BCoon

I have two options here.. replace mine w/ an AM600 from a junkyard for about $120, or get a new 2001 kind for about $80.

Do I need to have the ECM reprogrammed (not reset) from the dealer for both/one/neither of these? I'm getting hesitation in the 6MT 2002 (there is a TSB). But, I can deal with that if I have to. If these need a reprogram, I will do it of course..

NmexMAX

iTrader: (22)

You may or may not. You will fond out when you change the sensor. Wait on the TSB until after you have replaced the MAF, then get both done at the same time.

BCoon

How would I know?

I was planning on getting the ECM reprogrammed for the hesitation eventually, but in the TSB it says that specific situation requires a special reprogram, not the normal method. I have no idea why.

I guess now I just need to decide if I want a used AM600 or a new one from a 2k/2k1 and transfer the IAT..

Any input on that?

NisTech

the bulletin says you have to reprogram after on some models. I usually do however 2 other techs never reprogram after and they never had a single car come back.
Don't ask me why, but you may get away with it

BCoon

Not meaning to be rude, but aren't you supposed to know the answer to that?

machinehead131

iTrader: (1)

I just threw one in from an 01 that i got from the nissan dealership. Mine shat out on me and i replaced the little resistor or whatever it is and all is well.

NmexMAX

iTrader: (22)

You will know after you change the sensor because the car will not run right, hence why I said wait until you change the IAT/MAF and see how it runs.

nismo_star

iTrader: (8)

runs ok w/o the update for the 2Y000 MAF, but please read all below.

may still get P0171 Fuel system lean or P0100 MAF which will need ECM update.

I say this cause it depends on if the vehicle has gone in for a P0420 update program which is very very common. (Nissan had 4 updates in the last 7 years, not including countermeasure 2Y000 MAFs)

-

Lontar1

iTrader: (5)

no need to reset the ECU.....

BCoon

Thanks for the responses guys. I am planning on getting the latest ECM update sometime, I just didn't know if it would be necessary due to a MAFS replacement.

I guess I'll see!

NisTech

how could i know it? I guess the car ran fine... and a/f mixture % was within spec. so i guess they cut that corner.

PlanoSER

I have an early model 2002 6MT. With the 01 MAF on there, I get the SES code for missing IAT.

However, when I soldered the resister on, it got rid of the IAT code, but now gets a code for P0300 multiple misfire.

I picked up an '03 MAF and the same thing, the car throws the P0300 code, and misfires randomly.

I find it weird that when I put the '01 MAF back on the car and remove the resistor, cleared the codes, it got the IAT code and that's it, the misfire code went away.

Could this have anything to do w/ my ECU needing a reflash ??

NisTech

if you run too lean, 25 % or more it will throw a multiple cylinder missfire code.

Also that code pops up if you have a lazy coil and eventually if you drive long enough it may or may not give you cylinder nr.

PlanoSER

Does it do the same for running too rich? I have been trying to figure out the cause of my misfires. Yesterday I started the car in the morning, let it idle for ~10 seconds then hit the road driving normally shifting at 2-3kRPMs. It was hesitating very badly, I reset the MPG calculator on the comp, and barely pressing the gas pedal in 4th gear about 2200RPMS, it was averaging VERY poor milage of 13mpg. I rolled down my window and could smell the fuel.

Now, to get the car to stop misfiring, I flogged it -- downshifted to 2nd, ran it to redline, and ran it halfway through third. When I initially floored the gas pedal, it continued to hesitate for about 2-3 seconds, then it "let go" and gave me 100% surge of power as I ran it up to redline. After I was done flogging the car, I steadied out and drove 'normal' again, and it did not misfire anymore on that trip. I reset the MPG calculator and was averaging a good 24mpg now on the reading.

Any correlation to running overtly rich to misfire, and anybody have a clue on what could be the cause?

Thanks for your help

nsnrider

iTrader: (59)

are you getting any othe codes besides the p0300? how many miles on your car? have you replaced your coil packs? any major maintanance recently? Why did you put in the 2001 maf in there in the first place or was it the original maf in the car?

PlanoSER

The original MAF blew and I put the '01 MAF on there and did resistor trick. I tried an AM600 MAF (2003) also but it runs the same -- actually seems to run slightly worse with the AM600. I put the '01 MAF back in and thats what's currently in the car. P0300 is the only code i get(code comes regardless of which MAF is on the car). my car has 110k on it. I have replaced the coilpacks and plugs recently and that has not fixed it. It makes me wonder if my ECU needs to be flashed for use w/ these MAFs.. i have an earlier production '02 -- 6MT.

NmexMAX

iTrader: (22)

That be my next guess.

PlanoSER

Any idea what the dealer would charge on that? I hate going to the dealer, so very much. The service ppl are such A-holes (I know not ALL of them are, but the ones i've dealt with so far...)

NmexMAX

iTrader: (22)

Depends on the dealer. Most seem to charge about an hour of labor, even though it shouldn't take that long.

sunstream453

sorry to bump this old azz thread, but it seems to hold the answer to my p0300 code ive been getting since i installed the 01 MAF with the resistor transplant. so if ive never gotten the update and this is my first replaced MAF, should I get that to help out? ive been missing a bunch of top-end power and would like to get it back. is this just an update that i can go ask for? i just ask for the 2y000 update or what?

NmexMAX

iTrader: (22)

I think there is a hesitation associated with a 'non' upgraded ECU. Have you verified that you have a power loss, or just butt dynoing?

I would get it done, I suppose it couldn't hurt.

sunstream453

well, i pulled one of my best 60's ever and still ran 4 tenths slower than my old PB, which was before my TS ECU upgrade. also trapped about 3-4 MPH lower than what I consistently run. and i was short shifting 3rd because the accel was painfully slow up top. to the point where it was really really noticeable. normally i shift 4th with a while to the line. this time i felt like if i kept in 3rd i wouldnt need to shift to 4th

zero2sixtyZ

iTrader: (30)

Plano, I have the same symptoms. I have a P0300 code and I cannot seem to get rid of it. I updated my ECU to the latest update via the dealership after I installed my AM600. I'm still in search.