sudanquiver89
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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 situated at the top of the transmission above the flywheel ring gear It transmits a signal to the ECU via a grey wire T5549 then to the tachometer located on the instrument cluster 1 Engine Speed Sensor The grey wire is located on the edge of transmission just above the flywheel ring This sensor sends a signal via the grey wire to pin T5549 The ECU then utilizes this information to regulate fuel timig and boost It also sends an indication 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 reached TDC and also where the camshaft lies in order to activate the spark and injectors If this sensor fails the ECU will display the P00160 error which means the Crank Shaft and Intake Camshaft are not in sync and possibly indicating chain stretch or a jumped link on the upper timing chain The code will not appear without the additional information supplied by other sensors G4 or G40 Its a bit tricky to test since there are several 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 If the sensor is functional it should read about 1000 ohms Look for no title of coolant or oil in the connector bay if you have issues with this part 2 Injectors Yesterday when i was accelerating to the fullest speed from highway paytoll I experienced massive power loss like the engine is running out of gas or injectors arent firing anymore I took out the spark plugs this morning three were soaked in gasoline and the fourth was unclean I put tissue over each hole in the injector and when i turn the engine on without sparks the ones with gazoline jump right out The 4th one stays closed I tried to test the ground connections of ECU pins 1430 and 4855 I found 0ohm no title m assuming that the issue is in another location I also tried to reset PID but without success The car will start when the G28 is disconnected but it is running fine with the G28 plugged in However the intermittent misfire issue continues to occur at higher RPM The coolant temperature sensor G62 shows the wrong temperature value of 49c even if I unplug it I also noticed that the oil gauge in the cockpit shows 2 bars but the actual pressure is zero Im not sure what to do I feel like ive pretty much ruled everything else out Im afraid i may have missed something If anyone has any ideas please share them TIA 3 Fuel Pump The fuel pump on the g28 is activated by a signal from the RPM sensor The GMstyle sender is identical to the G4 and both function 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 by putting your DMM in resistance mode and measure the resistance between pins 1 with the bump on the connectors end up and 2 2nd from the left on the black end of the connector They should be infinite Ohms 4 ECU Our 20vt turbo 3B AAN ABY and ADU engines have an ECU that must be aware of the speed and position of the crankshaft in order to make decisions about timing of the fuel injector for example In order to do this it makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 If either of these sensors go wrong you will receive codes on the diagnostic scanner that could cause engine shut down A damaged G28 sensor could result in an inaccurate speed counter for your gearbox or a gearbox that shifts faster than normal or a misfire in gear If you have any of these problems it is likely your sensor is deteriorating and requires replacement The good news is that they are quite affordable and readily available especially if youre looking at the Bosch sensor which is what we have Alternatively the GM version of this part is also a good choice 5 Tachometer A malfunctioning engine speed sensor could be the reason behind many problems in your vehicle Its an essential component of your Audis transmission since it relays information to the ECU about how the cars crankshaft is turning When this sensor fails it could affect the performance of the transmission as well as the rest of the cars components The G5 engine sensor is located at the outskirts of the transmission just above the flywheel ring It sends a signal via an uncolored wire to the ECU pin T5549 The ECU is then able to process this signal to regulate fuel timig and boost and then transmitting it to the G5 tachometer inside the instrument cluster You can determine if the sensor is in failure by examining the continuity from the sensor to the tachometer You can also check continuity between pin T5549 of the ECU and pin T6a1 of the instrument cluster trace 79 and between pin T6a1 and pin T26a12 You should observe approximately 1000 ohms of resistance between those two pins This is the same across the Audi 80100200RS2 model ranging from the 1985 MC up to the 1997 UrS AN and 1995 RS2 Du so you might find them in wrecking yards
