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GDI Engines: A Few Words

GDI Engines: A Few Words 1

GDI Engines: A Few Words

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On some 6 G -74 GDI engines, a throttle corrective control circuit is used, which consists of:

  • Throttle Posicion Sensor, located on the axis of the throttle
  • Two Acceleration Pedal Posicion sensors located in the area of ​​the left front pillar and controlled by a throttle cable.
  • Throttle Control Motor, located on the throttle opposite the TPS, which controls the throttle
  • THW (temperature sensor) located in the “collapse” of the cylinder block

The throttle is set to the “correct” position when starting the engine when the ignition key is turned to the “Ig 1” position. A completely closed throttle valve opens sharply by 20-30 degrees, and then slowly “goes” back and stops in the position that two sensors “point” to it – TPS and THW (when adjusting the TPS with the ignition on, the throttle valve changes its position. Also, when the resistance THW changes, the throttle valve changes its initial position). When the ignition is switched off, the control unit (ECM) monitors the performance of the throttle valve:

  • Throttle Control Motor “throws” the throttle all the way up and back, all the way down. This ensures that the throttle is ready for the next engine start and that the throttle control system is working properly..

In case of incorrect TPS adjustment or incorrect operation of the Throttle Control Motor, when the throttle valve “passes critical installation angles”, the ECM starts to “swear” and completely disables the throttle control system. To restore performance, turn off the ignition and wait 20-30 seconds until the automatic reset of incorrect information occurs (click the relay behind the “glove compartment”).

Some MMC cars with GDI engines have problems not directly related to this type of injection system..
For example, Thomas Essemann described MMS issues with a throttle position sensor:
“. I also know that almost every Space Runner in Europe has had the TPS-trouble code problem. This is because the there is two channels in the TPS, cross-referencing with each other. Metal / carbon material from the sensor is deteriorating and causing signal-trouble, spreading in the TPS-housing. Because of this, it is recommended that you do a two-step-repair.
1) Change the TPS (old part nr. MD 628 071) with new (part nr. MD 628 204). Erase all codes and run vehicle for some days.
2) If this didn`t help, change throttle housing (old part nr. MD 355 334) with new (part nr. MD 514 334). This should take care of the problem. At the same time, you would get rid of code. since these codes come from the same failure. From production Sept. -’99 Mitsubishi have made some changes in the trouble code sensing software, to prevent TPS from this very sensitive behavior, but you should not need to have this new software since the new TPS is of a better design than the old one. As for the acc. pos. sensor, you might have to do a proper adjustment. Procedure is from a Mitsubishi Carisma GDI, but I assume that they use the same procedure. ”
In addition, a sufficiently large number of primary sources indicate an increased sensitivity of the high-pressure pump to an increased content of sulfur in the fuel.
A small description of the direct supply system for gasoline cylinders (on the website of Vladimir Leshchenko, Odessa).


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