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Old 01-22-2005, 20:50   #1 (permalink)
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EEC IV - help with the codes....

I've got a 6 cyl manual ED Falcon. I think it has the automatic ECU in it, though I was told this wasn't a problem.

I'm hoping someone can help me work thru some of these.

I ran the key off engine off ( KOEO ) test and got some interesting codes:
Hard faults:
- 15 Readout memory test failed. Does this mean that the ECU is actually buggered and needs to be replaced?
- 67 Park Neutral Position. I figure this doesn't matter with a manual, and may be from having an auto ECU.
Memory Codes:
- 22 MAP/BPR out of range. MAP/MAF buggered?
- 27 The only reference I saw to this was "Vehicle Speed Sensor in 2.3L Turbo". WTF??
- 36 Lean at idle (I think).
- 61 Engine Coolant Temp too low/grounded. Temp has been where it always has been.
- 63 Throttle Positioning Sensor too low
- 64 Intake Air temperature too low/grounded

I tried running the key off engine running ( KOER) test, but it wouldn't work. I did see a post elsewhere that said this happened when the computer couldn't control the idle properly. In one case, they had to replace the MAF.

The only thing that's been mucking up (mainly last week in hot weather) is that it's been idle hunting a bit when warm and stalled in the hot weather when letting off the gas. Ran fine under acceleration and no real loss of power. I'm actually a bit suspicious that the base idle is actually too low. I dunno if that actually may be related to the above memory codes.

Goddamit!! I can't believe it runs! But I can't work out where I would start with that list :(

Help!
ws
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Old 01-22-2005, 21:23   #2 (permalink)
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Re: EEC IV - help with the codes....

Some of the codes in that list are wrong, here is what I got:

15 - Unreliable ROM/KAM Data ???
67 - Trans NDS or A/C switched on - Probably from the trans conversion
22 - MAP sensor fault = ??Faulty MAP
27 - Gear lever position switch error - Prob from trans conversion
36 - Spedo signal error - May be from trans conversion but even still it should output the spedo sensor to the EEC, did you wire it correctly
61 - ECT voltage low - Was the engine hot for the test, it needs to be at running temp
63 - TP not high enough - Check TP voltage from memory needs to be around 0.8v-0.9v closed
64 - ACT voltage low - again may be if the engine was not warm
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Old 01-23-2005, 14:52   #3 (permalink)
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Re: EEC IV - help with the codes....

Quote:
Originally Posted by EDXR8
Some of the codes in that list are wrong, here is what I got:

15 - Unreliable ROM/KAM Data ???
67 - Trans NDS or A/C switched on - Probably from the trans conversion
22 - MAP sensor fault = ??Faulty MAP
27 - Gear lever position switch error - Prob from trans conversion
36 - Spedo signal error - May be from trans conversion but even still it should output the spedo sensor to the EEC, did you wire it correctly
61 - ECT voltage low - Was the engine hot for the test, it needs to be at running temp
63 - TP not high enough - Check TP voltage from memory needs to be around 0.8v-0.9v closed
64 - ACT voltage low - again may be if the engine was not warm
From what I can tell of the vehicle history, it was a manual from the factory, so I haven't done any wiring. I think I might go hunting VINs to see if I can work it out once and for all.

The engine was warm for the tests (done multiple times), and for those codes they were memory codes, which if I understand correctly, means they've happened somewhere in the past.

I did some hunting around the forums last night and it seems like it may not be possible to do the KOER test if that really is an auto computer as the car might think it's in gear. (The auto to manual thread). I'm going to give it another go with the clutch depressed when starting it. One post mentioned that if it was hooked up properly that might tell the engine it's in neutral/park and let the test run.

Thx for help/suggestions
ws
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Old 01-23-2005, 22:07   #4 (permalink)
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Re: EEC IV - help with the codes....

Got my hands on a Gregory's manual that says if you get an error code 67, that will prevent the KOER from being run :-/

Also seems like I've been told some porky pies by a dealer.

The ECU has a big 3DAC on it.
According to this thread, it is a 1993 standard (non XR) manual.

My ECU part number is :
93DA 12A650 AC
According to this thread it is consistent with a manual (ie AC). The auto is CC.

So, does it sound like my computer needs to be replaced ?? Any recommendations?

TIA
ws
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Old 01-24-2005, 22:18   #5 (permalink)
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Re: EEC IV - help with the codes....

Well, well, well. What an interesting day!

I pulled the ECU out to run some tests on it, and what's sitting underneath it? A Powerchip !! Must have been in there when I bought it. No-one ever mentioned it.

After removing that, and putting the ECU back in, I re-ran the KOEO test : 11 - System OK
I could also run the KOER test: System OK.

So, it seems the Powerchip was what was responsible for the 15 & 67 codes.

Now I'm back to what I originally wanted to do : trying to work out if I actually really have a problem with the stalling/idle hunting in hot weather. I've removed the Powerchip and will leave it out for 100Ks (to let the ECU relearn), and see what happens. Then I might put the Powerchip back in and experiment with higher octane petrol. They claim that some of their chips are really tuned to work with that.

Might do a couple of dyno runs in to see if the Powerchip *really* makes any difference at all.

Thx for the help
ws
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Old 02-23-2005, 00:08   #6 (permalink)
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Re: EEC IV - help with the codes....

Quick update.

So far, no stalling problems. I've driven in some nasty hot days as well. Everything seems OK. I had cleaned out the ISC. I don't think that was the problem, but may have helped some.

I'm running a tank of Vortex through it and taking it for a service. After that happens, I will experiment with the chip and Vortex. I have a suspicion that the chip may have required a higher octane than the regular 91 RON that was in it.

ws
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