lilycrib32
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How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic demonstrates how to replace the G28 engine speed sensor This sensor is located at the top of the transmission above the flywheel ring gear It transmits a signal the ECU via an uncolored wire T5549 which is then sent to the tachometer located in the instrument cluster 1 Engine Speed Sensor The sensor is located at the edge of the transmission just above the flywheel ring gear the G28 Engine Speed Sensor sends signals to ECU pin T5549 using an uncolored wire The ECU then uses this information to control the boost fuel and timig It also sends an indication to the G5 tachometer inside the instrument cluster The sensor is used as a reference point to connect with the G40 Camshaft Position Sensor The ecu must be aware when the crankshaft is TDC and the location of the camshaft so it can start spark and injectors in the right way If this sensor fails the ECU will throw the P00160 error which means the Crank Shaft and Intake Camshaft arent in sync and possibly indicating chain stretch or a jumped link on the upper timing chain The code wont show without the additional information supplied by other sensors G4 or G40 It is a little tricky to test because there are several pins on the connector and each has its own functions The best way to do it is by measuring the resistance between the ECU and the sensor It should read around 1000 ohms when it is in full operation If youre experiencing issues with this component look for evidence of coolant or oil in the connector bay 2 Injectors Yesterday as i was accelerating off the highway paytoll at a high speed i noticed a huge drop in power It was like the engine had run out of gas Or my injectors were not firing In the morning i removed the spark plugs 3 were drenched in gazoline the fourth one was dry I placed a tissue over each hole in the injector and when I turn the engine on without sparks the 3 with gazoline jump out The 4th one stays closed I tried to test the ground connections of ECU pins 1430 and 4855 I found 0ohm I think the issue is somewhere else I also tried to reset PID but without success The car will start when the G28 is unplugged and it runs fine with the G28 plugged in However the intermittent misfire problem continues to occur at higher RPM The coolant sensor G62 even if it is not plugged in shows an ice temperature of 49c I also noticed that the oil gauge in the cockpit shows 2 bars when the actual pressure is zero Im not sure what to do but i feel i have pretty much ruled out everything else But im worried that I might have missed something If anyone has any ideas please share them TIA 3 Fuel Pump The fuel pump on the g28 is activated by a signal sent from the RPM sensor The GMstyle sensor is the same as the G4 and both are used in the 80 100 200 UrS and RS2 cars which is why you can easily locate one at a junkyard or in a local parts store Testing them is easy by putting your DMM in resistance mode and take measurements between pins 1 with the bump on the connector end up and 2 2nd from the left on the black connectors end They must be infinite ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY ADU engines requires to know both the position and speed the crankshaft to determine timing of fuel injectors etc It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this If you are experiencing issues with either of these the diagnostic scanner will display codes that could cause the engine shutting down A damaged G28 sensor can cause an inaccurate gearbox speed counter and a gearbox which shifts faster than normal andor an unfire when in the gear If you have any of these issues it is likely your sensor is deteriorating and should be replaced They are cheap and easytofind particularly when theyre a Bosch sensor like ours If you prefer GMs version of this part would be an option 5 Tachometer A failing engine sensor could cause a myriad of issues in your car It is an important part of the transmission of your Audi since it sends information to the ECU about how fast or slowly the cars engine is turning This sensor could cause the transmission to fail and other components of the car to be affected The G5 engine speed sensor is situated on the outside of the transmission above the flywheel ring gear and sends a signal to the ECU at pin T5549 via an uncolored wire The ECU utilizes this signal to regulate the amount of fuel and boost as well as timig It also transmits it to the G5 Tachometer in instrument cluster You can test the sensor for failure by examining the continuity between it and the tachometer between the ECU pin T5549 and the instrument cluster connection via pin T6a1 trace 79 and between T6a1 and the instrument cluster pin T26a12 There should be the resistance to be around 1000 ohms between these two points This is the same across the Audi 80100200RS2 series starting beginning with the 1985 MC and up to the 1997 UrS AN and the 1995 RS2 Du so you might find good ones in wrecking yards