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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 outside of the transmission over the flywheel gear. It sends a message to the ECU through a grey wire T55/49, then to the tachometer on the instrument cluster. 1. Engine Speed Sensor Located on the edge of the transmission just above the flywheel ring gear the G28 Engine Speed Sensor sends signals to ECU pin T55/49 through a grey wire. The ECU then uses this information to control the boost, fuel, and timig. It also sends an indication to the G5 Tachometer within the instrument cluster. The sensor is used to connect with the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft is TDC and the location of the camshaft so it can start spark and injectors according to the situation. If this sensor fails the ECU will throw a P00160 code which means the Crank Shaft and Intake Camshaft are out of sync and could indicate the chain stretching or a jump link on the upper timing chain. The code will not appear without the additional information provided by other sensors (G4 or G40). next page is a bit tricky because there are two connector pins, and they perform different functions but the most effective method to test it is to measure the resistance between the sensor and the ECU. It should read approximately 1000 ohms when it is operating at its maximum. If you are having problems with this part, check for signs of oil or coolant in the connector bay. 2. just click the up coming web site , when accelerating from highway paytoll at maximum speed, i noticed a huge reduction in power. It was as if the engine was running out of gas. Or, my injectors were not firing. I took out the spark plugs this morning, 3 were soaked in gasoline, and the fourth was unclean. When i crank the engine without sparks, i place a tissue on top of each injector hole, the 3 drenched with gazoline pop out, but the 4th stays shut. I tested the ground connection of ECU pins 14,30, and 48/55. I got 0ohm. I'm assuming that the issue is elsewhere. I also tried to reset PID but without success. The car will start when the G28 is disconnected, but it works fine when the G28 plugged in. However the intermittent misfire issue continues to occur at higher RPM. The coolant sensor (G62) even when unplugged, still shows a temperature of -49c. I also noticed that the oil gauge in the cockpit shows 2 bar when the actual pressure is zero. I'm not sure what to do. I believe that I've all other possibilities out. I'm concerned that i may have missed something. If anyone has suggestions, please share them! TIA! 3. Fuel Pump The fuel pump in the g28 can be activated by a signal from the RPM sensor. The GM-style transmitter is the same as the G4 and both function in the 80 100, 200, UrS and RS2 cars so you can easily find one at a wrecking yard or from a parts store. Test them out to do – just put your DMM in resistance mode and take measurements between pins 1 (with the bump on the connector's side up) and 2 (2nd from the left on the black end of the connector). They must be infinite Ohms. 4. ECU Our 20vt turbo (3B AAN, ABY and ADU) engines are equipped with an ECU that must know the position and speed of the crankshaft in order to make a decision about timing of the fuel injector, for example. To do this, it utilizes a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you encounter a problem with either of these sensors, the diagnostic scanner will show codes that could cause the engine shutting down. A failing G28 sensor can cause an inaccurate speed counter for your gearbox and a gearbox which shifts faster than normal, or an unfire when in the gear. It is probable that your sensor is failing and needs to be replaced if you encounter any of these symptoms. They're inexpensive and easy to locate especially in the case of an Bosch unit like ours. Alternately, the GM version of this part is also a good choice. 5. Tachometer A failing engine sensor could cause a number of problems within your vehicle. It's a crucial component of the transmission of your Audi since it sends information to the ECU regarding how fast or slow the engine is turning. This sensor could cause the transmission to fail and other components in the car to be affected. The G5 engine speed sensor is situated on the outside of the transmission above the flywheel ring gear. It transmits a signal to the ECU at pin T55/49 through a grey wire. The ECU utilizes this signal to regulate the flow 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 verify continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79trace [79]), and between pin T6a/1 as well as pin T26a/12. You should detect a resistance of approximately 1000 ohms in these areas. This part is common 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 You may also find some good ones in wrecking yards.