LandCruiser 200

MAF sensor clean
MAP sensor clean
MAP filter replacement

Step-by-Step

The V8 in the LandCruiser 200, as with all electronically controlled engines, requires accurate inputs from a variety of engine sensors.

Two of the most important are the MAF - Mass Air Flow- and MAP -Manifold Absolute Pressure- sensors. The MAF sensor is located on the airbox outlet and measures the amount of air entering the engine. The MAP sensor is located on the back of the intercooler and measures the intake air pressure after the turbos and intercooler.

Cleaning these sensors can help maintain optimal engine performance and economy, and potentially solve problems such as excessive exhaust smoke.

Ensuring the MAF and MAP sensors are providing accurate information

It's relatively easy to clean the MAF and MAP sensors, using a specialised cleaning spray. It's vital that you only use the correct cleaner. Using alternative solvents, such as degreasers, brake cleaner or carby cleaner will damage the sensors, leading to an expensive repair.

The most difficult part of the procedure is the removal of the intercooler, which is required to access the MAP sensor. To prevent sooting up, the MAP sensor on the 200 is protected by a small cartridge filter, which should also be replaced during the cleaning process.

While the intercooler is out, it's also worth cleaning the IAT -Intake Air Temperature- sensor, which is also located on the back of the intercooler.

How often?

The MAF sensor should really be cleaned every time the vehicle is serviced. The MAP sensor and filter doesn't need to be done so regularly. Clean and replace if you have any related fault codes, or as a step to solve power/economy issues. Personally, I'd cleaned the MAP and changed the filter twice in 180,000km.

IMPORTANT

The following should not be taken as instructions. It is simply a documenting of the procedure I followed for my own servicing and maintenance. No warranty is provided as to the accuracy of the information, and/or whether it applies in your situation or to your vehicle.

There are many additional checks which take place during routine vehicle servicing. It's not just a 'grease and oil change'. You may not be aware of these checks, which could lead to component failures. I strongly recommend you have your vehicle serviced regularly by a qualified mechanic. If you're not qualified and/or don't have the correct equipment, don't attempt to perform your own vehicle maintenance.

  • There are potentially lethal dangers resulting from the vehicle during the procedure.
  • There are potentially lethal dangers resulting from component failures which would ordinarily be checked during routine servicing.
  • There is the potential for expensive vehicle damage from improper servicing procedures.

If you undertake your own servicing, you do so entirely at your own risk.

Parts and Equipment required:

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LandCruiser 200 MAF, MAP and IAT sensor cleans and MAP filter replacement

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Step 1: Clean the MAF sensor

  • Unclip and disconnect the wiring from the MAF sensor;
  • Using a phillips-head screwdriver, carefully remove the two screws holding the MAF sensor, and remove the sensor;
  • Thoroughly spray the MAF sensor with MAF sensor cleaner;
  • Put the sensor aside and allow it to dry for 15-30 minutes;
  • Slip the sensor back into the airbox lid;
  • Refit the two screws;
  • Reattach the wiring harness, and clip it back into place.

Step 2: Remove the Intercooler

  • Remove the two nuts and lift off the plastic intercooler cover;
  • Remove the front two intercooler mounting nuts;
  • Remove the four nuts on the intercooler outlet flanges;
  • Loosen the two hose clamps on the inlet hoses;
  • Using a 10mm spanner, remove the rear intercooler cover mounting bracket, which will then give access to removing the remaining two 12mm mounting nuts located behind the intercooler;
  • You can then move the intercooler slightly towards the front of the vehicle;
  • Disconnect the MAP and temperature connectors, and the small vacuum hose between the MAP sensor and its filter;
  • With these disconnected, you can remove the intercooler from the vehicle.

Step 3: Clean the MAP and IAT sensors and replace the MAP filter cartridge

  • Disconnect the vacuum hose from the MAP sensor, and give the sensor and plug a good spray with MAF sensor cleaner.
  • Using a 22mm socket, remove the intake air temperature sensor and give it a clean with the MAF spray;
  • Allow the cleaner to evaporate from the sensors for about half an hour;
  • While the sensors are drying, move back to the vehicle and remove the old MAP sensor filter from its spring mount and disconnect the vacuum hose;
  • Install the new MAP filter into the bracket and reconnect the tube.

NOTE: If the vacuum hose is not reconnected properly (or split/damaged) the vehicle will suffer from severe loss of power, although no fault codes will be present. Reconnecting or replacing the hose will solve the problem.

Step 4: Refit the intercooler

  • Sit the intercooler just in front of its final location, then reconnect the vacuum hose between the sensor and the filter, followed by the black MAP sensor plug and the grey intake air temperature plug;
  • Move the intercooler back into its correct location, lining up the outlet flanges;
  • Slip the inlet pipes into the rubber hoses and tighten the hose clamps;.
  • Refit the four intercooler mounting nuts and the four nuts on the intercooler outlet flanges (Torque: 21Nm);
  • Refit the rear intercooler cover bracket using the 10mm ring spanner (Torque: 9Nm);
  • Refit the intercooler cover and tighten the two mounting nuts (Torque: 8Nm)

Step 5: Test Drive / Troubleshooting

Start the engine and take the vehicle for a test drive to ensure performance is correct and there are no fault codes or warning lights.

If there are engine trouble codes/warning lights:

  • Ensure all sensors are properly reconnected.
  • A fault with the MAF sensor can cause codes P0100, 0101, 0102, 0103.
  • A fault with the MAP sensor can cause codes P0105, 0106, 0107, 0108.
  • A fault with the IAT sensor can cause codes P0110, 0112, 0113.

If performance is poor but there are no fault codes/warning lights:

  • Check the small vacuum hose between the MAP sensor and filter. It is likely damaged or disconnected.

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