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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 near the transmission's edge, above the flywheel gear. It transmits a signal to the ECU via the grey wire (T55/49) which is then sent to the tachometer located in the instrument cluster. 1. Engine Speed Sensor It is located on the outside of the transmission above the flywheel ring gear the G28 Engine Speed Sensor sends an electrical signal to ECU pin T55/49 using the grey wire. The ECU then utilizes this information to regulate the flow of fuel, timig and boost. It also sends an indication to the G5 tachometer inside the instrument cluster. The sensor is used to connect the G40 Camshaft position Sensor. audi spare key replacement g28carkeys.co.uk must be aware when the crankshaft is TDC and the location of the camshaft so it can activate spark and injectors accordingly. If this sensor fails the ECU will throw a P00160 code which means the Crank Shaft and Intake Camshaft are not in sync and possibly indicating the chain stretching or a jump link on the upper timing chain. However, the error code won't appear on its own, without additional information from other sensors (G4 and G40). Testing can be a bit difficult because there are two pins for the connector and they perform different functions however the best method of testing it is to measure resistance between the sensor and the ECU. When the sensor is functional, it should read around 1000 ohms. If you're experiencing issues with this part, check for signs of coolant or oil in the connector bay. 2. Injectors Yesterday, when accelerating from highway paytoll at a high speed I noticed a massive drop in power. It was like the engine was running out of gas. Or, my injectors weren't firing. I took out the spark plugs this morning, three were soaked with gasoline and the fourth was unclean. I put tissue over each injector hole and when i start the engine with no sparks, the 3 with gazoline jump out. The 4th one stays shut. I tested the ground connection on ECU pins 14/55, 30/55 and 48/55. i get 0ohm. I think the issue is in another location. I also tried to reset the PID with no success. The car will start when the G28 is unplugged, and it works fine when the G28 connected. However, the intermittent misfire problem continues to occur at higher RPM. The temperature sensor for coolant (G62) shows the wrong temp value -49c even when i unplug it. Also, i noticed that the gauge for oil pressure in the cockpit shows 2 bar while the actual pressure is 0.0 when I crank up the engine. I'm not sure what to do. I think I've all other possibilities out. But i'm worried that i might have missed something. If anyone has any suggestions, please let me know! TIA! 3. Fuel Pump The fuel pump in the g28 is activated by a signal by the RPM sensor. The GM-style transmitter is identical to the G4 sender and works on the 80,100,200, UrS, and RS2 vehicles. You can easily find the spare in a salvage shop or 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 connector's end). They should be infinite Ohms. 4. ECU Our 20vt turbo (3B AAN, ABY, and ADU) engines are equipped with an ECU that must know the speed and position of the crankshaft in order to make a decision about fuel injector timing 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 wrong, you will receive codes on the diagnostic scanner which could cause engine shut down. A failing G28 sensor can cause an inaccurate gearbox speed counter, a gearbox that shifts faster than normal, and/or a misfire in gear. It is possible that the sensor is failing and needs to be replaced if you notice any of these signs. The good thing is that they are very cheap and readily available, especially when you're looking at an Bosch unit which is what we have. If you prefer, GM's version of this part would be an excellent choice. 5. Tachometer A failing engine sensor could cause a number of problems in your car. It is an important part of the transmission of your Audi, as it transmits information to the ECU on how fast or slowly the car's engine is spinning. If the sensor fails, it can cause problems for the transmission, as well as the other car's components. The G5 engine sensor is located at the outskirts of the transmission, over the flywheel ring. It sends signals via an uncolored wire to the ECU pin T55/49. The ECU then processes the signal to control the flow of fuel, timig and boost, and also sends it on to the G5 Tachometer located in the instrument cluster. You can check the sensor for any failure by checking the continuity between it and the tachometer. You can also check continuity between ECU pin T55/49 and the instrument cluster connection to pin T6a/1 (trace [79trace [79]) and between T6a/1 and the instrument cluster pin T26a/12. You should observe around 1000 ohms of resistance between those two pins. This is the same across the Audi 80-100-200-RS2 series, starting from the 1985 MC all the way up to the 1997 UrS AN and the 1995 RS2 Du, so you might find them in wrecking yards.