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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician teaches how to replace the G28 Engine Speed Sensor This sensor is situated at the edge of transmission above the flywheel gear It sends a message to the ECU via the grey wire T5549 and then to the tachometer in the instrument cluster 1 Engine Speed Sensor The grey wire is located at the edges of the transmission above the flywheel ring This sensor sends signals through the grey wire to pin T5549 The ECU uses this information to regulate the amount of fuel and boost It also sends signals to the G5 tachometer in the instrument cluster The sensor is used to connect 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 to function the ECU will display an error code P00160 This indicates that the Crank Shaft is not in sync with the Intake Camshaft It could also indicate the possibility of a chain stretch or jumpy chain link in the upper timing chain However the error code wont be displayed on its own without additional information from other sensors G4 and G40 Its a bit tricky to test as there are different pins on the connector and each has its own functions The most effective method to test it is to measure the resistance between the ECU and the sensor It should read about 1000 ohms when the sensor is operating at its maximum If you are having problems with this sensor look for signs of coolant or oil in the connector bay 2 audi car keys accelerating full speed from highway paytoll i had an abrupt drop in power like the engine is out of gas or injectors arent firing any more This morning i pull out the spark plugs three were drenched with gazoline the fourth one was dry I put a piece of tissue over each hole in the injector and when I start the engine without sparks the ones with gazoline jump right out The fourth one remains closed I inspected the ground connection on ECU pins 1455 3055 and 4855 I get 0ohm So i assume the problem is elsewhere I also tried to reset PID but without success The car will start when the G28 is disconnected but it is running fine with the G28 connected However the intermittent misfire issue persists at higher RPM The coolant sensor G62 even when it is unplugged shows temperatures 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 as i think ive pretty much completely ruled out all other possibilities Im afraid i may have missed something Please let me know if you have any ideas TIA 3 Fuel Pump The fuel pump in the g28 can be activated by a signal by 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 which is why you can easily locate one at a salvage yard or at a parts store Testing them is easy put your DMM in resistance mode and take measurements between pins 1 with the bump on the connector end up and 2 2nd from left on the black end of the connector They should be infinite Ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY engines must know the speed and position of the crankshaft in order to make a decision about fuel injector timing etc It utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this If either of these goes badly you will see codes on the diagnostic scanner which can lead to engine shutdown Some of the signs of a failing G28 sensor include an inaccurate gearbox rev counter gears shifting quicker than normal andor misfiring when in gear If you are experiencing any of these problems it is most likely that your sensor is going bad and needs replacing The good thing is that they are very cheap and readily available especially when youre looking at a Bosch model which is what ours are If you prefer GMs version of this part would be an excellent choice 5 Tachometer A damaged engine sensor could cause a variety of issues within your vehicle It is a crucial part of your Audis transmission since it relays information to the ECU about how fast or slow the vehicles crankshaft is turning This sensor can cause the transmission to fail and other components in the car to be affected The G5 engine speed sensor is located on the edge of the transmission just above the flywheel ring gear and transmits a signal to the ECU at pin T5549 through an uncolored wire The ECU utilizes this signal to regulate the flow of fuel and boost and also timig It also transmits it to the G5 Tachometer located in the instrument cluster You can check for sensor failure by examining the continuity of the sensor to the tachometer You can also check continuity between pin T5549 of the ECU and pin T6a1 of the instrument cluster trace 79trace 79 and between pin T6a1 as well as pin T26a12 You should observe approximately 1000 ohms resistance between those two pins This is a standard part across the Audi 80 100 200 UrS and RS2 range from 1985 MC to the 1997 UrS AAN and 1995 RS2 ADU Good parts could be found in wrecking yards