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How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic demonstrates how to replace the G28 engine speed sensor. The sensor is located on the edge of the transmission, above the flywheel ring gear. It transmits a signal to 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 located on the outside of the transmission, just above the flywheel ring. This sensor sends signals through the grey wire to pin T55/49. The ECU then utilizes this information to regulate fuel, timig and boost. It also sends signals to the G5 tachometer inside 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 located so that it can trigger spark and injectors accordingly. If this sensor fails the ECU will display a P00160 code which means the Crank Shaft and Intake Camshaft are not in sync, possibly indicating chain stretch or a jumped link on the upper chain of timing. The code won't appear without the additional information provided by other sensors (G4 or G40). It's a bit tricky to test as there are various pins on the connector and each one has different functions. The most effective method to test it is to measure the resistance between the ECU and the sensor. When the sensor is fully functional, it should read approximately 1000 ohms. If you are having problems with this sensor, look for evidence of coolant or oil in the connector bay. 2. Injectors Yesterday, as i was accelerating off the highway paytoll at full speed I noticed a massive reduction in power. It was like the engine was running out of gas. Or, my injectors weren't firing. In the morning, i removed the spark plugs, three were drenched with gazoline the fourth one was dry. I put tissue over each hole in the injector and when I start the engine without sparks, the 3 with gazoline jump out. The 4th one stays closed. I checked the ground connection of ECU pins 14,30 and 48/55. I found 0ohm. I assume that the problem is elsewhere. I also tried to reset PID without success. The car will start when the G28 is not plugged in and it runs perfectly when it is connected however it has the intermittent misfire issue at higher RPM. The temperature sensor for the coolant (G62) shows the wrong temperature value of -49c even when i unplug it. I also noticed that the oil gauge in the cockpit shows 2 bars but the actual pressure is 0. I don't know what to do. I think I've eliminated everything else. But i'm worried 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 identical to the G4 and both are used in the 80 100 200, UrS and RS2 cars so you can easily find one at a salvage yard or at a parts store. It is simple to test them – just switch your DMM into resistance mode and measure the distance between pins 1 and 2 (with the bump at the connector end facing upwards). They should be infinite ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY) engines requires to know both the speed and position of the crankshaft to determine fuel injector timing, etc. It utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If either of these goes bad you will get codes on the diagnostic scanner that can lead to engine shutdown. Some of the symptoms of a malfunctioning G28 sensor are an inaccurate gearbox rev counter and gears that shift faster than normal and/or a misfire when you are in gear. If you experience any of these issues it is most likely that your sensor is deteriorating and should be replaced. The good news is that they are very cheap and readily available particularly in the case of an Bosch model, which is what ours are. If how to open audi car key prefer, GM's version of this component is an excellent choice. 5. Tachometer A malfunctioning engine speed sensor could be a cause for many problems in your car. It is an important part of the transmission in your Audi, as it transmits information to the ECU regarding how fast or slowly the engine is spinning. This sensor can cause the transmission to malfunction and other components of the car to be affected. The G5 engine speed sensor is situated on the edge of the transmission, above the flywheel ring gear and sends a signal to the ECU at pin T55/49 through a grey wire. The ECU utilizes this signal to regulate the amount of fuel and boost, and also to timigrate. It also relays it to the G5 Tachometer inside the instrument cluster. You can test for sensor failure by examining the 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 [79]) and between pin T6a/1 as well as pin T26a/12. You should see an average resistance of 1000 ohms in these areas. This part is common across the Audi 80-100-200-RS2 series, starting from the 1985 MC up to the 1997 UrS An and 1995 RS2 Du You may also find them in wrecking yards.