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https://writeablog.net/statewrist55/10-apps-to-aid-you-control-your-audi-g28
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 on the outside of the transmission over the flywheel gear It transmits a signal the ECU via a grey wire T5549 then to the tachometer within the instrument cluster 1 Engine Speed Sensor The grey wire is located on the edge of transmission above the flywheel ring This sensor sends an electrical signal through the grey wire to pin T5549 The ECU utilizes this information to control the amount of fuel and boost It also sends an alert to the G5 Tachometer within the instrument cluster The sensor is used to correlate with the G40 Camshaft position Sensor The ecu has to know when the crankshaft has reached TDC and the position of the camshaft to trigger the spark and injectors If this sensor fails the ECU will show an error code P00160 which indicates that the Crank Shaft and Intake Camshaft are not in sync and possibly indicating the chain stretching or a jump link on the upper chain of timing The code wont appear without the additional information supplied by other sensors G4 or G40 It is a little tricky to test since there are different pins on the connector and they all have different functions The best method for doing this is by measuring the resistance between the ECU and the sensor If the sensor is functional it should read approximately 1000 ohms Look for signs of coolant or oil in the connector bay if you are experiencing issues with this component 2 Injectors Yesterday accelerating full speed from highway paytoll i experienced a big cut in power like the engine is running out of gas or the injectors are not firing anymore I took out the spark plugs this morning 3 were soaked in gasoline and the fourth was dry I placed a tissue over each injector hole and when I start the engine without sparks the 3 with gazoline jump out The 4th one stays closed I inspected the ground connection on ECU pins 145530554855145548 i get zero ohm So i assume the problem is elsewhere replacement car key audi tried to reset the PID but without success The car will start when the G28 is disconnected but it runs fine with the G28 plugged in However the intermittent misfire problem still occurs at higher RPM The coolant sensor G62 even when it is unplugged shows an ice temperature of 49c Also i noticed that the oil pressure gauge in the cockpit shows 2 bar when the actual pressure is 00 if i crank up the engine I dont know what to do I feel like ive pretty much ruled everything else out Im concerned that i may have missed something Let me know should you have any suggestions TIA 3 Fuel Pump The fuel pump in the g28 receives signals from the RPM sensor The GMstyle sender is the same as the G4 and they both work in the 80 100 200 UrS and RS2 cars so you can easily find one at a wrecking yard or in a local parts store It is simple to test them to do just put your DMM in resistance mode and take measurements between pins 1 with the bump on the connectors side up and 2 2nd from the left on the black connectors side They should be infinite Ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY engines needs to know both the position and speed of the crankshaft to make decisions regarding timing of the fuel injector etc It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this If either of these sensors go badly you will see codes on the diagnostic scanner which can cause the engine to shut down A damaged G28 sensor could result in an inaccurate speed counter for the gearbox and a gearbox which shifts more quickly than normal andor an unfire when in the gear If you experience any of these problems it is likely your sensor is deteriorating and should be replaced They are cheap and easytofind especially in the case of a Bosch unit like ours You can also choose the GM version of this unit is also a good choice 5 Tachometer A malfunctioning engine sensor can cause a variety of issues within your vehicle Its a vital component of your Audis transmission since it relays information to the ECU about how fast or slow the cars crankshaft is spinning If this sensor fails it will affect the performance of the transmission as well as the other cars components The G5 engine speed sensor is situated on the edge of the transmission just above the flywheel ring gear It sends a signal directly to the ECU at pin T5549 via a grey wire The ECU is then able to process this signal to control the flow of fuel timig and boost and also transmitting it to the G5 Tachometer located in the instrument cluster You can test the sensor for failure by checking continuity between it and the tachometer You can also check continuity between ECU pin T5549 and the instrument cluster connection to pin T6a1 trace 79 and between T6a1 and the instrument cluster pin T26a12 It should show approximately 1000 ohms of resistance between these two points This is a common part that is found across the Audi 80 100 200 UrS and RS2 range from 1985 MC to the 1997 UrS AAN and 1995 RS2 ADU so good ones could be available in wrecking yards