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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows you how to replace the G28 Engine Speed Sensor The sensor is located on the outside of the transmission above the flywheel gear It transmits a signal the ECU via the grey wire T5549 which is then sent to the tachometer located in the instrument cluster 1 Engine Speed Sensor The grey wire is situated at the edges of the transmission directly above the flywheel ring The sensor sends a signal via the grey wire to pin T5549 The ECU then utilizes this information to regulate fuel timig and boost It also sends signals to the G5 tachometer inside the instrument cluster The sensor is used to connect with the G40 Camshaft position Sensor The ecu needs to know when the crankshaft is TDC and where the camshaft is so it can trigger 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 not in sync with the Intake Camshaft It could also be a sign of a chain stretch or a jumped chain link in the upper chain However the code wont appear on its own without additional information from other sensors G4 and G40 It can be a bit difficult to test because there are various pins on the connector and they all have different functions The best way to do it is by measuring the resistance between the ECU and the sensor When the sensor is operational it should be reading around 1000 ohms Check for evidence of coolant or oil in the connector bay if you are experiencing problems with this part 2 Injectors Yesterday while accelerating at full speed from the highway paytoll I experienced a big cut in power as if the engine was running out of gas or injectors are not firing any more In the morning i removed the spark plugs 3 were soaked with gazoline and the fourth one was dry When I start the engine with no sparks i put tissue on the top of each of the injector holes and the 3 that were drenched in gazoline leap out however the 4th stay shut I tested the ground connection on ECU pins 14553055 and 4855 i get 0ohm Im assuming that the issue is in another location I also tried to reset the PID but with no luck The car can start when the G28 is not plugged in and it runs perfectly when it is plugged in however it has intermittent misfire issues at higher RPM The coolant sensor G62 even when unplugged still shows an ice temperature of 49c Also i noticed that the gauge for oil pressure in the cockpit shows 2 bar whereas the actual pressure is 00 when I crank up the engine Im not sure what to do i think ive pretty much eliminated everything else But i am afraid I might have missed something Let me know if you have any ideas TIA 3 Fuel Pump The fuel pump in the g28 receives a signal from the RPM sensor The GMstyle transmitter is identical to the G4 sender and both operate on the 80100200 UrS and RS2 vehicles You can easily locate the spare in a salvage shop or a parts store Testing them is easy put your DMM in resistance mode and take measurements between pins 1 with the bump on the connectors end up and 2 2nd from the left on the black connectors end They should be infinite Ohms 4 ECU Our 20vt turbo 3B AAN ABY and ADU engines have an ECU that needs to be aware of the speed and position of the crankshaft to make decisions regarding fuel injector timing etc In order to do this it uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 If either of these goes bad you will get codes on the diagnostic scanner which can lead to engine shutdown A damaged G28 sensor can cause an inaccurate speed counter for the gearbox and a gearbox which shifts more quickly than normal or a misfire in the gear If you experience any of these problems it is likely that your sensor is going bad and requires replacement The good thing is that they are very affordable and easy to find especially when youre looking at the Bosch unit which is what ours are You can also choose the GM version of this part is also a good option 5 Tachometer A faulty engine speed sensor could be the reason behind many issues with your car Its a crucial component of the transmission in your Audi since it sends information to the ECU regarding how fast or slowly the engine is spinning When this sensor fails it could affect the performance of the transmission as well as the other cars components The G5 engine sensor is located at the outskirts of the transmission just above the flywheel ring It sends a signal via a gray wire to the ECU pin T5549 The ECU uses this signal to control the flow of fuel and boost and also timig audi car keys transmits it to the G5 Tachometer located in the instrument cluster You can determine if the sensor is in failure by examining the continuity from the sensor to the tachometer Also you can check continuity between pin T5549 of the ECU and pin T6a1 of the instrument cluster trace 79trace 79 and between pin T6a1 and pin T26a12 It should show around 1000 ohms of resistance between those points This is a common feature across the Audi 80100200RS2 series starting from the 1985 MC up to the 1997 UrS AN and the 1995 RS2 DU You may also find good ones in wrecking yards
