purchased 1992 jdm h22a out of prelude, installed into my 1996 ex accord using the accord harness modifed onto the h22a, i purchased a obd2a to obd1 conversion harness and ran it between the p13 and the underdash. it starts and sounds great like a sewing machine, but it throws an cel. So i was pretty sure every tech i read said i should swap pins a6 and a11 saying the egr and o2 are swapped, but the wiring diagram shows a6 going to the 02 sensor for both the prelude engine(h22a) and the accord underdash. it does however have pin a25 on the h22 going to the pgm-fi relay while this is a11 on the accord. the conversion harness i got didn't even have a pin in a11 on the ecu side, and it had a25 h22 going to pin a11 accord. I can't make any sense out of this and i'm really looking for some guidance on this. I've had the engine in a month now and i can't get it to go over run without the check engine light. If someone can get me a workable answer on this i'll make it worth their time, in parts or other honda goodies i have access to. Thanks in advance.
Gibby the REd

 

bump

 

i had the same problem and didn't fix it

 

Whats the last three digits of the ECU? Its not A12 is it? I sent you a pm, I dont know if that will help you or not but its worth a try.

 

thanks for the help, i do have the wiring diagram for the 1992 prelude and the 1996 accord and they both say that a6 is the primary heated oxygen sensor, the difference is in pin a11, on the accord it shows all going to the pgm-fi relay and on the prelude it shows this going to the egr, now tracing the wires through the diagram the main relay puts power to quite a few of the engine components, but i've tried putting a25 prelude to a11 on the accord but it still gives me code 41. i'm pretty bummed, i don't have the ecu here, its at my grandfathers shop and that kind of makes it hard too since its an hour away. Anyway any thoughts from anyone would be great let me know.
Gibby

 

UPON DOWNLOADING ANOTHER MANUAL FROM HONDAHOOKUP, I SEE WHY SOME PEOPLE SAY PIN A11 SHOULD BE GOING TO THE O2 SENSOR. I HAVE TRIED THIS ON MY ACCORD WITH THE H22 AND I STILL GET THE TROUBLE CODE 43 WEATHER OR NOT I HOOK UP A6 TO A11, WHY WOULDN'T I GET THE EGR TROUBLE CODE AS WELL?? NO MATTER IF I HOOK IT UP STRAIGHT A6 TO A6 OR SWAP A6 TO A11 I STILL GET CODE 41 O2 SENSOR. STILL DIDN'T NOTE THE ECU NUMBER.
GIB

 

Hook up the heated O2 wire to pin A6. Then try the following.

• Reset your ECU (disconnect your battery (-) for 30 seconds)
• After you reconnect the battery start the engine
• Does your CEL on and does it indicate DTC 41?

• No
- intermittent failure, check for poor or loose connections between HO2S and A11

• Yes
• Turn engine off
• disconnect the connector from the O2
• With a multimeter check the resistance between terminals 3 & 4 on the O2
• Is there 10-40ohms?

• No
- Replace O2 Sensor

• Yes
• Check for body ground on terminals 3 & 4 individually of the O2
• Is there continuity

• Yes
- Replace O2 Sensor

• No
• Check for continuity between terminal 4 and terminals 1 & 2 individually
• Is there continuity

• Yes
- Replace O2 Sensor

• No
• Turn ignition switch on
• At the O2 harnes measure voltage between YEL/BLK (+) and ORN/BLK (-) Term.
• Is there battery voltage

<FONT COLOR="red">• Yes</FONT> follow red instructions
<FONT COLOR="blue">• No</FONT> follow blue instructions

<FONT COLOR="red">• Yes
• Turn ignition off
• disconnect the A connector from the ECU
• Turn the ignition switch on (II)
• At the O2 harness, measure voltage between YEL/BLK (+) & ORN/BLK (-)
• Is there battery voltage

• Yes Repair short in ORN/BLK wire between A11 and O2

• No
• Turn ignition off
• Reconnect O2 connector
• Prod an ammeter between terminals A11 (+) & A26 (-)
• Turn ignition on (II) * Monitor over a 5min period unless the current drops below 0.1A imediately.
• Is the current less than 0.1A

• Yes Relpace O2 Sensor

• No Replace ECU with a known-Good ECU and recheck for DTC 41. If DTC 41 goes away replace ECU.


</FONT>
<FONT COLOR="blue">• No
• Measure voltage between YEL/BLK (+) and body ground
• Is there battery voltage

• No
• Repair open in YEL/BLK wire between O2 and PGM-FI Relay

• Yes
• Turn ignition off
• Reconnect connector to O2
• Turn ignition on
• Measure voltage between A11(+) and A23(-) at the ECU
• Is there battery voltage?

• No
• Repair open in ORN/BLK wire between A11 and the O2

• Yes
• Change ECU for known-Good ECU and recheck. If DTC 41 goes away replace original ECU.</FONT>

If this seems to confusing to follow let me know and I'll send scan in the two pages and send them to ya via email. Or you could go and buy yourself a shop manual from the Honda dealership for your Accord or a good Helms manual.


Modified by GhostAccord at 4:24 PM 2/5/2008

 

thanks Ghost, I've already bought a brand new sensor and soldered a connector to it. i also tried to run the wiring straight from the sensor to the ecu, but i have not yet checked the grounds you suggested. as well as a few of the other steps, the ecu numbers are 37080-p13-no1
552 JMT
says 3no on either side of the label but perpendicular to the about text.
so on the recap i'm still trying to put this h22a jdm from a prelude into my accord and going from obd1 engine to obd2a vehicle and all i get is cel light with code 41.
thanks again
gibby

 

I dont know if this will help you, but I made my own harness for 96 accord ex obd ii to i and I had to pin to the 2nd O2 sensor to get the cel out.