How to Replace an Audi G28 Engine Speed Sensor<br /><br />Charles the Humble Technician shows you how to replace the G28 Engine Speed Sensor. This sensor is situated on the outside of the transmission, above the flywheel gear. It sends a message to the ECU via an uncolored wire T55/49, then to the tachometer on the instrument cluster.<br /><br />1. Engine Speed Sensor<br /><br />The grey wire is situated on the outside of the transmission, above the flywheel ring. This sensor sends a signal via the grey wire to pin T55/49. The ECU utilizes this information to control boost and fuel. It also sends a signal to the G5 tachometer in the instrument cluster.<br /><br />The sensor is used to link with the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft is TDC and where the camshaft is so it can start spark and injectors in the right way.<br /><br />If this sensor fails, the ECU will show a P00160 code which means the Crank Shaft and Intake Camshaft aren't in sync, possibly indicating the chain is stretched or a jump link on the upper timing chain. The code will not appear without the additional information supplied by other sensors (G4 or G40).<br /><br />Testing is a bit tricky as there are two different connector pins and they perform different functions however the best method of testing it is by measuring resistance between the sensor and the ECU. It should read around 1000 ohms when it is at full operation. Look for evidence of coolant or oil in the connector bay if you have issues with this component.<br /><br />2. Injectors<br /><br />Yesterday, when accelerating from highway paytoll at a high speed I noticed a massive reduction in power. It was like the engine was running out of gas. Or my injectors were not firing. Today, i pulled out the spark plugs. Three were drenched in gazoline, the 4th one was dry. I put tissue over each hole in the injector and when I start the engine with no sparks, the 3 with gazoline jump out. The 4th one stays closed. I inspected the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ i get zero Ohm. I'm assuming the issue is in another place.<br /><br />I also tried to reset the PID without success. The car will start when the G28 is unplugged, and it works fine when the G28 connected. However the intermittent misfire issue continues to occur at higher RPM. The coolant sensor (G62), even when it is unplugged, shows a temperature of -49c. I also noticed that the oil pressure gauge in the cockpit is showing 2 bar, whereas the actual pressure is 0.0 when i rev the engine.<br /><br />I'm not sure what to do, i think i've pretty much eliminated everything else. However, i'm afraid that I might have missed something. If anyone has suggestions, please share them! TIA!<br /><br />3. Fuel Pump<br /><br />The fuel pump in the g28 can be activated by a signal sent by the RPM sensor. The GM-style sender is the same as the G4 and they both work 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. It is easy to test them: simply put your DMM into resistance mode and measure the distance between pins 1 and 2 (with the bump at the connector's end facing up). They should be infinite Ohms.<br /><br />4. ECU<br /><br /><a href="https://jsfiddle.net/wrenbeam89/4Lzjhmo8/">advanced key audi</a> (3B AAN, ABY and ADU) engines have an ECU that has to be aware of the speed and position of the crankshaft in order to make decisions about timing of the fuel injector, for example. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If <a href="https://articlescad.com/15-top-twitter-accounts-to-discover-more-about-audi-a4-car-key-replacement-228056.html">audi key replacement near me</a> are experiencing issues with either one of these, the diagnostic scanner will display codes that could cause the engine shutting down.<br /><br /><br /><br />A failing G28 sensor can cause an inaccurate gearbox speed counter or a gearbox that shifts faster than normal, or a misfire in gear. If you are experiencing any of these issues, it is most likely that your sensor is deteriorating and needs replacing. They're cheap and easy to find, especially in the case of an Bosch sensor like ours. Alternatively, GM's version of this part is a good option.<br /><br />5. Tachometer<br /><br />A failing engine sensor could cause a myriad of issues within your vehicle. It is a crucial part of the Audi's transmission as it sends information to the ECU about how the car's crankshaft is turning. This sensor can cause the transmission to malfunction and other components in the car to be affected.<br /><br />The G5 engine sensor is located near the edge of the transmission, over the flywheel ring. It sends a signal via gray wire to ECU pin T55/49. The ECU is then able to process this signal to control fuel, timig, and boost and then sends it on to the G5 tachometer inside 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 [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. You should detect a resistance of approximately 1000 ohms between these points. This part is common across the Audi 80-100-200-RS2 model, ranging from the 1985 MC all the way up to the 1997 UrS AN and 1995 RS2 Du You may also find some good ones in wrecking yards.<br /><br />