Sol-8-GSR

OK i just finished up a 96 gsr swap with a obd1 jdm p72 in my 93 del sol si fires right up only problem is I'm getting cel code #41 Ive replaced the o2 with a bosch direct fit reset the ecu and still got the same code any help is greatly appreciated

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check the wiring (trace it all the way to the ECU looking for a short or somnething. and also check if its getting voltage at the ECU

Sol-8-GSR

did the ohm test good there

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hmmm..not sure if the JDM ECU runs a 2 or 3 wire o2 sensor or somehting idk lol. good luck dude

Sol-8-GSR

i found a pinout im going to wire the o2 right to the ecu see if that works

Former User

The code is for the heater element of the O2 sensor. This circuit in 96-00 Civics is protected by dash fuse #15. Is it blown?

Sol-8-GSR

its gonna be different on my car what is fuse #15 on your car

Former User

Disregard my original comment. I see you have a 93 Del Sol.

Check the power wire for battery voltage and wires running between the O2 sensor and ECU for an open or short.

Sol-8-GSR

has anyone had problems with bosch o2 sensor's?

I re-wired the 02 to the ecu
1 black wire to A6

2 black wire to A23

3 green wire to D23

4 white wire to D14

I still have code 41 after I reset the ecu

is there any differance between the jdm p72 and usdm p72 *no they are the same*

Sol-8-GSR

bump ttt for some help i rechecked all the wiring everything is good i replaced the bosch sensorn with a denso disconnected the battery & back up fuse for 2hrs and this code 41 is still there

Former User

Only three of the four O2 sensor wires should pin to the ECU. The heater power wire pins to the main relay where it gets battery voltage. Not sure but the black wire currently pinned to A23 may need to run to the main relay.

Sol-8-GSR

so i should move this black from a23 to a25 instead

Former User

You need wiring diagrams for your car and ECU. One of the four O2 sensor wires does NOT pin to the ECU. Instead, it runs to the main relay. You currently have all four O2 sensor wires connected to the ECU. This is incorrect. Also verify that the other three O2 sensor wires are correctly pinned to the ECU.

The main relay wire that provides power to the O2 sensor heater element also branches to ECU A25.

Sol-8-GSR

ive been going by these diagrams

http://images.google.com/imgres?imgu...DuD_8AbOl6jcCw

Sol-8-GSR

thanks for the help i dont know how many diffrent post,digrams with the same problem most with no solution im gonna give it one more shot tomorrow

http://www.hondatech.com.au/forum/showthread.php?t=225

Former User

Yes, the diagram for the OBD1 P72 ECU is the one you need.

In your earlier post, D23 should be D22.

The power wire from the main relay to the O2 sensor heater element and ECU A25 is a Yel/Blk wire.

Sol-8-GSR

Im making a new harness right now Ive got the wires tagged and ready to go its too dark to try it now but ill post the results tomorrow

Sol-8-GSR

I re-wired a New denso 02 to the ecu

1 black wire to A6

2 black wire to A25

3 blue signal wire to D23

4 white ground wire to D14

reset the ecu ran the car at idle for 20 mins still no luck the cel pops on with in 3-5 sec after it is started

I also found a good used oem honda o2 tried that and still getting this code

I even ran the car with NO o2 and only came back with code 41

the car runs fine has no hesitation runs a lil rich other then that its this freaking stupid yelllow light could the ecu be bad ? only other thing i can think of
anyone got a obd1 p72 for sale

Former User

Get the multimeter out. Do you measure battery voltage at the heater element power wire with the key in ON(II). Does the heater element ground wire have continuity?

You know that the power wire for the heater element does not actually pin directly to A25, right?

Sol-8-GSR

could you tell me how this should be done?
can i run both to A6?

Sol-8-GSR

bump for some help!!!!!!!!!

Sol-8-GSR

bump back ttt

I still need some help anyone one else have this code after a swap ?

skaternak

change to usdm ecu will fix the problem

Sol-8-GSR

im gonna pick one up this weekend hopefully it will fix this problem