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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 at the edge of transmission just above the flywheel gear. It sends a message to the ECU through a grey wire T55/49, then to the tachometer in the instrument cluster. 1. Engine Speed Sensor Located on the edge of the transmission, above the flywheel ring gear G28 Engine Speed Sensor sends an electrical signal to ECU pin T55/49 using an uncolored wire. The ECU utilizes this information to regulate boost and fuel. Going On this page sends a signal to the G5 Tachometer located in the instrument cluster. The sensor is used as a reference for comparing with the G40 Camshaft Position Sensor. The ecu must be aware when the crankshaft is TDC and the location of the camshaft so it can trigger spark and injectors accordingly. If this sensor fails, the ECU will display a P00160 error message. This means that the Crank Shaft is not in line with the Intake Camshaft. It could also indicate a chain stretch or a jump in the chain link of the upper chain. The code won't appear without the additional information provided by other sensors (G4 or G40). Testing is a bit tricky as there are two different connector pins, and they perform different functions but the best way to test it is by measuring resistance between the sensor and the ECU. It should read about 1000 ohms when it is operating at its maximum. If you are having problems with this sensor, look for signs of oil or coolant in the connector bay. 2. Injectors Yesterday, when i was accelerating to the fullest speed from highway paytoll, i experienced massive power loss like the engine is out of gas or injectors are not firing anymore. This morning i pull out the spark plugs, 3 were soaked with gazoline and the fourth one was dry. I put a piece of tissue over each injector hole and when I start the engine with no sparks, the three that have gazoline pop right out. The fourth one remains closed. I inspected the ground connection on ECU pins 14/55, 30/55 and 48/55. I got 0ohm. I assume that the problem is somewhere else. I also tried to reset the PID without success. The car will start when the G28 is not plugged in and it runs perfectly when it is connected but it still has the intermittent misfire issue 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 bar while the actual pressure is 0. I don't know what to do. I feel like i've pretty much all other possibilities out. I'm afraid i may have missed something. Let me know should you have any suggestions! TIA! 3. Fuel Pump The fuel pump of the g28 receives signals from the RPM sensor. The GM-style sensor is the same as the G4 and both function in the 80, 100 200, UrS and RS2 cars so you can easily find one at a salvage yard or in a local parts store. Testing them is easy to do – just put your DMM in resistance mode and measure the resistance between pins 1 (with the bump on the connector's end up) and 2 (2nd from left on the black connector's end). They should be infinite Ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY) engines requires to know the speed and position of the crankshaft to make decisions regarding timing of fuel injectors, etc. To accomplish this, it makes use of a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you have a problem with either one of these, the diagnostic scanner will show codes that could cause an engine shut down. Some of the signs of a failed G28 sensor are an inaccurate gearbox rev counter the gears are shifting faster than normal and/or misfiring when you are in gear. If you have any of these problems, it is likely your sensor is going bad and needs replacing. They are cheap and easy-to-find particularly in the case of an Bosch sensor like ours. If you prefer, GM's version of this part would be an excellent choice. 5. Tachometer A malfunctioning engine sensor can cause a number of problems within your vehicle. It's a crucial component of the transmission of your Audi, as it transmits information to the ECU on how fast or slowly the engine of the car is spinning. This sensor can cause the transmission to fail and other car components to be affected. The G5 engine sensor is located near the edge of the transmission, just above the flywheel ring. It transmits an electrical signal through an uncolored wire to the ECU pin T55/49. The ECU utilizes this signal to regulate the flow of fuel and boost and also to timigrate. It also sends it to the G5 Tachometer located in the instrument cluster. You can determine if the sensor is in failure by checking continuity from the sensor to the tachometer. You can also verify continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79]), and between pin T6a/1 and pin T26a/12. It should show approximately 1000 ohms of resistance between those points. This is a typical part across the Audi 80, 100, 200, UrS and RS2 range from 1985 MC to the 1997 UrS AAN and 1995 RS2 ADU, so the best ones might be availble in wrecking yards.