MAP sensor testing - Engine Code 44 - running rich.
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. I'm considering replacing the Fuel PR. Any other ideas? much appreaciated!!
The Grey Man
Engine Code 44 is oxygen sensor circuit (rich signal)
Illegitimi Non Carborundum
Hi there - cheers - the complication is that I'm in NZ - theres no O2 sensor on my 1989 VN V6 exhaust manifold - just the unconnected sensor wire. The VNs that came to NZ didnt have the O2 sensor connected to the CPU (i've researched this pretty thoroughly to double-chek this!)
To me this means I nd to run checks on pretty everything else as theres no O2 sensor - ie: vaccum, exhaust mani leaks, fuel press reg, etc etc,
The gregorys lists these as possible causes of code 44 setting.
Low fuel pressure.
Blocked injectors.
Contaminated fuel.
Exhaust leaks ahead of the oxygen sensor.(does not apply to you being in NZ).
Map sensor.
Blocked oxygen sensor vent to atmosphere.(does not apply to you).
If you are pretty sure it could be the MAP sensor causing it,then Id just get another second hand MAP sensor,(maybe borrow a mates) and try it to see how it goes then.It only takes a minute or two to swap them over.
An ECU for a NZ commodore must have been a different part number (to Aus cars), and had the O2 sensing capability switched off. Your rich code isn't possible, because you don't have O2 sensors to signal a rich condition. Is the ECU standard? Maybe an Aus style ECU has been fitted.
The only way I can think of fixing this problem would be to supply the ECU pin for the O2 sensor with a 450mV (0.45V) constant signal to fool the ECU into thinking that the sensor is reading at stoichiometric mixture all the time. Other than that, nothing you do will fix it.
Think about it... without an O2 sensor, how could the ECU possibly know it's running rich?
Standard ECU programming protocol is to ignore the O2 sensor signal when the engine is cold, or during high throttle angle - due to expected poor emissions. This explains why the light turns off sometimes.
Banned
could the code be linked to something else in NZ?
That's possible, hadn't thought of that.Originally Posted by soop
This code is pre-OBDII, so isn't internationally recognised. Having said that, you would think that Holden would have used the same software for their exports as they did for their domestic stuff.
oh, and 44 is indicating a lean burn condition (not rich), or low voltage (0 to 400mV) at the O2 sensor's corresponding ECU pin.
on holiday
make sure the o2 sensor wire is earthed under the dfi and coils it shouldnt really matter but its how they come and makes the ecu see 450mv all day everyday by rights there should be no o2 sensor error codes turned on unless its got an aussie memcal in it
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
cheers for ur help guys - yep i got it wrong - the 44 code is actually engine runnning LEAN so the CPU is delivering a rich mix.
The mechanics didnt have a fricking clue so they replaced the entire CPU at the outset after i got the CEL - I had a thought this could actually be causing the error if the CPU is an ozzie one not suited to the NZ model?
the sendor wire that usually connex to the O2 sensor is a light green wire adjacent to the exhaust mani that is not conencted to anything. Shld i do something with this wire?
Shld i also get another CPU? I got stung $300NZ for this one and will be really pissed if i didnt need it after all. The original problem was intermittent stalling - i repalced the coil pack and now it doesnt stall anymore - this was before i learned to extract the codes cos the mechanic couldnt do it. HELP??!!
on holiday
take the end offf the ecu held on with 2 little bolts and pop the memcal out and see what is on the sticker inside it on the chip
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
on holiday
o2 sensor wire is violet as well not green
I tune the oldschool way fear on the passengers face and knuckle colour cant go wrong
tabbacco is still my favorite vegetable
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