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How to Replace an Audi G28 Engine Speed Sensor<br><br>In this video, Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. This sensor is located at the top of the transmission above the flywheel ring gear. It transmits a signal the ECU via a grey wire (T55/49) which is then sent to the tachometer located in the instrument cluster.<br><br>1. Engine Speed Sensor<br><br>The sensor is located at the edge of the transmission above the flywheel ring gear G28 Engine Speed Sensor sends signals to ECU pin T55/49 through the grey wire. The ECU then uses this information to control the flow of fuel, timig and boost. It also sends signals to the G5 Tachometer located in the instrument cluster.<br><br>The sensor is used to link with the G40 Camshaft position Sensor. The ecu has to know when the crankshaft has reached TDC and also where the camshaft lies in order to activate the spark and injectors.<br><br>If this sensor fails to function, the ECU will display an error code P00160. This means that the Crank Shaft is not in sync with the Intake Camshaft. It could also be a sign of an issue with the chain or a jumped chain link in the upper chain of timing. However the code will not appear on its own, without additional information from other sensors (G4 and G40).<br><br>It's a bit tricky to test because there are various connector pins, and they all have different functions. The best way to do it is to measure the resistance between the ECU and the sensor. It should read about 1000 ohms if the sensor is at full operation. If you are having problems with this part, check for evidence of coolant or oil in the connector bay.<br><br>2. Injectors<br><br>Yesterday, when i was accelerating to the fullest speed from highway paytoll i had massive power loss like the engine is running out of gas or injectors aren't firing any more. In the morning, i removed the spark plugs, 3 were drenched with gazoline the 4th one was dry. I put tissue over each hole in the injector and when I start the engine without sparks, the three with gazoline jump out. The 4th one stays shut. I tested the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ I got 0ohm. So i assume the problem is in another place.<br><br>I also tried to reset the PID but without success. The car will start when the G28 is unplugged and it runs perfectly when it is plugged in but it still is experiencing intermittent misfires at higher RPM. The coolant sensor (G62) even when it is unplugged, shows a temperature of -49c. I also noticed that the oil gauge in the cockpit shows 2 bars but the actual pressure is zero.<br><br>I'm not sure what to do. I feel like i've pretty much ruled everything else out. However, i'm afraid that I might have missed something. If anyone has suggestions, please let me know! TIA!<br><br>3. Fuel Pump<br><br>The fuel pump in the g28 gets a signal from the RPM sensor. The GM-style transmitter is identical to the G4 sender and both work on the 80,100,200, UrS, and RS2 vehicles. You can easily locate the spare in a salvage shop or a parts store. It is simple to test them by putting your DMM in resistance mode and measure between pins 1 (with the bump on the connector end up) and 2 (2nd from left on the black end of the connector). They must be infinite Ohms.<br><br>4. ECU<br><br>Our 20vt turbo (3B AAN, ABY and ADU) engines are equipped with an ECU that has to know the speed and position of the crankshaft to make decisions about timing of the fuel injector, for example. To do this, it makes use of a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you have a problem with either of these sensors, the diagnostic scanner will show codes that could cause an engine shut down.<br><br>A failing G28 sensor could cause an inaccurate gearbox speed counter or a gearbox that shifts faster than normal, and/or a misfire while in gear. If you have any of these issues, it is most likely that your sensor is deteriorating and should be replaced. They're cheap and easy to find especially when they're an Bosch unit like ours. Alternately, GM's version this component is a good option.<br><br>5. Tachometer<br><br>A failing engine speed sensor could be the reason behind a slew of problems in your vehicle. It is a crucial part of your [http://fifaua.org/user/yardjudo1/ audi keyless go]'s transmission, as it sends information to the ECU about how the car's crankshaft is turning. When this sensor fails, it could cause problems [http://www.028bbs.com/space-uid-217821.html replacement key for audi a3] the transmission and the other [https://www.google.bt/url?q=https://ho-hayes-2.hubstack.net/5-laws-that-will-help-the-key-audi-industry car key replacement audi]'s components.<br><br>The G5 engine speed sensor is located at the outside of the transmission above the flywheel ring gear. It sends a signal directly to the ECU at pin T55/49 through a grey wire. The ECU uses this signal to regulate fuel and boost, and also to timigrate. It also sends it to the G5 Tachometer in instrument cluster. You can check the sensor for failure by checking continuity between it and the tachometer, between the ECU pin T55/49 and the instrument cluster connection on pin T6a/1 (trace [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. You should see the resistance to be around 1000 ohms between these points. This is a common component across the [https://elearnportal.science/wiki/Why_Audi_Convenience_Key_Can_Be_A_Lot_More_Hazardous_Than_You_Thought audi key fob not working] 80, 100 200, UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU so good parts could be found in wrecking yards.