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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician teaches you how to replace the G28 Engine Speed Sensor. This sensor is located near the edges of the transmission above the flywheel ring gear. It transmits a signal the ECU via an uncolored wire (T55/49), then to the tachometer 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 T55/49 using an uncolored wire. The ECU then uses this information to control the flow of fuel, timig and boost. It also sends an indication to the G5 Tachometer in instrument cluster. The sensor is used to connect with the G40 Camshaft position Sensor. Highly recommended Internet page must know when the crankshaft is TDC and the location of the camshaft so it can trigger spark and injectors accordingly. If this sensor fails to function, the ECU will display an error code P00160. This indicates that the Crank Shaft is out of sync with the Intake Camshaft. It could also be a sign of an issue with the chain or a jumped chain link in the upper timing chain. However the code will not appear on its own without additional information from other sensors (G4 and G40). Testing is a bit tricky because there are two connector pins, and they perform different functions but the best method of testing it is to measure resistance between the sensor and the ECU. It should read about 1000 ohms if the sensor is at full operation. Look for signs of coolant, or oil in the connector bay if you are experiencing issues with this component. 2. Injectors Yesterday, while accelerating at full speed from the highway paytoll, I experienced a big cut in power like the engine is running out of gas or injectors aren't firing at all. Today, i pulled out the spark plugs, 3 were drenched in gazoline, the 4th one was dry. When I start the engine without sparks, I put a piece of tissue on the top of each of the injector holes, the 3 drenched with gazoline jump out but the 4th stays closed. I checked the ground connection on ECU pins 14/55,30/55 and 48/55 i get 0ohm. I'm assuming the issue is in another place. I also tried to reset the PID without success. The car can start if the G28 is not plugged in and is running fine when it is connected however it has the intermittent misfire issue at higher RPM. The coolant sensor (G62), even when unplugged, still shows temperatures of -49c. Also i noticed that the gauge for oil pressure in the cockpit shows 2 bar, whereas the actual pressure is 0.0 if i crank up the engine. I'm not sure what to do, i think i've pretty much eliminated everything else. But i am afraid I may have missed something. If anyone has suggestions, please chime in! TIA! 3. Fuel Pump The fuel pump in the g28 receives a signal from the RPM sensor. The GM-style transmitter functions similarly to the G4 sender, and both operate on the 80,100,200, UrS, and RS2 vehicles. It is easy to find the spare in a salvage shop or a parts store. It is simple to test them – just put your DMM into resistance mode and measure the distance between pins 1 and 2 (with the bump on the connector's edge facing upwards). They must be infinite Ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines must know both the position and speed of the crankshaft to determine timing of fuel injectors, etc. It uses 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 lead to an engine shut down. A failing G28 sensor can cause an inaccurate gearbox speed counter, a gearbox that shifts faster than normal, or a misfire while in gear. It is probable that the sensor is failing and needs to be replaced if you experience any of these symptoms. They're inexpensive and easy to locate, especially if they're a Bosch sensor like ours. Alternatively, GM's version of this part would be a good option. 5. Tachometer A failing engine speed sensor could be the reason behind many problems in your car. It's an essential component of the transmission of your Audi since it sends information to the ECU about how fast or slow the engine of the car is spinning. If the sensor fails, it will disrupt the performance of the transmission as well as the rest of the car's components. The G5 engine speed sensor is located on the outside of the transmission just above the flywheel ring gear. It sends a signal directly to the ECU at pin T55/49 through an uncolored wire. The ECU then processes this signal to regulate fuel, timig, and boost and then sends it on to the G5 tachometer in the instrument cluster. You can test for sensor failure by checking continuity from the sensor to the tachometer. Also, you can examine the continuity between pins T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79trace [79]) and between pin T6a/1 and pin T26a/12. There should be a resistance of approximately 1000 ohms in these areas. This is the same across the Audi 80-100-200-RS2 range, from the 1985 MC up to the 1997 UrS An and 1995 RS2 DU, so you might find good ones in wrecking yards.