How to Replace an Audi G28 Engine Speed Sensor In this video Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. This sensor is located near the edges of the transmission just above the flywheel ring gear. It sends a message to the ECU via a grey wire T55/49, then to the tachometer in the instrument cluster. 1. lost audi keys is located on the edge of transmission, above the flywheel ring. This sensor sends an electrical signal through the grey wire to pin T55/49. The ECU then utilizes this information to regulate fuel, timig and boost. It also sends an alert to the G5 Tachometer located in the instrument cluster. The sensor serves as a reference for comparing with the G40 Camshaft Position Sensor. The ecu must be aware when the crankshaft is TDC and where the camshaft is so it can activate spark and injectors in the right way. If this sensor fails, the ECU will show an error code P00160 which indicates that the Crank Shaft and Intake Camshaft are not in sync and possibly indicating the chain is stretched 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). It is a little tricky to test as there are various connector pins, and they all have different functions. The most effective method to test it is to measure the resistance between the ECU and the sensor. If the sensor is functional, it should read about 1000 ohms. lost audi keys for signs of coolant or oil in the connector bay if you have problems with this part. 2. Injectors Yesterday, when i was accelerating to the fullest speed from highway paytoll, i experienced a big cut in power as if the engine was running out of gas or the injectors aren't firing any more. I pulled out the spark plugs this morning and found that 3 were soaked in gasoline, and the 4th was dry. I placed a tissue over each injector hole, and when I start the engine without sparks, the three with gazoline jump right out. The 4th one remains closed. I checked the ground connection on ECU pins 14/55, 30/55 and 48/55. i get zero Ohm. I think the issue is elsewhere. 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 plugged in. However the intermittent misfire issue continues to occur at higher RPM. The temperature sensor for coolant (G62) shows the wrong temperature of that is -49c even after unplugging it. I also noticed that the oil gauge in the cockpit shows 2 bar while the actual pressure is zero. I'm not sure what to do. I feel like i've pretty much eliminated everything else. I'm afraid i may have missed something. Please let me know if you have any ideas! 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 identical to the G4 sender and both work on the 80,100,200, UrS, and RS2 vehicles. It is easy to find the spare in a salvage shop or a parts store. Test them out to do - just put your DMM in resistance mode and measure the resistance between pins 1 (with the bump on the connector's side up) and 2 (2nd from the left on the black connector's end). They should be infinite ohms. 4. ECU Our 20vt turbo (3B AAN, ABY and ADU) engines have an ECU that must be aware of the speed and position of the crankshaft to make decisions regarding timing of the fuel injectors, etc. To accomplish this, it makes use of a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these goes bad you will get codes on the diagnostic scanner which can cause the engine to shut down. Some of the symptoms of a failed G28 sensor are an inaccurate gearbox rev counter and gears that shift faster than normal, and/or a misfire when you're in gear. If you experience any of these issues, it is most likely that your sensor is going bad and should be replaced. They're cheap and easy to find particularly in the case of an Bosch model like ours. You can also choose the GM version of this component is also a good choice. 5. Tachometer A failing engine speed sensor could be the reason behind numerous issues in your car. It's an essential component of your Audi's transmission, since it relays information to the ECU about how fast or slow the car's crankshaft is spinning. If this sensor fails, it could disrupt the performance of the transmission and the rest of the car's components. The G5 engine sensor is located at the edge of the transmission, just above the flywheel ring. It transmits an electrical signal through an uncolored wire to the ECU pin T55/49. The ECU utilizes this signal to control the flow of fuel and boost and also timig. It also transmits it to the G5 Tachometer located in the instrument cluster. You can determine if the sensor is in failure by examining the continuity from the sensor to the tachometer. You can also 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 detect the resistance to be around 1000 ohms in these areas. This part is common across the Audi 80-100-200-RS2 series, starting beginning with the 1985 MC and up to the 1997 UrS An and 1995 RS2 Du You may also find some good ones in wrecking yards.
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