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https://squareblogs.net/horncrook29/this-is-the-intermediate-guide-on-replacement-key-for-audi
How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor This sensor is located near the transmissions edge over the flywheel gear It transmits a signal to the ECU via a grey wire T5549 then to the tachometer in the instrument cluster 1 Engine Speed Sensor The grey wire is located on the edge of transmission above the flywheel ring The sensor sends signals through the grey wire to pin T5549 The ECU then utilizes this information to regulate the flow of fuel timig and boost It also sends an indication to the G5 Tachometer in instrument cluster The sensor is used to correlate the G40 Camshaft position Sensor The ecu must be aware when the crankshaft is TDC and the location of the camshaft so it can activate spark and injectors according to the situation If this sensor fails when it fails the ECU will display a P00160 error code Read Even more means that the Crank Shaft is out of alignment with the Intake Camshaft It could also indicate an issue with the chain or a jump in the chain link of the upper chain However the code wont be displayed on its own without additional information from other sensors G4 and G40 Testing can be a bit difficult because there are two pins for the connector and they perform different functions but the most effective way to test it is by measuring resistance between the sensor and the ECU It should read about 1000 ohms when it is operating at its maximum If you are having problems with this component look for signs of oil or coolant in the connector bay 2 Injectors Yesterday accelerating full speed from highway paytoll I experienced massive power loss like the engine is running out of gas or the injectors are not firing anymore In the morning i removed the spark plugs Three were drenched in gazoline the 4th one was dry When I crank the engine with no sparks i put tissue on top of each injector hole and the 3 that were drenched in gazoline leap out however the 4th stay closed I checked the ground connection of ECU pins 1430 and 4855 I found 0ohm So i assume the problem is elsewhere I also tried to reset the PID with no success The car will start when the G28 is unplugged and it runs fine with the G28 plugged in However the intermittent misfire problem continues to occur at higher RPM The coolant sensor G62 even when unplugged still shows temperatures of 49c I also noticed that the oil gauge in the cockpit shows 2 bar while the actual pressure is 0 Im not certain what to do i think ive pretty much eliminated everything else But im worried that i might have missed something Please let me know if you have any ideas TIA 3 Fuel Pump The fuel pump in the g28 receives signals from the RPM sensor The GMstyle transmitter is similar to the G4 sender and works on the 80100200 UrS and RS2 vehicles You can easily locate a spare in a wrecking shop or a parts store Testing them is easy by putting your DMM in resistance mode and measure between pins 1 with the bump on the connector end up and 2 2nd from the left on the black connectors side They must be infinite Ohms 4 ECU The ECU in our 20vt turbo 3B AAN ABY engines must know both the position and speed the crankshaft in order to make a decision about fuel injector timing etc In order to do this it uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 If you are experiencing issues with either one of these the diagnostic scanner will show codes that could cause the engine shutting down A damaged G28 sensor can cause an inaccurate gearbox speed counter or a gearbox that shifts faster than normal or a misfire while in gear It is probable that your sensor is failing and needs to be replaced if you experience any of these signs Theyre inexpensive and easy to locate particularly in the case of a Bosch unit like ours audi car key replacement can also choose the GM version of this part is also a good option 5 Tachometer A malfunctioning engine speed sensor could be the cause of many problems in your vehicle It is a crucial part of the Audis transmission because it communicates to the ECU about how the cars crankshaft is spinning This sensor can cause the transmission to malfunction and other car components to be affected The G5 engine sensor is located at the edge of transmission above the flywheel ring It sends signals via a gray wire to the ECU pin T5549 The ECU then processes this signal to control the flow of fuel timig and boost as well as sends it on to the G5 Tachometer located in the instrument cluster You can check for sensor failure by examining the continuity from the sensor to the tachometer You can also check continuity between pin T5549 of the ECU and pin T6a1 of the instrument cluster trace 79trace 79 and between pin T6a1 and pin T26a12 It should show approximately 1000 ohms of resistance between these two points This part is common across the Audi 80100200RS2 series starting from the 1985 MC up to the 1997 UrS An and 1995 RS2 DU You may also find good ones in wrecking yards
