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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. The sensor is situated at the top of the transmission just above the flywheel ring gear. It transmits a signal the ECU via a grey wire (T55/49), then to the tachometer located in the instrument cluster. 1. Engine Speed Sensor The grey wire is situated at the edges of the transmission, above the flywheel ring. The sensor sends an electrical signal through the grey wire to pin T55/49. The ECU utilizes this information to control the amount of fuel and boost. It also sends a signal to the G5 Tachometer located in the instrument cluster. The sensor is used to connect 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 activate spark and injectors accordingly. If this sensor fails the ECU will display the P00160 error, which means the Crank Shaft and Intake Camshaft aren't in sync and could indicate chain stretch or a jumped link on the upper timing chain. However the code will not appear on its own without additional information from other sensors (G4 and G40). Testing can be a bit difficult as there are two different connector pins, and they have different functions but the best way to test it is to measure the resistance between the sensor and the ECU. When the sensor is operational, it should be reading approximately 1000 ohms. Look for signs of coolant or oil in the connector bay if there are issues with this part. 2. Injectors Yesterday, while accelerating at full speed from the highway paytoll i had massive power loss as if the engine was running out of gas or injectors aren't firing anymore. In the morning, i removed the spark plugs. Three were drenched in gazoline, the fourth one was dry. I put tissue over each injector hole, and when I start the engine without sparks, the three with gazoline jump out. The fourth one remains shut. I inspected the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ I get zero ohm. I think the issue is somewhere else. I also tried to reset the PID with no success. The car will start when the G28 is unplugged, and it works fine when the G28 connected. However the intermittent misfire issue persists at higher RPM. The temperature sensor for coolant (G62) shows the wrong temperature of -49c even when i unplug it. I also noticed that the oil gauge in the cockpit shows 2 bars when the actual pressure is 0. Recommended Webpage 'm not sure what to do. I feel like i've pretty much all other possibilities out. However, i'm afraid that I may have missed something. If anyone has any suggestions, please let me know! TIA! 3. Fuel Pump The fuel pump in the g28 is activated by a signal sent from the RPM sensor. The GM-style transmitter is the same as the G4 and they both work in the 80, 100 200, UrS and RS2 cars which is why you can easily locate one at a junkyard or from a parts store. Test them out - put your DMM in resistance mode and measure between pins 1 (with the bump on the connector end up) and 2 (2nd from left on the black connector's side). They must be infinite Ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY) engines requires to know both the position and speed the crankshaft in order to make a decision about timing of fuel injectors, etc. It utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If you have a problem with either one of these, the diagnostic scanner will display the codes that could trigger an engine shut down. The signs of a failed G28 sensor include an inaccurate rev counter in the gearbox and gears that shift faster than normal and/or misfiring when you're in gear. If you experience any of these issues, it is most likely that your sensor is deteriorating and requires replacement. The good news is that they are very affordable and easily accessible particularly when you're looking at the Bosch model, like ours. You can also choose the GM version of this unit is also a good choice. 5. Tachometer A malfunctioning engine sensor can cause a variety of issues within your vehicle. It's an essential component of the transmission of your Audi because it relays information to the ECU on how fast or slow the engine is turning. This sensor can cause the transmission to fail and other components of the car to be affected. The G5 engine speed sensor is situated on the edge of the transmission above the flywheel ring gear and transmits a signal to the ECU at pin T55/49 via an uncolored wire. The ECU then processes the signal to control the flow of fuel, timig and boost as well as sends it on to the G5 tachometer inside the instrument cluster. You can check for sensor failure by examining the continuity of the sensor to the tachometer. Also, you can verify continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79]), and between pin T6a/1 and pin T26a/12. You should see a resistance of approximately 1000 ohms between these points. This part is common across the Audi 80-100-200-RS2 series, starting from the 1985 MC all the way up to the 1997 UrS An and 1995 RS2 Du You may also find them in wrecking yards.
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