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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 on the edge of the transmission, above the flywheel ring gear. It sends a message to the ECU through the grey wire T55/49 and then to the tachometer located on the instrument cluster. 1. Engine Speed Sensor The grey wire is situated on the edge of transmission, just above the flywheel ring. The sensor sends signals through the grey wire to pin T55/49. The ECU uses this information to control boost and fuel. It also sends a signal to the G5 tachometer in the instrument cluster. The sensor serves as a reference point to connect with the G40 Camshaft Position Sensor. The ecu must be aware when the crankshaft is TDC and where the camshaft is located so that it can activate spark and injectors in the right way. If this sensor fails to function, the ECU will display a P00160 error code. This means that the Crank Shaft is out of line with the Intake Camshaft. audi spare key could also be a sign of the possibility of a chain stretch or jump in the chain link of the upper chain of timing. The code won't show without the additional information provided by other sensors (G4 or G40). It can be a bit difficult to test as there are various pins on the connector and each has its own functions. The best way to do it is by measuring the resistance between the ECU and the sensor. It should read around 1000 ohms if the sensor is at full operation. If you are having problems with this sensor, look for evidence of coolant or oil in the connector bay. 2. Injectors Yesterday, while accelerating from the highway paytoll at maximum speed I noticed a massive reduction in power. It was as if the engine was running out of gas. Or my injectors weren't firing. Today, i pulled out the spark plugs. Three were soaked with gazoline and the 4th one was dry. I put a piece of tissue over each injector hole and when i turn the engine on without sparks, the three with gazoline jump right out. The 4th one remains closed. I inspected the ground connection on ECU pins 14/55, 30/55 and 48/55. I get zero ohm. I'm assuming the issue is in another place. I also tried to reset the PID with no success. The car is able to start if the G28 is unplugged and is running fine when it is plugged in but it still is experiencing intermittent misfires at higher RPM. The coolant sensor (G62), even when it is unplugged, shows temperatures of -49c. I also noticed that the oil pressure gauge in the cockpit is showing 2 bar while the actual pressure is 0.0 if i crank up the engine. I'm not certain what to do, i believe that i've eliminated everything else. But i'm worried that i might have missed something. If anyone has any ideas please chime in! TIA! 3. Fuel Pump The fuel pump in the g28 is activated by a signal sent from the RPM sensor. The GM-style sensor 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 salvage yard or in a local parts store. It is easy to test them - just put your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump at the connector end facing upwards). They must be infinite ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines needs to know both the position and speed 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 goes bad you will get codes on the diagnostic scanner that could cause engine shut down. The signs of a failing G28 sensor include an inaccurate rev counter in the gearbox and gears that shift faster than normal and/or a misfire when you're in gear. If you are experiencing any of these problems, it is most likely that your sensor is deteriorating and needs replacing. They are cheap and easy-to-find, especially if they're a Bosch unit like ours. Alternatively, the GM version of this unit is also a great option. 5. Tachometer A faulty engine speed sensor could be the reason behind a slew of issues with your vehicle. It's an essential component of the transmission of your Audi because it relays information to the ECU on how fast or slowly the engine of the car is turning. This sensor can cause the transmission to malfunction 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 and sends a signal to the ECU at pin T55/49, via an uncolored wire. The ECU then uses and processes this signal to control fuel, timig, and boost and then sends it on to the G5 tachometer in the instrument cluster. You can test the sensor for failure by examining the continuity between it and the tachometer, between the ECU pin T55/49 and the instrument cluster connection on pin T6a/1 (trace [79trace [79]) and between T6a/1 and the instrument cluster pin T26a/12. It should show around 1000 ohms of resistance between those two pins. This is a typical component across the Audi 80, 100 200, UrS and RS2 range from 1985 MC until the 1997 UrS AAN and 1995 RS2 ADU. Good ones might be availble in wrecking yards.
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