MAP Sensor Problems

[Yanayaya]

I'm at the end of my tether with this thing right now. So at the weekend there I replaced the clutch and flywheel, everything was fine until I got back in the car and started it up. The EML went on and the Traction Control was off, I scanned the code with EFI Live and P0106-00 Manifold Absolute Pressure Sensor Circuit Range/Performance. So I went and had a look at the map sensor and due to it's location (on the back of my FAST intake) the probe part had snapped off in the hole. I bought a second hand map sensor online with the same part number and installed it.

The EML no longer goes on but the Trac Off message is still displayed and the car is over fuelling a touch (smells) and runs a little rough, like it has a small miss now and again. I can't find and pending codes, so I took to logging data but I can't find anything wrong.

|https://thumbsnap.com/27RYcaoR[/url]
Old MAP sensor that snapped.

|https://thumbsnap.com/q4TsQT3J[/url]
New MAP sensor that doesn't seem to have helped.

Was I wrong to assume that a MAP sensor with the same PN would work on the car? If anyone is interested in seeing my logged data I can upload it. As it stands I'm not sure what to do next, something is clearly not well, the message saying Trac Off illuminates if there is a sensor fault on start up I've been told. How the hell do I find out what sensor it is?

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Edited by Yanayaya on Wednesday 11th October 19:39

[vxkev]

Just a thought have you made sure all the electrical connections that were disturbed or disconnected are all back okay

[vxr2010]

is it worth a temporary repair on the broken one and connect it up it may point you in the right direction

[stevieturbo]

If it's the same part number then it will be correct.

But that doesnt mean it has fixed whatever fault there may be, you're just assuming the map sensor was at fault ? Have you tested it ?

[Yanayaya]

The original eml was the map sensor, that's all I know right now. The trac off is the remaining issue but unsure where to even start. Everything is plugged in. Is there a way to tell what sensor its reporting a fault with?

[stevieturbo]

Yanayaya said:

The original eml was the map sensor, that's all I know right now. The trac off is the remaining issue but unsure where to even start. Everything is plugged in. Is there a way to tell what sensor its reporting a fault with?

The code didnt say map sensor....but it pointed in the direction of the map sensor, that isnt quite the same thing.

If the MAP sensor was not clicked into the manifold correctly, that in itself could have skewed any signals enough to generate a fault. But it doesnt mean the sensor itself is faulty ( nor its wiring etc )

Whatever you're using to give codes is steering you in the direction to test, which is anything relating to the MAP sensor...but not necessarily 100% the MAP sensor and nothing else.

And the way to tell is to monitor or test and see if the readings are sensible when driving and/or when the fault actually shows itself.

[Yanayaya]

stevieturbo said:

The code didnt say map sensor....but it pointed in the direction of the map sensor, that isnt quite the same thing.

If the MAP sensor was not clicked into the manifold correctly, that in itself could have skewed any signals enough to generate a fault. But it doesnt mean the sensor itself is faulty ( nor its wiring etc )

Whatever you're using to give codes is steering you in the direction to test, which is anything relating to the MAP sensor...but not necessarily 100% the MAP sensor and nothing else.

And the way to tell is to monitor or test and see if the readings are sensible when driving and/or when the fault actually shows itself.

Hey stevie,

The map sensor was physically broken so that particular fault made sense as did replacing the sensor to fix it. Right enough the code didn't directly say the map sensor was borked it just said manifold pressure sensor range performance. Now that I have no EML on and I've logged the data I can see the map sensor replacment I bought is working fine and the values are where they should be. The Traction Control being off is what I am fighting with, I can't even get something to point me in the right direction as (right now) I don't know how/if my Efi Live will be able to report back on what the problem is. The logged data I have doesn't show any real problems but the car isn't happy. It's horrible not having any frame of reference to fault find.

[mfp4073]

I could be totally off the mark here, but I'm sure that the rear ABS sensors can play up if the air gap between the sensor and reluctor? Is not correct, or if the wiring has been disturbed. This will show up as a low traction fault etc, so it may be worth looking into.
Apologies in advance if this is a wild goose chase.

John

[stevieturbo]

mfp4073 said:

I could be totally off the mark here, but I'm sure that the rear ABS sensors can play up if the air gap between the sensor and reluctor? Is not correct, or if the wiring has been disturbed. This will show up as a low traction fault etc, so it may be worth looking into.
Apologies in advance if this is a wild goose chase.

John

Any ABS faults would certainly impact on TC, but then are there any ABS warning lights etc ?

And without a proper scanner, you wont be getting any fault codes or info out of the ABS etc.

[monkfish1]

Yanayaya said:

Hey stevie,

The map sensor was physically broken so that particular fault made sense as did replacing the sensor to fix it. Right enough the code didn't directly say the map sensor was borked it just said manifold pressure sensor range performance. Now that I have no EML on and I've logged the data I can see the map sensor replacment I bought is working fine and the values are where they should be. The Traction Control being off is what I am fighting with, I can't even get something to point me in the right direction as (right now) I don't know how/if my Efi Live will be able to report back on what the problem is. The logged data I have doesn't show any real problems but the car isn't happy. It's horrible not having any frame of reference to fault find.

Any other engine codes at all? Fuel trim errors?

If not, then you need to interogate the ABS to find out what is going on there.

[Yanayaya]

monkfish1 said:

Any other engine codes at all? Fuel trim errors?

If not, then you need to interogate the ABS to find out what is going on there.

No other codes, just this "trac off" message. I was told to run a full scan using EFI Live, which I have done but it doesn't mean anything to me tbh. I have also taken some data logging of my car using EFI Live, this logging was taken with the car sitting on my drive from cold. Both of these files can be found here: https://www.dropbox.com/sh/sxogpplso95pplz/AAB8LH_... in case anyone is interested or could potentially have a look.

[stevieturbo]

And as said, EFILive aint gona touch the ABS system

You need a proper scanner for that, not just an engine scan tool

[THUNDER STORM]

As you have done the clutch, maybe you have disturbed or damaged wiring in the area of where you were working.
Just have a good check in that area, as fault started after clutch job correct?

Ade

[Mud_]

LTFTs +8.6%, is this pegged high (I don't run these)? STFTs are around -6.5% on idle shown in log (ECT only ~50'C) which brings you back to around normal - so punt of vacuum leak once warmed up?

[Yanayaya]

Started to take the intake off as I’m going to move the map sensor to a safer place. I noticed my battery indicator is black (instead of green) , thinking about my trac off issue which has been known be triggered by I flat-ish battery I’m wondering if I may have found a possible culprit. The battery voltage was always good and I’ve never had any issues with it but, the indicator says it’s not happy either.

[THUNDER STORM]

Yanayaya said:

Started to take the intake off as I’m going to move the map sensor to a safer place. I noticed my battery indicator is black (instead of green) , thinking about my trac off issue which has been known be triggered by I flat-ish battery I’m wondering if I may have found a possible culprit. The battery voltage was always good and I’ve never had any issues with it but, the indicator says it’s not happy either.

I think you have found your problem.

Ade

[Yanayaya]

Just to finish this thread up, it was indeed voltage. Although the car didn't show the voltage as low and neither did a multimeter, I left the unit on my battery conditioner and it's green indicator light eventually came back, after that, the problem with TRAC OFF was gone.

[THUNDER STORM]

Yanayaya said:

Just to finish this thread up, it was indeed voltage. Although the car didn't show the voltage as low and neither did a multimeter, I left the unit on my battery conditioner and it's green indicator light eventually came back, after that, the problem with TRAC OFF was gone.

Now I am thinking is the alternator giving full charging, put multimeter on battery and check that voltage when car started and running. Are you getting around 14 volt charge, if not I would suspect alternator fault.

Ade