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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. The sensor is located at the edge of transmission, above the flywheel gear. It transmits a signal to the ECU via the grey wire (T55/49) which is then sent to the tachometer within the instrument cluster. 1. Engine Speed Sensor The sensor is located at the edge of the transmission above the flywheel ring gear G28 Engine Speed Sensor sends a signal to ECU pin T55/49 using the grey wire. The ECU uses this information to control fuel and boost. It also sends an indicator to the G5 Tachometer within the instrument cluster. The sensor serves as a reference point to connect with the G40 Camshaft Position Sensor. The ecu has to know when the crankshaft has reached TDC and also the location of the camshaft to trigger the spark and injectors. If this sensor fails to function, the ECU will display a P00160 error code. This indicates that the Crank Shaft is out of alignment with the Intake Camshaft. It could also indicate an issue with the chain or a jumped chain link in the upper chain of timing. The code will not appear without the additional information provided by other sensors (G4 or G40). Testing can be a bit difficult since there are two connector pins, and they perform different functions but the best method to test it is to measure the resistance between the sensor and the ECU. When the sensor is functional, it should read about 1000 ohms. Look for evidence of coolant or oil in the connector bay if there are issues with this component. 2. Injectors Yesterday, while accelerating at full speed from the highway paytoll i had massive power loss like the engine is out of gas or the injectors are not firing at all. I pulled out the spark plugs this morning, 3 were soaked with gasoline and the fourth was dry. I put a piece of tissue over each injector hole and when I start the engine with no sparks, the three with gazoline jump right out. The fourth one remains shut. I tried to test the ground connections of ECU pins 14,30, and 48/55. I found zero ohm. I'm assuming that the issue is in another location. I also tried to reset the PID with no success. The car can start if the G28 is unplugged and runs fine when it is plugged in but it still has intermittent misfire issues at higher RPM. The coolant temperature sensor (G62) shows the wrong temperature of -49c, even if I unplug it. Also i noticed that the oil pressure gauge in the cockpit is showing 2 bar while the actual pressure is 0.0 when I crank up the engine. I don't know what to do. I feel like i've pretty much ruled everything else out. But i am afraid 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 from the RPM sensor. The GM-style transmitter is similar to the G4 sender and both work on the 80,100,200, UrS, and RS2 vehicles. It is easy to find a spare in a wrecking shop or parts store. It is simple to test them: simply put your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump at the connector end facing upwards). They must be infinite ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines needs to know both the speed and position of the crankshaft in order to make a decision about fuel injector timing, etc. To do this, it utilizes a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If audi car key of these sensors go bad you will get codes on the diagnostic scanner that can lead to engine shutdown. A damaged G28 sensor can cause an inaccurate speed counter for your gearbox or a gearbox that shifts faster than normal, or an unfire when in the gear. It is probable that the sensor is failing and needs to be replaced if you experience any of these signs. The good news is they are quite affordable and readily available, especially if you're looking at an Bosch unit like ours. You can also choose the GM version of this component is also a good choice. 5. Tachometer A malfunctioning engine speed sensor could be the reason behind a slew of issues in your vehicle. It's a vital component of the Audi's transmission as it sends information to the ECU about how fast or slow the vehicle's crankshaft is turning. When this sensor fails, it can disrupt the performance of the transmission, as well as the other car's components. The G5 engine sensor is located at the edge of the transmission, over the flywheel ring. It sends an electrical signal through an uncolored wire to the ECU pin T55/49. The ECU then uses and processes this signal to regulate fuel, timig, and boost as well as sends it on to the G5 tachometer in the instrument cluster. You can determine if the sensor is in failure by examining the continuity of the sensor to the tachometer. Additionally, you can check 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. You should see approximately 1000 ohms of resistance between those two pins. This is the same across the Audi 80-100-200-RS2 model, ranging from the 1985 MC all the way up to the 1997 UrS AN and the 1995 RS2 Du So, you may find good ones in wrecking yards.