070 BCM in connection with the 010, 020, and 030 versions that we are all very familiar with: BCM, MCM & ECM Revisions
Perhaps this comment is where the belief that there is a 070 BCM came from.

I cannot find anyone this board who will actually acknowledge owning a 1K100-PHM-070 BCM. I searched eBay, and there are none available online (one that appears to be for sale here, but it is actually a MCM - note the part# in the photo:

Finally, if you want to buy a BCM from Honda today, you are going to buy the A01 version (link here), which means if the 070 BCM was released in 2008 as we believe, it would have already been superseded by the A01 - But there are several people on this forum who will attest to received the A01 BCM long before 2008.

I am starting to think this thing doesn't exist. Does anyone have an actual picture of one of these or will attest that they have one in their Insight?

If it does not exist, then I have some questions:
(1) is the 070 MCM 'bad' as perhaps Ron was trying to say (i.e. not the BCM after all) and is hurting MPGs?
(2) If it is 'bad', why are my MPGs so good even though I am driving on this version of the MCM (on pace to get 950 miles from a single tank)
(3) How much improvement would someone expect from an older version MCM, as I see from the spreadsheet that a lot of us are on the 070 MCM

P.S. - Here's an interesting comment citing a Honda TSB that lists the 060, 070, and 305 versions of the MCM as "good" and stating that the unit should be replaced only if it is not one of the above listed:
Need part numbers for 2000 M/T IMA battery BCM MCM

Very interesting information and thoughts. In response to #2 above, perhaps if you were someone that used assist extremely sparingly (as I do-drove 52.4 miles today and never dropped below 19 bars and was at 20 bars >50% of the time), the MCM won't have a negative impact? I too would like to experiment with maybe an 010 or 020 BCM and an 060 MCM.

**Hybrid-Battery-Repair** · 01-30-2012, 03:42 PM

I never said there was a 070 BCM. The 070 set comes with an A01 BCM and a 070 MCM. I didn't specify it as an A01 BCM because CVT Civics have A01-A05 MDMs and I didn't want to confuse anyone.

I've also seen A01 BCMs with 060 MCMs.

Quote:

Originally Posted by jeff652

Trying to clear up some confusion (may just on my part, maybe not) regarding the *070 BCM that is said to adversly affect MPGs. I am starting to believe that this item (it would be Honda part # 1K100-PHM-070) does not exist!

Here is one of the most definitive comments I could find on the board regarding the negative charecteristics of the "070 BCM". This comment is from Ron (HBR), who is in a very good position to know what he is talking about on this stuff: Need part numbers for 2000 M/T IMA battery BCM MCM
Note the comment is a little vague when referring to the -070 unit. It does not list a full part number and does not specify whether the -070 unit that should be avoided is a BCM or MCM.

Here is another comment, also by Ron that mentions the 070 BCM in connection with the 010, 020, and 030 versions that we are all very familiar with: BCM, MCM & ECM Revisions
Perhaps this comment is where the belief that there is a 070 BCM came from.

I cannot find anyone this board who will actually acknowledge owning a 1K100-PHM-070 BCM. I searched eBay, and there are none available online (one that appears to be for sale here, but it is actually a MCM - note the part# in the photo:

Finally, if you want to buy a BCM from Honda today, you are going to buy the A01 version (link here), which means if the 070 BCM was released in 2008 as we believe, it would have already been superseded by the A01 - But there are several people on this forum who will attest to received the A01 BCM long before 2008.

I am starting to think this thing doesn't exist. Does anyone have an actual picture of one of these or will attest that they have one in their Insight?

If it does not exist, then I have some questions:
(1) is the 070 MCM 'bad' as perhaps Ron was trying to say (i.e. not the BCM after all) and is hurting MPGs?
(2) If it is 'bad', why are my MPGs so good even though I am driving on this version of the MCM (on pace to get 950 miles from a single tank)
(3) How much improvement would someone expect from an older version MCM, as I see from the spreadsheet that a lot of us are on the 070 MCM

P.S. - Here's an interesting comment citing a Honda TSB that lists the 060, 070, and 305 versions of the MCM as "good" and stating that the unit should be replaced only if it is not one of the above listed:
Need part numbers for 2000 M/T IMA battery BCM MCM

**jeff652** · 01-30-2012, 03:50 PM

Quote:

Originally Posted by Hybrid-Battery-Repair

I never said there was a 070 BCM. The 070 set comes with an A01 BCM and a 070 MCM. I didn't specify it as an A01 BCM because CVT Civics have A01-A05 MDMs and I didn't want to confuse anyone.

I've also seen A01 BCMs with 060 MCMs.

Thanks for clarifying! I appreciate it. So I do/did have the undesirable 070 set. Very interesting. Can't wait to see how the car does with the original 030MCM/010BCM combo!

**jeff652** · 02-03-2012, 05:46 PM

I know some people may already know this, but I want to demonstrate it through objective evidence that the 070 MCM is NOT the source of the MPG hit that many MPG maximizers want to avoid. Rather the A01 BCM is the real culprit.

I obtained this single tank result using an 070 MCM and 030 BCM:

While I was driving on my A01 BCM, high 70s to very low 80's MPGs was the maximum I could obtain. So from now on it will be the 'dreaded' A01 BCM if your goal is maximizing MPGs. The A01 BCM is best for protecting your battery, as the hidden regen on it is great for refilling the battery and keeping it charged.

gilbertguy · 02-03-2012, 11:04 PM

Wow congrats, I'm jeolous! I've got the 060 BCM with the A01 MCM, now I'm wondering what I would be able to get if I had the 030BCM like you? If I'm running on the HWY at 55 I can get in the 80's but that is not normal driving for me, with about 50/50 mix city/Hwy I am getting low 70's. Constant stopping at lights kills MPG.

**jeff652** · 02-04-2012, 04:28 AM

Quote:

Originally Posted by gilbertguy

Wow congrats, I'm jeolous! I've got the 060 BCM with the A01 MCM, now I'm wondering what I would be able to get if I had the 030BCM like you? If I'm running on the HWY at 55 I can get in the 80's but that is not normal driving for me, with about 50/50 mix city/Hwy I am getting low 70's. Constant stopping at lights kills MPG.

I saw approx a 10 MPG jump when going from the A01 to 030 BCM, but I did notice the lack of hidden regen charging, so I had to focus more to strategically regen the battery. It's all a balancing act, but it was a good trade in my opinion!