2017 Jaguar XE 2.0 Turbo - MAF & IAT error code

A friend of mine had this car at his shop and was trying to repaired it. He has changed pcm, and even changed MAF sensor but still problem exist...

Car won’t throw error code until you hold the accelerator down for some times before you get error codes talking about Maf and iat..

Intake air leakages were checked and all seems fine.

Need some help on this,

The 5 volt reference comes when car start and accelerator pedal depressed... attached file contains images of the fault codes and the wiring diagram..

The car stalled when the sensor is plugged but when it is unplugged car won’t stall...

I have helped him to look for leakage but no leakage, I need help

Back probe maf and iat wires at pcm and write down readings then do the same at maf and iat sensor. After that unplug sensor and check readings again. Then ohm each wire with battery disconnected pcm disconnected and sensor disconnected. they should read zero. If everything checks out then check wire insulation going to pcm for bare spots ahorting to another wire. And check grounds for sensor and pcm. Problem should be in wiring otherwise it may be internal to pcm.

The blue wire looks to be the one that could affect both IAT and MAF, and appears to be a sensor ground. I'd 'scope it at the MAF and see if it's getting driven high.

With engine off, key on..

Pin 4 at Sensor side reads 12 volts but when car starts it goes on to battery volts, this test was done without Connecting the harness to the sensor, the pin 2 maintains it Ground/earth ( whether car start or not) , pin 1 also gives 5 volts reference as well as PIN number 3 also gives it close reading to 5 .

I will be posting further more test as prescribed

The blue wire is contain ground which is there when car starts or not, the ground does not disappear, even when connected

Looks like a wiring harness or connector issue to me. Also was the MAF genuine or known good ? ---- lots of fakes around

Response to-: Andy.MacFadyen

Sensor connector is fine, and if even it is not I had it changed yet stil, bare in mind that the fault does not appear, when you turn the ignition on for more than several minutes, not when you start the car immediately and guarding the idle nature of the car by raising the accelerator a little, so that the car won’t stall, but rather keeping the accelerator at a position for 3-5 minutes or sometimes more
Before the fault codes will show up.

But if you unplug the sensor and you turn the key on, the fault code come up immediately, likewise to other sensors when they re unplug,

So this certified that it is not lose connection , because when sensor was plug and key turn on , no fault codes immediately until car is started and your raise the accelerator in other not to shut it down... for couple of minutes before error codes come up..

Am yet to display other checks requested by other members

Hi everyone,

Taking a review of Paul's book, there was a case which a Map performance code was set because TPS was out of range.

The tricky part of that was no mitchell neither other database but snapon scanner, gave him a clue on how the code was set (tps out of range).

forumoto wrote: for couple of minutes before error codes come up..

Do all four codes set when this happens?

guafa wrote: Hi everyone,

Taking a review of Paul's book, there was a case which a Map performance code was set because TPS was out of range.

The tricky part of that was no mitchell neither other database but snapon scanner, gave him a clue on how the code was set (tps out of range).

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You see if you don’t use the accelerator pedal to hold the gas able some certain height, the engine will stall or die when you start.

Matt T wrote:

forumoto wrote: for couple of minutes before error codes come up..

Do all four codes set when this happens?

Yes please the codes all appear... or sets in... reading the live data of the Maf and iat, you can see that they re not responding well, another car MAF sensor was tried yet still, original sensor was taken to the other, it’s perfect

In your first post. Do you mean 5volts change with throttle released?

What is your Map reading with Maf unplugged?

Can you post all PID's with and without Maf plugged?