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slimecity
P Plater
20 Posts
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 Posted - 31 Oct 2010 : 11:27:55 AM
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Hi there - i want to run this procedure past pple to ensure i have gotten it rite - have a code 44 - engine running rich and am testing sensors one by one - TPR and MAT and CTS all appear OK.
Firstly to test MAP - meter shld be set on DC not AC? IF DC, then my readings appear to be OK.
Firstly I left the MAP connected to loom and put pins thru the wires running to conenctors A, B and C. With engine off but igntion on - i got 5VDC between pins A and C. Also got 5VDC between pins A&B.
With hot idle engine i got 5VDC between pins A&C, and 1.1VDC between pins A&B - does this look like the MAP sensor is funtional?
Characteristics of fault to me indicate a vaccuum/MAP issue - engine lite on mostly wen engine idles - then goes off when you give the car some power - ie: a low vaccuum sitn. I have checked all vacuum lines meticulously and the reservior tank is holding vacuum. Any other ideas? much appreaciated!!
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Simon |
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Mechknight73
National Driver
1001 Posts
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Posted - 31 Oct 2010 : 2:22:02 PM
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Here's a few more places an engine could leak vacuum from (sorry I didn't think of it earlier)
- Manifold gaskets. even a small leak can screw with it, and not show up as an engine running rough (last resort to mess with replacing that one)
-Any vacuum servo valve. This can be from the heater vent controls, such as the little servo valve linked into the plumbing near the header tank. If you sit in the cab, with the doors shut, and the engine idling, you may be able to hear it as a faint hissing sound. The main vent control on the dash is controlled by vacuum, rather than mechanical or electric servos
According to the manual, 5 volts is exactly what the MAP sensor should read. It would also be tested in DC current, AC only applies to house wiring ad a few other specialised applications. Computers of any kind always run DC.
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Edited by - Mechknight73 on 31 Oct 2010 2:23:24 PM |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 31 Oct 2010 : 4:50:58 PM
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By putting pins through the wires do you mean you pierced the insulation??
Just for future reference this is not a good thing to do as you open up the wiring to corrosion and may give you all sorts of drama's down the track. Best practice when testing any sort of wiring is to back probe the plugs. is where you make contact from the back side of the plug.
You can get what you call "testing spoons" which are made for this job. Alternatively if your probes will not fit in the rear of the plug grab your self a piece of scrap wiring and rip a couple of strands of copper out. Wrap a copper strand of wire around each of your probes with a tail sticking out( the piece you actually probe with) and you should be good to go.
If you have poked a hole in your insulation grab yourself some silastic (or similar) put a little bit into each of the punctures and tape them up with some electrical tape.
Cheers |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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slimecity
P Plater
20 Posts
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Posted - 02 Nov 2010 : 3:01:39 PM
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Yep, I am a doofus. piercing the insulation seemed like a gud idea at the time......
Really appreaciate the info guys.
I'm now curious about the CPU - is there any diff between the CPU/memcal that was installed in the Aus vs NZ 1989 Commys?
I'm asking as this may be the problem - the mechanic originally replaced the entire CPU and I'm worried he may have dropped in an "Aus" CPU which is now looking for a non-existant O2 sensor reading - hence coming up with an error code in my NZ commy which has no frickin O2 sensor.
Is this likely to be an issue?
Cheers! |
Simon |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 03 Nov 2010 : 9:38:12 PM
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| Memcals for New Zealand should be - ARHS6587, ATPW???? (question marks being numbers) BABU3587, BAXY???? or BAXZ????. This should cover the memcals upto the end of VP. The ecu right through the VN/VP range is the same for V6 and V8. |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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slimecity
P Plater
20 Posts
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Posted - 14 Nov 2010 : 10:52:53 AM
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| OK, this is where it gets weird. The CEL started lighing up a while ago, and the car also died at completely random times. Took the car to the mechanic who ingeniously replaced the entire CPU as a "Fix". A bit later I doublechecked the coil pack and replaced it - this fixed the stalling problem - but the CEL was still showing. I then learned how to read the codes from the CPU - Code 44, I've since heard this code isnt available on NZ VN Memcals. Just checked the memcal number further to advice on this forum - the CPU is one from a 3.8 V6 VP - I understand thats OK, the label on the outside of the CPU is marked "BAAM", the Memcal number (on the silver sticker) is BAAM-0265. This is the wrong memcal for my VN V6 3.8 series 1 NZ manual? If so, should i try to get the original memcal back from the mechanic, or is now a gud time to upgrade to a better memcal? If so, how do I do this and at wot cost? Cheers for ur help!!!! |
Simon |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 14 Nov 2010 : 1:39:31 PM
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Here are the specs for your memcal -
BAAM0265 - 92, 3.8L V6 Auto - For 92 mdl VP V6 Engine changes
I would go and see if he still has the memcal from the old ecm and see if it is a NZ number put it in, clear the codes and see if it works.
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What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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Mr Persistant
P Plater
72 Posts
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Posted - 14 Nov 2010 : 1:51:23 PM
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I'm no expert on memcals and ECU stuff, but if you know you have the wrong memcal which is designed to run with an O2 sensor - and you run no O2 sensors in NZ - & you are getting a code 44 (running rich)...then that is not very surprising is it? Seems logical.
Who knows what that memcal/ECU will do, exactly, in the absence of any O2 signal input? I would try and get the original memcal/ECU back. Was it an exchange unit? ie, why did you not get your original one back?
I assume, also, you clearing your codes between trying stuff out?
I am not an authority on this, but vacuum leaks seem less critical on injected cars of this era onwards. Sure,a vacuum leak will not help idle smoothness, , but ultimately it's just a bit more air getting into the intake, which the MAP will adjust mixture for...and the IAC will close a little to keep idle speed down to the normal level.
If you think the ignition module is close to 200K kms old, I would replace that also - save yourself a heap of aggravation. And ditto on the CAS. Short of complete loss of spark, their problems seem to manifest noticably at idle first.
Between those two (+ your new coilpack), good leads and plugs, the coolant/engine temp sensor (NOT the gauge sender)..I pretty much haven't touched anything else & mine runs smooth and hard, all the time, every time. It's not a lot of money or labourfor good result.
I also removed/replaced all engine sensor connections several times to 'scratch-up' the connections before packng dielectric gel in there and re-connecting finally, to ensure good, corrosion free conductivity at connectors themselves...stopped my pinging @ WOT. I have not really looked at TPS adjustment or anything else fancy like that. I'm not telling you what to do, just mentioning if you cover all the basics, sometimes you don't need to do anything else. |
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slimecity
P Plater
20 Posts
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Posted - 23 Nov 2010 : 06:44:25 AM
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I'd like to thank everyone for their help with this - it turned out that you guys were onto it - the memcal was clearly for a 1992 VP V6 manual - but Ozzy spec - I went back to the mechanic (after trying to explain to him what the problem was, and having him look at me like I was a nutter) and dropped my original (1989 VN V6 NZ Spec) memcal back into the car computer (lucky he had the original CPU & Memcal still lying around). I reset everything and took the car for a spin: no CEL. Then did a code test and got Code 12!!! Awesome! The lesson here is for fcks sake check your own codes using the procedure on this site - dont trust anyone else to butcher your car when they dont know/care what they are doing......
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Simon |
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