How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician teaches 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 an uncolored wire (T55/49) and then to the tachometer in the instrument cluster. 1. Engine Speed Sensor The grey wire is located at the edges of the transmission, above the flywheel ring. This sensor sends a signal via the grey wire to pin T55/49. The ECU then uses this information to control the boost, fuel, and timig. It also sends an indication to the G5 tachometer in the instrument cluster. The sensor is used to correlate with the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft is TDC and where the camshaft is located so that it can start spark and injectors according to the situation. If this sensor fails to function, the ECU will display a P00160 error code. This indicates that the Crank Shaft is not in sync with the Intake Camshaft. It could also indicate the possibility of a chain stretch or jump in the chain link of the upper chain. However, the code won't appear on its own without additional information from other sensors (G4 and G40). It can be a bit difficult to test as there are several pins on the connector, and each has its own functions. The best method for doing this is by measuring the resistance between the ECU and the sensor. If the sensor is operational, it should be reading approximately 1000 ohms. Check for signs of coolant, or oil in the connector bay if you are experiencing issues with this component. 2. Injectors Yesterday, as i was accelerating off the highway paytoll at maximum speed I noticed a massive reduction in power. It was like the engine was running out of gas. Or, my injectors were not firing. In the morning, i removed the spark plugs. Three were drenched in gazoline, the fourth was dry. When i crank the engine without sparks i put tissue on the top of each hole in the injector, the 3 drenched with gazoline leap out, however the 4th stay shut. I tested the ground connection of ECU pins 14,30 and 48/55. replacement audi car key got zero ohm. I think the issue is in another location. I also tried to reset the PID without success. The car will start when the G28 is unplugged, and it runs fine with the G28 plugged in. However the intermittent misfire issue persists at higher RPM. The coolant sensor (G62), even if it is not plugged in, shows an ice temperature of -49c. I also noticed that the oil gauge in the cockpit shows 2 bars but the actual pressure is 0. I'm not sure what to do. I feel like i've pretty much eliminated everything else. But i'm worried that I might have missed something. Please let me know If you have any suggestions! TIA! 3. Fuel Pump The fuel pump in the g28 is activated by a signal sent from the RPM sensor. The GM-style transmitter functions similarly to the G4 sender and both work on the 80,100,200, UrS, and RS2 vehicles. You can easily find the spare in a salvage shop or parts store. It is simple 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 must be infinite Ohms. 4. ECU The ECU of our 20vt turbo (3B AAN ABY ADU) engines needs to be aware of the speed and position of the crankshaft in order to make a decision about timing of the fuel injector, etc. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this. If either of these go badly, you will see codes on the diagnostic scanner which can lead to engine shutdown. A malfunctioning G28 sensor can cause an inaccurate speed counter for the gearbox or a gearbox that shifts more quickly than normal, or a misfire while in the gear. It is likely that your sensor is failing and needs to be replaced if you encounter any of these symptoms. They're cheap and easy to find especially if they're a Bosch model like ours. You can also choose the GM version of this part is also a good choice. 5. Tachometer A failing engine speed sensor could be a cause for many problems in your vehicle. It's an essential component of the transmission of your Audi, as it transmits information to the ECU on how fast or slow the engine is turning. 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 the transmission, just above the flywheel ring. It transmits an electrical signal through an uncolored wire to the ECU pin T55/49. replacement key for audi a3 to control the flow of fuel, timig and boost as well as transmitting it to the G5 tachometer inside the instrument cluster. You can check for sensor failure by examining the continuity of the sensor to the tachometer. Additionally, you can examine the continuity between pins T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79trace [79]) and between pin T6a/1 and pin T26a/12. You should see around 1000 ohms of resistance between those points. This is a common part across the Audi 80, 100, 200, UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU, so the best ones could be available in wrecking yards.
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