My 2012 5.0 s/c throws random P0236 errors. I posted about this before, researched previous threads, elsewhere on the Internet, and can't see to sort it. At the direction of the code, I have replaced the front MAP sensor. The air intake is new. I replaced the air filters with a 2 pack of OEM. They were carefully installed, and everything closely scrutinized for leaks. The only Vacuum lines I see are the breather tube that run to the drivers side of the air intake tube, the breather tube that runs to the port just above the throttle body, and both lines running to the waste gate servo, All lines are good, tight, and in place. In my Foxwell handheld, equipped with JLR software, I can see boost vary from 5 or so PSI at idle to 20 or 21 at WOT under load. The car RUNS great. In the software, however, the measure airflow is probably 15 percent or lower on the Drivers side than the passenger side. My thought was maybe one of the MAFs was failing. I swapped the two, and the Driver's side still reruns lower. This tells me it is not likely an issue with the MAFs. Thought it has been written that it is imperative to have matched filters, do the two sides still flow different rates? What effect does there being a breather in the intake tract of the driver's side, but not the passenger side have? I am trying to be methodical, but do not know what I am missing. Any thoughts from any who have seen this before? I appreciate it.

John

 

This may be your issue. The code that is being thrown is for the TMAP sensor which is located in the rear of supercharger housing. This reads the pressure after the air is pressurized. The one you replaced is before the pre-pressure air reading.

P0236-00 Turbocharger/Supercharger Boost Sensor A Circuit Range/Performance - No sub type information NOTE:- Circuit TMAP_PRESS_SENSOR - Description: Sensor-Manifold Absolute Pressure-and Temperature(MAPT) - PV8SC CONNECTOR HOUSING NOT SERVICEABLE Location: Rear LH side of engine

• Blocked air cleaner element(s)
• Intake manifold air leak
• Manifold absolute pressure sensor 2 circuit short circuit to ground, short circuit to power, open circuit, high resistance
• Engine breather leak
• Carbon build up on throttle plate
• Exhaust system blocked
• Manifold absolute pressure sensor 2 failure
• BARO sensor failure

• Check air cleaner element is free from restriction
• Check for leak from air intake system, rectify as required
• Refer to the electrical circuit diagrams and check manifold absolute pressure sensor 2 circuit for short circuit to ground, short circuit to power, open circuit, high resistance
• Ensure the engine breather system is correctly installed and in serviceable condition
• Make sure throttle blade is clean of carbon
• Check for blocked exhaust
• Check for related BARO sensor DTC P0069-29
• Check and install a new manifold absolute pressure sensor 2 as required. Refer to the warranty policy and procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component
• 
  

 

Thanks for the response. I thought the "A" referred to the front MAP, so I replaced that one. I see it listed as the LH rear side of the engine, but do not see it listed in the parts diagram. Any idea WHERE it is listed? I will pop the hood when I get home.

Thanks,

 

Oh Lord, that one is in a bad spot. I'm not sure you can replace it without removing the intake manifolds. Not sure if its the same for the pre-2014 cars, but my sensor was a Volvo # 261 230 296.

Isn't there another little sensor on the top middle section of the intake manifold lid?

 

Yes there is, but thats for charge air temperature. The rear sensor -

The Manifold Absolute Pressure and Temperature (MAPT) sensor allows the ECM to calculate the air charge density immediately before it enters the cylinders. This is used to adjust the ignition timing relative to the boost pressure, and to monitor the performance of the charge air coolers.

Front sensor -

The manifold absolute pressure (MAP) sensor allows the ECM to calculate the load on the engine, which is used in the calculation of fuel injection time.

 

I see where it is, and that it is in a horrible place to replace. Though I am pretty experienced in reading parts schematics, I cannot find it in the various Jaguar OEM diagrams. Does anyone know which section it is listed in, or a part number I could search by? Has anybody done one of these in the car, and if so, so you have ant tips or tricks?

I appreciate it.

 

Get yourself a copy of the AJ133 Technical Training pdf from my Dropbox here: https://www.dropbox.com/s/8y4iax9hm2...%20V8.pdf?dl=0
Then go to page 90 to see the location of the TMAP sensor - left rear of the supercharger.
I'm guessing it's a PITA to get at and you may need to remove some/most of the "symposer" to do so.
Also see page 102.
Edit 2 - this one from Rock Auto, although it is listed under MAP sensor (no listing for TMAP sensor), looks identical to the pic on page 102 of the pdf so it might just be the correct part: https://www.rockauto.com/en/moreinfo...=11207&jsn=843
Edit 3 - yep, looks to be right, when I put the cross reference part number AJ811668 into Britcar I get this listing: https://www.brit-car.co.uk/product.p...___f_pace___xe