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How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic shows how to replace the G28 engine speed sensor The sensor is located at the edge of transmission over the flywheel gear It transmits a signal the ECU via a grey wire T5549 then to the tachometer located in the instrument cluster 1 Engine Speed Sensor The grey wire is situated on the outside of the transmission just above the flywheel ring This sensor sends an electrical signal through the grey wire to pin T5549 The ECU then utilizes this information to regulate fuel timig and boost It also sends an indicator to the G5 Tachometer within the instrument cluster The sensor is used to link with the G40 Camshaft position Sensor The ecu needs to know when the crankshaft is TDC and where the camshaft is located so that it can start spark and injectors in the right way If this sensor fails when it fails the ECU will display a P00160 error code This means that the Crank Shaft is out of sync with the Intake Camshaft It could also indicate an issue with the chain or a jumpy chain link in the upper chain of timing The code wont appear without the additional information provided by other sensors G4 or G40 Testing is a bit tricky as there are two different connector pins and they have different functions but the most effective method of testing it is to measure the resistance between the sensor and the ECU When the sensor is operational it should be reading around 1000 ohms If youre having issues with this part check for evidence of coolant or oil in the connector bay 2 Injectors Yesterday when accelerating from highway paytoll at full speed I noticed a significant decrease in power It was like the engine had run out of gas Or my injectors werent firing In the morning i removed the spark plugs three were drenched with gazoline the fourth was dry When I crank the engine there are no sparks I put a piece of tissue on top of each injector hole and the 3 that were drenched in gazoline jump out but the 4th stays closed I checked the ground connection on ECU pins 14553055 and 4855 I get zero ohm Im assuming that the issue is somewhere else I also tried to reset PID without success mouse click the following web page will start when the G28 is disconnected but it is running fine with the G28 plugged in However the intermittent misfire issue continues to occur at higher RPM The coolant temperature sensor G62 shows the wrong temp value that is 49c even after unplugging it I also noticed that the oil pressure gauge in the cockpit is showing 2 bar whereas the actual pressure is 00 when I crank up the engine Im not sure what to do I think Ive ruled everything else out Im worried that i might have missed something Please let me know should you have any suggestions TIA 3 Fuel Pump The fuel pump in the g28 can be activated by a signal sent from the RPM sensor The GMstyle transmitter is similar to the G4 sender and both work on the 80100200 UrS and RS2 vehicles You can easily locate a spare in a wrecking shop or parts store It is easy to test them just put your DMM into resistance mode and test the distance between pins 1 and 2 with the bump on the connectors edge facing upwards They must be infinite Ohms 4 ECU Our 20vt turbo 3B AAN ABY and ADU engines have an ECU that has to know the position and speed of the crankshaft to make a decision about fuel injector timing etc It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this If you have a problem with either one of these the diagnostic scanner will show codes that could lead to the engine shutting down A malfunctioning G28 sensor can cause an inaccurate speed counter for the gearbox or a gearbox that shifts faster than normal andor an unfire when in gear If you have any of these issues it is likely your sensor is failing and requires replacement They are cheap and easytofind especially in the case of a Bosch model like ours You can also choose the GM version of this unit is also a good option 5 Tachometer A malfunctioning engine speed sensor could be the cause of a slew of issues in your vehicle please click the next internet page s an essential component of the transmission in your Audi because it relays information to the ECU about how fast or slow the engine is spinning This sensor can cause the transmission to fail and other car components to be affected The G5 engine speed sensor is located at the outside of the transmission above the flywheel ring gear It sends a signal to the ECU at pin T5549 through a grey wire The ECU uses this signal to regulate fuel and boost and also timig It also sends it to the G5 Tachometer in instrument cluster You can check the sensor for failure by checking continuity between it and the tachometer between the ECU pin T5549 and the instrument cluster connection via pin T6a1 trace 79trace 79 as well as between T6a1 and the instrument cluster pin T26a12 There should be a resistance of approximately 1000 ohms in these areas This is a typical part across the Audi 80 100 200 UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU Good parts could be found in wrecking yards