dishdream5
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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor The sensor is located at the edge of transmission above the flywheel gear It sends a message to the ECU through a grey wire T5549 then to the tachometer in the instrument cluster 1 Engine Speed Sensor It is located on the outside of the transmission just above the flywheel ring gear G28 Engine Speed Sensor sends signals to ECU pin T5549 through the grey wire The ECU then utilizes this information to regulate fuel timig and boost It also sends an alert to the G5 Tachometer located in the instrument cluster The sensor serves as a reference for comparing 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 according to the situation If this sensor fails the ECU will throw an error code P00160 which indicates that the Crank Shaft and Intake Camshaft arent in sync and possibly indicating chain stretch or a jumped link on the upper chain of timing The code will not appear without the additional information provided by other sensors G4 or G40 Testing is a bit challenging because there are two pins for the connector and they have different functions however the best method of testing it is to measure resistance between the sensor and the ECU It should read about 1000 ohms when the sensor is at full operation If youre having issues with this sensor look for signs of coolant or oil in the connector bay 2 Injectors Yesterday while accelerating from the highway paytoll at full speed I noticed a massive reduction in power It was as if the engine had run out of gas Or my injectors werent firing I took out the spark plugs this morning and found that 3 were drenched in gasoline and 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 pop out but the 4th stay shut I checked the ground connection on ECU pins 145530554855145548 i get 0ohm Therefore i think the issue is elsewhere I also tried to reset the PID without success The car will start when the G28 is disconnected but it runs fine with the G28 plugged in However the intermittent misfire issue continues to occur at higher RPM The temperature sensor for coolant G62 shows the wrong temp value that is 49c even after unplugging it I also noticed that the gauge for oil pressure in the cockpit shows 2 bar whereas the actual pressure is 00 if i crank up the engine Im not sure what to do but i think ive pretty much ruled out everything else Im concerned that i may have missed something Please let me know If you have any suggestions TIA 3 Fuel Pump The fuel pump on the g28 is activated by a signal sent from the RPM sensor audi a3 replacement key style transmitter is the same as the G4 and they both work in the 80 100 200 UrS and RS2 cars so you can easily find one at a junkyard or from a parts store It is easy to test them simply put your DMM into resistance mode and determine the distance between pins 1 and 2 with the bump at the connector end facing upwards They should be infinite Ohms 4 ECU Our 20vt turbo 3B AAN ABY and ADU engines have an ECU that needs to be aware of the speed and position of the crankshaft to make a decision about timing of the fuel injector for example To do this it uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 If either of these goes wrong you will receive codes on the diagnostic scanner which could cause engine shut down Some of the symptoms of a failing G28 sensor are an inaccurate gearbox rev counter and gears that shift faster than normal andor misfiring when you are in gear It is likely that your sensor is failing and requires to be replaced if you notice any of these symptoms Theyre cheap and easy to find particularly when theyre an Bosch model like ours Alternatively GMs version of this part is a good option 5 Tachometer A faulty engine speed sensor could be a cause for many issues with your vehicle Its an essential component of the Audis transmission as it sends information to the ECU about how fast or slow the cars crankshaft is rotating When this sensor fails it could disrupt the performance of the transmission and the other cars components The G5 engine sensor is located at the outskirts of the transmission over the flywheel ring It transmits a signal via a gray wire to the ECU pin T5549 The ECU is then able to process this signal to control fuel timig and boost as well as sends it on to the G5 Tachometer located in the instrument cluster You can check for sensor failure by checking continuity from the sensor to the tachometer You can also verify continuity between pin T5549 of the ECU and pin T6a1 of the instrument cluster trace 79 and between pin T6a1 as well as pin T26a12 There should be an average resistance of 1000 ohms between these two points This is the same across the Audi 80100200RS2 series starting from the 1985 MC up to the 1997 UrS AN and 1995 RS2 DU so you might find them in wrecking yards