Need an ECM - VTXOA
 
LinkBack Thread Tools
post #1 of 10 (permalink) Old 11-12-2016, 07:16 PM Thread Starter
Senior Member
 
Join Date: Dec 2003
Location: Houston, TX
Posts: 230
Need an ECM

I have a 2002 VTX1800C It had been running real rich even for an 02. I had an error code for the MAP sensor. I checked the voltages and they were good so I replaced the module. Still get the code. The manual said the last potential problem was the ECM. I cleared the codes and ran it a few minutes. Now when I check codes again I get a solid red light. Looks like it is the ECM. The one in it is a 38770-MCH-671 which I understand has been replaced with 38770-MCH-772. Perhaps the replacement doesn't run quite as rich as the origional 02's. The dealer wants $1,000 and can't be sure that it is actually the problem and if it doesn't fix it the part is still mine. On line I see them new for $609. That is too much money to part with not being sure it will fix it. On Ebay I see Honda ECMs from $80 to a couple hundred used but none are listed right now with the right numbers for my bike. I'll keep looking there but I thought I would ask if anyone here had one they wanted to part with.
BrunoK is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 11-12-2016, 08:09 PM
Senior Member
 
Hans&Feet's Avatar
 
Join Date: Jun 2005
Location: Conyers/McDonough, GA
Posts: 8,094
Garage
You need to check +12v Bl/w wire at Engine stop relay... Y/R wire +5volts for the sensors..
Read link below..... Bare also has more info on trouble codes.

http://tech.bareasschoppers.com/tech...d-main-wiring/
Affects 2002...

http://rs1185.pbsrc.com/albums/z350/...h=480&fit=clip

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 178,645 miles of smiles

Last edited by Hans&Feet; 11-13-2016 at 02:40 PM.
Hans&Feet is offline  
post #3 of 10 (permalink) Old 11-12-2016, 09:04 PM
Senior Member
 
Join Date: Mar 2006
Location: Everett Wa 98204
Posts: 3,113
Find someone local and swap for a ride to see if problem is still there.

05 1300S 6901 miles at start 114600 now
03 1800 R 64100 at start 80500 now dyno results 97.55 HP 110.22 torque
80550 E4 front
Charlie D is online now  
 
post #4 of 10 (permalink) Old 11-13-2016, 08:20 AM
Senior Member
 
Join Date: Oct 2013
Location: Tampa Bay
Posts: 500
Pull your ECM out and send it to someone on the forum to test on their bike?
You're (probably) going to pull yours out of the bike anyway.
If it gets lost in shipping it was probably broken anyway.
If there's something about your bike that breaks ECM's (inconceivable) the other guy didn't run that risk.
TurnOne2000 is offline  
post #5 of 10 (permalink) Old 11-13-2016, 08:40 AM
Senior Member
 
chuck_VTX F's Avatar
 
Join Date: Aug 2007
Location: Upper Right Ohio & South Texas
Posts: 6,019
Garage
have you Ohm'ed out the wires.. ??? the 1300 has major issues with ecm wires going to ECM. the 1800 wires are not much stronger.

wire breaks inside insulation.. and insulation does not break.. so looks OK. till ohm'ed.

try to find someone local to swap ECM. my bet is wires. as ecm failures are rare.
.
.



2005 VTX1800 "F" type II, Silver Tribal, 73,000 Miles, Purchased Feb, 2005.

MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
chuck_VTX F is offline  
post #6 of 10 (permalink) Old 11-14-2016, 10:03 AM Thread Starter
Senior Member
 
Join Date: Dec 2003
Location: Houston, TX
Posts: 230
Thanks for the input. The voltage is within spec for all three wires to the MAP sensor so I don't think it is a wiring issue. Finding someone to swap with for a test would be ideal, but I don't know anyone else here in Houston with an 2002 1800c to try my ECM.
BrunoK is offline  
post #7 of 10 (permalink) Old 11-14-2016, 10:08 PM
Senior Member
 
Hans&Feet's Avatar
 
Join Date: Jun 2005
Location: Conyers/McDonough, GA
Posts: 8,094
Garage
Do you get fuel pump prime???

What voltages do you get for the MAP sensor wires???
Attached Images
File Type: png 1800 PGM-FI MIL blinks.png (146.3 KB, 3 views)

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 178,645 miles of smiles

Last edited by Hans&Feet; 11-14-2016 at 10:23 PM.
Hans&Feet is offline  
post #8 of 10 (permalink) Old 11-17-2016, 12:21 AM Thread Starter
Senior Member
 
Join Date: Dec 2003
Location: Houston, TX
Posts: 230
The voltages are in the high but acceptable range according to the manual. I don't remember exactly but it was around 5.25v. The pump is fine. The bike runs but not real well, it seems to be running from the default mixture tables rather from the computer. I cleaned the plugs and they carbon up after just a few miles.
BrunoK is offline  
post #9 of 10 (permalink) Old 11-17-2016, 02:09 AM
Senior Member
 
Join Date: Jul 2008
Location: Chiang Mai, Thailand
Posts: 1,793
I suggest changing out the fuel pressure regulator and related vacuum hose if for nothing else than to tick it off the list as possible causes of running a rich mixture.
Sojourner is offline  
post #10 of 10 (permalink) Old 11-17-2016, 09:55 AM
Senior Member
 
Hans&Feet's Avatar
 
Join Date: Jun 2005
Location: Conyers/McDonough, GA
Posts: 8,094
Garage
TPS, Baro and Map sensors get +5v Y/R and Ground is Green/Orange.
Green/Orange is a sensor ground only for IAT, ECT plus the above three sensors.
Test the +5v to the sensor ground(G/O). Verify continuity back to the ECM connector.

ECM has three Grounds to the "Common Electronics" ground bolt on the front Ignition coil.
One Green wire and two Green/Pink wires--verify continuity from Ground bolt to the ECM terminals.

Engine running in "Failsafe" mode = limp home mode...

Many early 1800 have had FPR fail. 1800 runs extremely rich when FPR fails.
Lack of vacuum to FPR looks like WOT so fuel line pressure is high = richer mixture.

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 178,645 miles of smiles

Last edited by Hans&Feet; 11-17-2016 at 10:03 AM.
Hans&Feet is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the VTXOA forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome