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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician teaches you how to replace the G28 Engine Speed Sensor. This sensor is located on the edge of the transmission above the flywheel ring gear. It transmits a signal the ECU via the grey wire (T55/49), then to the tachometer located in the instrument cluster. 1. Engine Speed Sensor The sensor is located at the edge of the transmission above the flywheel ring gear the G28 Engine Speed Sensor sends a signal to ECU pin T55/49 via a grey wire. The ECU then utilizes this information to regulate the flow of fuel, timig and boost. It also sends a signal to the G5 Tachometer located in the instrument cluster. The sensor is used to link with the G40 Camshaft position Sensor. The ecu must know when the crankshaft has reached TDC, and where the camshaft lies to trigger the spark and injectors. If this sensor fails, the ECU will display the P00160 error, which means the Crank Shaft and Intake Camshaft aren't in sync and possibly indicating the chain stretching or a jump link on the upper chain of timing. The code will not appear without the additional information supplied by other sensors (G4 or G40). Testing can be a bit difficult as there are two different connector pins, and they serve different purposes but the best method of testing it is by measuring resistance between the sensor and the ECU. It should read approximately 1000 ohms when it is at full operation. If you are having problems with this part, check for signs of oil or coolant in the connector bay. 2. Injectors Yesterday accelerating full speed from highway paytoll i had massive power loss as if the engine was running out of gas or the injectors are not firing anymore. I pulled out the spark plugs this morning, 3 were soaked in gasoline, and the fourth was dry. I put tissue over each injector hole, and when I start the engine with no sparks, the 3 that have gazoline pop right out. The 4th one stays closed. I tested the ground connection of ECU pins 14,30, and 48/55. I got 0ohm. I'm assuming that the issue is elsewhere. I also tried to reset the PID with no success. The car can start when the G28 is unplugged and runs fine when it is plugged in, but still is experiencing intermittent misfires at higher RPM. audi a1 keys for the coolant (G62) shows the wrong temperature of -49c even when i unplug it. Also i noticed that the gauge for oil pressure in the cockpit is showing 2 bar, whereas the actual pressure is 0.0 if i crank up the engine. I don't know what to do. I feel like i've pretty much eliminated everything else. However, i'm afraid that I might have missed something. Please let me know should you have any suggestions! TIA! 3. Fuel Pump The fuel pump in the g28 can be activated by a signal from the RPM sensor. The GM-style sensor is identical to 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 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 up). They must be infinite ohms. 4. ECU The ECU in our 20vt turbo (3B AAN ABY ADU) engines requires to be aware of the position and speed of the crankshaft to make decisions regarding timing of fuel injectors, etc. It utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this. If you encounter a problem with either of these sensors, the diagnostic scanner will show codes that could cause an engine shutdown. Some of the symptoms of a failed G28 sensor are an inaccurate gearbox rev counter, gears shifting quicker than normal and/or misfiring when you are in gear. If you are experiencing any of these problems, it is most likely that your sensor is going bad and should be replaced. They're inexpensive and easy to locate especially if they're an Bosch model like ours. If you prefer, GM's version of this part is a good option. 5. Tachometer A malfunctioning engine sensor can cause a myriad of issues in your car. It is an important part of the transmission in your Audi since it sends information to the ECU regarding how fast or slow the engine of the car is turning. When this sensor fails, it can affect the performance of the transmission, as well as the other car's components. The G5 engine sensor is located at the outskirts of the transmission, over the flywheel ring. It sends signals via a gray wire to the ECU pin T55/49. The ECU uses this signal to control the amount of fuel and boost, and also timig. It also transmits it to the G5 Tachometer in instrument cluster. You can test the sensor for failure by checking continuity between it and the tachometer, between the 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. There should be the resistance to be around 1000 ohms between these points. This is a common feature across the Audi 80-100-200-RS2 model, ranging beginning with the 1985 MC and up to the 1997 UrS AN and 1995 RS2 DU, so you might find some good ones in wrecking yards.