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Old 05-05-2009, 04:28 PM   #1
Eatoniashoprat
Scooby Newbie
 
Member#: 143416
Join Date: Mar 2007
Chapter/Region: W. Canada
Location: Saskatoon
Vehicle:
1971 Super Beetle
EJ20g Platinum Grey

Default EJ22 ECU what years

Hi, I have a EJ22 from a 1998 impreza outback sport engine in my 1969 vw bus. I've driven it for 55000km with no major problems. I'm having some issues now and I'm 99% sure the ecu is pooched. When I follow the diagnostic steps in the subaru manual I always get to step "replace ecu". UNLESS the IAC and TPS just aren't set correctly.

Anyway, the ECU says 'O4' on it, does anyone know what year/model car this ecu came in so I can find one and try it?



SYMPTOMS & DIAGNOSES, for those interested

For the record I have a VSS 'simulator' hooked up, basically a 555 timer circuit telling the ecu I'm cruising all the time so I don't get the rev limit at 3500 rpm.

Sometimes when starting (warm or cold) and when the rpms fall (come to stop) the engine goes into a wierd mode where it sounds like its running on 2 or 3 cylinders, a simple off/on with the key clears it up. Also when going down the highway, the engine dies at a certain interval depending on how fast you're going, 60 mph about every 10 minutes, 70 mph, about every ~6, etc. but, to get it going again all you have to do is completely let your foot off the gas and then get back on it again. If you just back off a bit it stays dead but going all the way off gets it going again. I suspect it may be a problem with the VSS since sometimes it idles very low (as if it was getting to VSS signal) and sometimes it idles at a reasonable rpm.

I just had the motor apart doing head gaskets and timing belt so no vacuum leaks, IAC is clean, I've tried other TPS's and MAFs. I get code P1507. Things I haven't tired yet are going through every wire from sensor to ECU to ensure no breaks.

Mike
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Old 05-05-2009, 10:12 PM   #2
GriffithBuilt
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Member#: 141927
Join Date: Feb 2007
Default

A straightforward way to test the TPS is to use 'T-Pins' which you can get at a local fabric store. You can poke the T-pin between the wire and the seal on the plug for the tps and probe it for voltage at closed, open and then sweep it to make sure it isn't intermittant.

Also to consider, you may want to call the guys at SmallCar up in Tacoma, they do the vanagon conversions (not sure about your '69, is it a wedge or a bay?), and they sell a reluctor wheel that attaches to the CV shaft flange which will give wheel speed to your EJ22 ecu, that may be causing the fluttering as you come to a stop, as it is not seeing the speed of the vehicle still remaining the same as you put the clutch in prior to a stop. This will require that you wire in the wheel speed sensor into the ECU also. That will only effect your 'coming to a stop' symptom though, I would guess.

I would suspect the 'fooler' VSS circuit more than anything, there's not much in the IAC that would cause the ECU to flag a code I would guess. TPS's on the other hand are contact sensors, so they wear out. Not sure if the Haynes or factory manuals have the expected voltage at closed/open throttle, but that's the first place I'd look. I had very similar intermittant nightmares all over the powerband on a vehicle whose TPS had bit the dust.

Jason
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Old 05-06-2009, 09:00 AM   #3
Eatoniashoprat
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Member#: 143416
Join Date: Mar 2007
Chapter/Region: W. Canada
Location: Saskatoon
Vehicle:
1971 Super Beetle
EJ20g Platinum Grey

Default

Thanks for the reply. I've actually tested the TPS and have triend another one in its place.

The VSS circuit worked for quite some time (no wierd symptoms). I have a couple good hall effect sensors that I can fab a bracket and make it read off the CV. It would be something to try, although it goes into this wierd mode (sounds like 2-3 cylinders, really rough) right after start up sometimes, and I don't know how the VSS would make this happen. I'm also perplexed by the dying on the highway, its a timed interval, what in the ecu is based on time? After so many revolutions, so if I'm going faster the intervals are shorter?
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