360 Check Engine Light ... ECU Code P1200. What is this? - Ferrari Life
 
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post #1 of 9 Old 08-03-2014, 04:38 PM Thread Starter
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Check Engine Light ... ECU Code P1200. What is this?

Hello All,

I have a 2004 360 Modena. I got a Check Engine Light today after starting the car. Checked ECU code with my OBD2 tester and indicates a P1200. Checked what that means and I find this reference ...

P1200 Ambient Pressure Adaption (Bank 2) Attitude Factor too High (Max)

I erased the code and it came back, only when starting the engine. Cleared the code again but recurs after say a 45 minute rest between restarting engine.

Appreciate any insight into what the problem might be.

Thanks,
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post #2 of 9 Old 08-03-2014, 06:46 PM
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Steve- It says Bank 2 is having trouble with altitude compensation for air pressure at altitude. P1200 is the one that says it thinks atmospheric pressure is higher than it actually is, P1199 is lower. There is a similar set of codes for Bank 1. Could result in a lean or rich mixture. Will let one of the pros speak on that.

Most cars now are altitude compensating, unlike the olden days when there were differences in cars for low altitude locations and places like Albuquerque and Denver where the elevation is over 5000'.

I am not sure which sensor provides that altitude sensing and compenstion, but if it persists, you might have someone slap an SD2 on her and see what they can diagnose.

Taz
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post #3 of 9 Old 08-03-2014, 10:07 PM Thread Starter
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I turned the battery switch off and going to do a reset tomorrow morning following the documented Ferrari procedure and see if that clears things up.

I assumed it was something with air / fuel and was wondering if it was the O2 sensor or MAF. But I think those devices have their own dedicated ECU codes.

Regards,
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post #4 of 9 Old 08-03-2014, 10:49 PM
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Steve- Here is a simplified procedure that works for 5.2 and later Motronic Ferraris. Gleaned from several WSMs. Got tired of typing it so turned it into a word document.

Run cycle.

Turn battery disconnect switch off and turn off all accessories (stereo, A/C, etc).
Let engine get completely cold or wait at least 30 minutes.
Insert key in ignition and leave for 30 seconds.
Turn ignition to on and leave for 30 seconds.
Turn ignition off and leave for 30 seconds.
Turn ignition on, wait for Check OK, and start.
Let idle with no input whatsoever for 10 minutes.
Turn accessories back on and drive gently for 10-15 minutes at least.
You will have to insert stereo code, if required.

Taz
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Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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post #5 of 9 Old 08-03-2014, 11:52 PM
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Hi Steve, the atmospheric pressure sensor is located in the MAF. To confirm this sensor is the issue, try to swap them and check if you have the DTC on Bank 1
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post #6 of 9 Old 08-04-2014, 06:40 AM Thread Starter
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Thanks, guys. If code comes back I will swap the MAF devices and see if the problem follows over to bank 1. Will let you know.
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post #7 of 9 Old 08-04-2014, 09:21 AM Thread Starter
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Well, this is turning into fun. Not.

Yesterday got P1200 code. I turned the battery off and performed the adaptive reset procedure this morning. Everything going fine and finished reset procedure. Then driving back, got CEL. Pulled over and using my OBD2 reader read the code ... P1123. Cleared it. Restarted engine and got P1125 code. Cleared that. Drove home.

P1123 ... Long Term Fuel Trim Additive Air ... Document gives several things to check such as Check HC CO emision with no lambda integrator, check exhaust system leak, etc.

P1125 ... Long Term Fuel Trim Additive Air (Bank2) .. same things to check.

So, at least the error is still on Bank 2 (or so it seems). I read another thread here about P1123 and P1125 and the OP went thru a lot of gyrations before fixing the codes by replacing the MAF's

I am going to try to swap the MAF side to side and see it that reveals anything. Also, with respect the MAFs, I believe that the 360 MAF is same as used on Honda, Range Rover and Cadillac. Bosch Part Number 0 280 218 012 ... cost less than $100 versus Ferrari for ~ $500.

Regards,

Last edited by bisel; 08-04-2014 at 09:30 AM.
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post #8 of 9 Old 08-05-2014, 05:02 PM Thread Starter
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Swapped the MAFs. Also, did a quick cleaning of the electrical plugs. That, plus the mere act of disconnecting and reconnecting the plugs may have been beneficial in that it should give a better electrical connection. I had heard that the MAFs are pretty sensitive to electrical variations.

Two days and counting and no CELs.

Keeping fingers crossed.
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post #9 of 9 Old 08-05-2014, 10:06 PM
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Steve- I love a happy ending.

Taz
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Past: Dino 246 GT 02984, 365 GTB/4 14009, 308 GTS 25125

Every day I look around, and if nobody is shooting at me, it is a pretty good day.
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