mncsi56@rxss1.jenniferlawrence.uk – https://www.thekeylab.co.uk/audi-car-keys/

How to Replace an Audi G28 Engine Speed SensorIn this video Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. audi lost key is located near the transmission’s edge just above the flywheel gear. It transmits a signal to the ECU via an uncolored wire (T55/49) and then to the tachometer within the instrument cluster.1. Engine Speed SensorThe grey wire is located on the outside of the transmission, directly above the flywheel ring. The sensor sends a signal via the grey wire to pin T55/49. The ECU utilizes this information to control fuel and boost. It also sends an indication to the G5 Tachometer in instrument cluster.The sensor serves as a reference for comparing with the G40 Camshaft Position Sensor. The ecu has to know when the crankshaft reached TDC and also the location of the camshaft so that it can activate the spark and injectors.If this sensor fails, the ECU will throw an error code P00160 which indicates that the Crank Shaft and Intake Camshaft are out of sync, possibly indicating chain stretch or a jumped link on the upper timing chain. However, the error code won’t appear on its own, without additional information from other sensors (G4 and G40).It is a little tricky to test since there are different pins on the connector, and each one has different functions. The best way to do it is by measuring the resistance between the ECU and the sensor. When the sensor is operational, it should read approximately 1000 ohms. If you are having problems with this component, look for evidence of coolant or oil in the connector bay.2. InjectorsYesterday, while accelerating at full speed from the highway paytoll, I experienced an abrupt drop in power as if the engine was running out of gas or the injectors are not firing any more. I pulled out the spark plugs this morning, 3 were drenched in gasoline and the fourth was dry. 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 stay shut. I tested the ground connection of ECU pins 14,30 and 48/55. I found zero ohm. Therefore, i think the issue is somewhere else.I also tried to reset PID without success. The car can start if the G28 is unplugged and is running fine when it is connected but it still is experiencing intermittent misfires 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 bar while the actual pressure is 0.I don’t know what to do. I feel like i’ve pretty much eliminated everything else. I’m worried that i might have missed something. If anyone has suggestions, please share them! TIA!3. Fuel PumpThe fuel pump of the g28 receives a signal 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 locate an extra in a wrecking shop or parts store. It is simple to test them: simply put your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump at the connector end facing up). They must be infinite Ohms.4. ECUOur 20vt turbo (3B, AAN, ABY and ADU) engines have an ECU that needs to know the speed and position of the crankshaft in order to make decisions about timing of the fuel injectors, etc. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If either of these go wrong, you will receive codes on the diagnostic scanner that could cause engine shut down.Some of the symptoms of a failed G28 sensor include an inaccurate rev counter in the gearbox the gears are shifting faster than normal and/or a misfire when you are in gear. If you experience any of these issues it is likely your sensor is failing and should be replaced. The good news is that they are quite affordable and readily available, especially if you’re looking at a Bosch sensor, which is what ours are. Alternatively, GM’s version of this part is a good option.5. TachometerA malfunctioning engine sensor can cause a variety of issues in your car. It’s a crucial component of the transmission in your Audi because it relays information to the ECU on how fast or slow the car’s engine is turning. This sensor could cause the transmission to fail and other components in the car to be affected.The G5 engine sensor is located at the outskirts of the transmission, just above the flywheel ring. It sends signals via gray wire to ECU pin T55/49. The ECU then uses and processes this signal to regulate fuel, timig and boost, and also transmitting it to the G5 tachometer in the instrument cluster. You can check the sensor for any failure by checking the continuity between it and the tachometer, between ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. You should observe approximately 1000 ohms of resistance between those two pins. This is a typical part across the Audi 80 100, 200, UrS and RS2 range from 1985 MC to the 1997 UrS AAN and 1995 RS2 ADU, so the best ones might be availble in wrecking yards.