Hey guys,
This is a procedure on cleaning the throttle body as per Helms manual for an '06.

Step 5: Reset the ECM with the HDS.

What is the HDS? Is it something the dealers tech. use? Where can I get one? How much?

Thanks for the help.

--Tomas

 

HDS = Honda Diagnostic System. Could be as much as $7000.00
http://www.helminc.com/helm/honda_diagnost...KNLXMMXSQQM7D12
It's made by Teradyne Systems, can't find their link right now.

 

Can I do this procedure with just taking the negative off the battery terminal?

 

I'll tell you what I have read because I don't really know. There is probably a procedure for reseting the 06 ECU without the HDS. I have read that removing the #25 backup fuse from the cabin fusebox for 60 sec. no longer works. This is the preferred no HDS ECU reset method up to MY05.
The 06 ECU itself dosen't like being disconnected for like 10-15 minutes after shutting the car off. I don't know if that applies to having it's power taken from it by disconnecting the battery. If I were going to try it I would wait about 15 min. after shutting the car off. Disconnect for a few min also, maybe 5 or 10, I don't really know. Also make sure you have your radio code if you have the OEM stereo (I'm assuming thats still the same). Also I don't know how you could confirm the ECU reset except by "feel" unless you have some kind of generic extended CAN scan-tool to check for the OBD-II readiness codes (smog codes that are reset with an ECU reset and take a little ECU "learning" time to "set" I guess the term would be).
I hope if someone knows if there is a better way for an 06 they post it. I want to know as well.

 

one thing i found out that even though the 06 is an OBDII you need to have a scan tool that is compatible with 06+ and before. i found this out after my boss's car (an MY06) threw a cel and the scan tool wouldnt communicate. but i have cleared codes on my car which is an 05. in the end we bought a new scan tool conpatible for 07 and below cars.

 

I think they call the new protocol extended CAN (Controller Area Network). I guess there are two types of CAN, one has an 11bit header and the other has a 29bit header. The new Honda's use the 29bit version. Before that the MY00-05 S2000's use the ISO-9141 protocol for OBD interface.
EDIT: Also clearing DTC's via scantool is not the same as actual ECU reset. Not that anyone said that, I'm just throwing it in.

 

Let me make a recommendation:

I borrowed one of those OBD2 scanners from autozone when my car threw a CEL last week. I was able to not only get the code through the scanner and find what was wrong with the car checking my service manual, but the scanner itself allows you to erase the codes as well.

Once you erase the codes, the CEL will go away.

 

He dosen't have a CEL. That is good info though.

 

I have an '06. Disconnecting the battery will reset the ecu. Out of habbit (developed with other cars), I disconnect overnight, but probably needs only 20-30 min. Like another poster said, probably good to wait 20min after last shut off before messing with it because of the self test.

After reset, the first engine start will be quite a bit harder (takes more cranking), and you will notice immediately the exhaust smelling really rich. If you measure your gas milage during the first 1/4 tank or so after reset it will be really bad. Starts getting better again by about 1/2 tank. Takes about 1.5-2.5 tankfuls before its has really (re)learned your engine.

There's also another way you can check to see if you did reset the ecu - check to see if the self-diagnostics are ready. This is done by turning on the key (but not starting) and wait for 20 seconds. If the check engine light goes off then the diagnostics have been done, but if it flashes 5 times instead, they have not.

So what you'd do is check the diags before you reset, to verify they indeed have been done, and after reset you can check again to verify that they have not been done.

(Getting the diags done will take a few miles (or even up to a tankfull). If you want to speed up the diags, there's a driving procedure in the owner's manual. This is in case you replace/disconnect the battery (e.g. reset the ecu) right before going for smog test.)

After an ECU reset you're supposed to do the idle learn too, which is just idling for 5 minutes straight with fully warmed engine and with no extra load on engine, so don't count radiator fan-on time in the 5 min.

I think that resetting the ECU makes sense after any significant engine mod, including cleaning the throttle body, or, the next tankfull or so after using a bottle of techron fuel system cleaner in a tankfull of gas. In my opinion, even though the ECU is a learning unit and will retune for mods you make, you still get a better end result by starting from scratch/reset than by letting it just relearn with still some memory of old (e.g. w/o reset). (It is as if it never fully forgets all of the old w/o a reset.)

 

[QUOTE=ottokrat,Feb 21 2007, 08:35 AM] I have an '06.