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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. This sensor is located at the top of the transmission above the flywheel ring gear. It transmits a signal the ECU via a grey wire (T55/49) and then to the tachometer within the instrument cluster. 1. Engine Speed Sensor The grey wire is situated on the outside of the transmission, directly above the flywheel ring. The sensor sends an electrical signal through the grey wire to pin T55/49. The ECU utilizes this information to control the amount of fuel and boost. It also sends signals to the G5 Tachometer located in the instrument cluster. The sensor is used to link with the G40 Camshaft position Sensor. The ecu must be aware when the crankshaft is TDC and where the camshaft is so it can trigger spark and injectors according to the situation. If this sensor fails, 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 an issue with the chain or a jumpy chain link in the upper chain. However, the error code won't appear on its own without additional information from other sensors (G4 and G40). Testing is a bit tricky because there are two pins for the connector and they perform different functions but the best method to test it is by measuring resistance between the sensor and the ECU. It should read approximately 1000 ohms when it is operating at its maximum. Examine for evidence of coolant or oil in the connector bay if there are problems with this part. 2. Injectors Yesterday, while accelerating at full speed from the highway paytoll, I experienced an abrupt drop in power like the engine is out of gas or the injectors aren't firing at all. This morning i pull out the spark plugs, 3 were drenched in gazoline, the fourth one was dry. I put tissue over each hole in the injector and when I turn the engine on without sparks, the ones with gazoline jump right out. The 4th one remains shut. I tested the ground connection of ECU pins 14,30 and 48/55. I got 0ohm. I'm assuming that the issue is in another location. I also tried to reset the PID without success. The car can start when the G28 is not plugged in and it runs perfectly when it is plugged in but it still has the intermittent misfire issue at higher RPM. The temperature sensor for coolant (G62) shows the wrong temperature value of -49c even when i unplug it. Also, audi a3 key replacement near me noticed that the gauge for oil pressure in the cockpit shows 2 bar while the actual pressure is 0.0 when i rev the engine. I don't know what to do. I think I've ruled everything else out. However, i'm afraid that i might have missed something. Please let me know If you have any suggestions! TIA! 3. Fuel Pump The fuel pump of the g28 receives a signal from the RPM sensor. The GM-style sender is the same as the G4 and both function in the 80, 100, 200, UrS and RS2 cars which is why you can easily locate one at a junkyard or from a parts store. It is easy to test them – just put your DMM into resistance mode and determine the distance between pins 1 and 2 (with the bump at the connector end facing up). They must be infinite ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY) engines must be aware of the position and speed the crankshaft to determine timing of fuel injectors, etc. It utilizes 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 show the codes that could trigger the engine shutting down. The signs of a failed G28 sensor are an inaccurate rev counter for the gearbox and gears that shift faster than normal and/or a misfire when in gear. It is likely that the sensor is failing and requires to be replaced if you experience any of these signs. They're inexpensive and easy to locate particularly when they're a Bosch unit like ours. You can also choose the GM version of this part is also a good choice. 5. Tachometer A malfunctioning engine sensor can cause a variety of issues in your car. It's an essential component of the Audi's transmission because it communicates to the ECU about how fast or slow the car's crankshaft is turning. If the sensor fails, it will affect the performance of the transmission as well as the rest of the car's components. The G5 engine speed sensor is located at the edge of the transmission above the flywheel ring gear and sends a signal directly to the ECU at pin T55/49 via an uncolored wire. The ECU utilizes this signal to regulate the amount of fuel and boost, as well as timig. It also transmits it to the G5 Tachometer located in the instrument cluster. You can test the sensor for any failure by checking the continuity between it and the tachometer, between ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79trace [79]) as well as between T6a/1, and the instrument cluster pin T26a/12. You should see an average resistance of 1000 ohms between these points. This is a standard part that is found across the Audi 80, 100, 200, UrS and RS2 range from 1985 MC until the 1997 UrS AAN and 1995 RS2 ADU. Good ones might be availble in wrecking yards.