95 prelude ukdm with jdm h22a

DaveRobbo82 · Post by **DaveRobbo82** » Sun Mar 06, 2016 6:00 pm

I have a 95 ukdm 2.0 manual prelude and I put a jdm h22a with the original h22 loom. Everything is connected up as it should be but I'm getting code 20 and 22... ELD and OIL PRESSURE SWITCH. I've changed the eld but still the same out come and wired the switch up as the 2.0 didn't have the vtec wires... But when I connect the the 2.0 ecu I have no fault codes and the engine ran good for a mile the a management light come on and went into limp mode. When I turned the engine off the code went away so I never got chance to check it. I put the h22 ecu back on which is a p13 and the codes 20 and 22 came back. I'm baffled as why it'd doing this. Any one done this swap before and could help me out please? Cheers Dave

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Mar 06, 2016 7:42 pm

EDIT: Scratch 5th gen comment that was originally in this line - I was getting this thread confused with another members thread where he was swapping 4 and 5 g engines about

For code 22, I would suggest belling out the vtec pressure switch wiring all the way from the ecu pin to the pressure switch connector. If that checks ok, take the spool valve off the side of the head, check the filters and the valve are clean. If they're OK, then change the pressure switch and try it again.

For code 20, check the service manual and compare the wiring diagrams that are relevant on that circuit between the 2.0 and 2.2 to see if there are any differences. If not, follow the fault finding procedure in the service manual for code 20.

The engine definitely won't run right with the 2.0 ecu in place, don't even try to run it with that ecu installed.

DaveRobbo82 · Post by **DaveRobbo82** » Mon Mar 07, 2016 6:27 pm

Cheers. Been told I need a ecu harness as mine is obd1 and the new engine and ecu are obd2a. Mines a bb3 and the engine and ecu were out of a bb4

'92 Si VTEC · Post by **jjmartin349571** » Mon Mar 07, 2016 6:40 pm

If the engine and ECU came out of a BB4 then they should both be OBDI

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Mon Mar 07, 2016 9:48 pm

Exactly that ^^^^

Did the ecu come from the same car as the engine?

DaveRobbo82 · Post by **DaveRobbo82** » Mon Mar 07, 2016 10:16 pm

Yeah engine and ecu came out of a bb4 and mines a bb3. I'm lost now because I can't get rid of codes 20 and 22 even tho iv wired 22 up. But no codes show when I put my original ecu back on.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Mon Mar 07, 2016 11:55 pm

The original ecu won't be looking for a vtec oil pressure sensor, so that's why that code wouldn't show, for a start.

Have you done the checks I suggested?

Post by **Merlin** » Fri Mar 11, 2016 12:37 pm

There are two types of VTEC solenoid, ones that have an oil pressure sensor and those that do not. All 4th gen VTEC's use a a VTEC solenoid with an oil pressure sensor, what type do you have?

Merlin wrote:Here are some pic I have taken of my VTEC solenoids:

H22a with a snapped pressure sensor I need to replace

H22a2

H22a7

H22a8 which does not have the the same sensor but does have a blanking bolt.

http://www.ludegeneration.co.uk/honda-p ... 36-20.html

Merlin wrote: Oil pressure sensor?

H22a 4th gen - yes
H22a2 - yes
H22a5 - no
H22a7 - yes
H22a8 - no
H22a Type-S - no

http://www.ludegeneration.co.uk/post275573.html