Being that the Accord and Odessy share platforms I thought I'd ask here, does anybody know where the 2-wire ECU jumper is on an '01+ Accord/Odessy? I need to pull a code from a friends van but the jumper isn't in the same spot it is in Integra/Civic chassis.. thanks.

 

for 98-02 Accords, you would need to use the plug described in this thread:
https://honda-tech.com/zerothread?id=993196

I'm not sure where the plug is for Odysseys.

 

Turn the ignition key On (engine not running) and make sure the Check Engine light on the instrument panel is on. If the light is off, replace the bulb. After verifying the bulb is good, turn the ignition key Off.

Locate the Data Link Connector (DLC) (under the instrument panel on the driver's side, looks like it's just above the hood release) and using a small jumper wire, connect terminals 8 and 13. Be careful not to damage the terminals in the DLC.

You can see a picture of the DLC here:
http://mywebpages.comcast.net/....html

Or, copying philadd's description from the other thread:

./.1..2..3..4..5..6..7..8.\
/9.10.11.12.13.14.15.16\

Anyway, just connect #8 and #13.

Turn the ignition key On and observe the Check Engine light on the dash. It will flash the trouble codes in a clear and distinct manner. The first long flash will represent the first digit of the code. The second digit of the code will flash using short flashes. For example, four long flashes will represent the first digit, 4, followed by two short flashes is code 42. Record all the trouble codes onto a notepad and observe the computer codes once again to double-check the accuracy as the PCM repeats the list of trouble codes after all the codes have been displayed once time. If there are no trouble codes stored, the Check Engine light on the dash will not flash.

To clear the codes, remove the #13 fuse on the passenger's side fuse/relay panel. Do not disconnect the battery to clear the codes as this will erase the stored operating parameters from the memory and cause the engine to run rough for a period of time while the computer relearns the information.

Here's a list of codes and what they mean:
http://www.troublecodes.net/honda/hondaobd2.shtml

Or, just go to Autozone and ask them to use their SCAN tool programmed to read the codes. And consider picking up a Haynes manual, only ~ $13 or $14 new.