celerybronze89
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How to Replace an Audi G28 Engine Speed Sensor Charles the Humble Technician shows you how to replace the G28 Engine Speed Sensor The sensor is situated on the edge of the transmission above the flywheel ring gear It transmits a signal the ECU via the grey wire T5549 and then to the tachometer in the instrument cluster 1 Engine Speed Sensor The grey wire is situated on the outside of the transmission above the flywheel ring This sensor sends a signal via the grey wire to pin T5549 The ECU then utilizes this information to regulate the boost fuel and timig It also sends an indication to the G5 Tachometer located in the instrument cluster The sensor is used as a reference for comparing with the G40 Camshaft Position Sensor The ecu has to be aware of when the crankshaft has reached TDC and also the location of the camshaft so that it can activate the spark and injectors If this sensor fails the ECU will display a P00160 error code This means that the Crank Shaft is out of sync with the Intake Camshaft audi car keys replacement could also indicate an issue with the chain or a jumped chain link in the upper timing chain The code wont show without the additional information supplied by other sensors G4 or G40 It is a little tricky to test as there are various pins on the connector and they all have different functions The best method for doing this is by measuring the resistance between the ECU and the sensor When the sensor is fully operational it should read about 1000 ohms If you are having problems with this part check for evidence of oil or coolant in the connector bay 2 Injectors Yesterday while accelerating at full speed from the highway paytoll i had massive power loss like the engine is out of gas or the injectors are not firing anymore I took out the spark plugs this morning and found that 3 were soaked with gasoline and the fourth was unclean I put tissue over each injector hole and when i start the engine with no sparks the ones that have gazoline pop right out The 4th one remains shut I tried to test the ground connections of ECU pins 1430 and 4855 I found 0ohm I assume that the problem is in another location I also tried to reset the PID without success The car is able to start when the G28 is disconnected and is running fine when it is plugged in but still has intermittent misfire issues at higher RPM The coolant sensor G62 even if it is not plugged in shows a temperature of 49c I also noticed that the oil gauge in the cockpit shows 2 bar but the actual pressure is 0 Im not sure what to do i think ive pretty much completely ruled out all other possibilities Im concerned that i may have missed something Please let me know if you have any ideas TIA 3 Fuel Pump The fuel pump of the g28 receives signals from the RPM sensor The GMstyle transmitter is similar to the G4 sender and both operate on the 80100200 UrS and RS2 vehicles You can easily locate an extra in a wrecking shop or parts store Testing them is easy to do just put your DMM in resistance mode and measure the resistance between pins 1 with the bump on the connectors end up and 2 2nd from left on the black connectors end audi keys must be infinite Ohms 4 ECU Our 20vt turbo 3B AAN ABY and ADU engines are equipped with an ECU that must know the position and speed of the crankshaft in order to make decisions about timing of the fuel injectors etc It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this If you have a problem with either of these the diagnostic scanner will display the codes that could trigger an engine shut down A malfunctioning G28 sensor could result in an inaccurate speed counter for your gearbox a gearbox that shifts more quickly than normal or a misfire while in the gear If you experience any of these issues it is likely that your sensor is going bad and needs replacing They are cheap and easytofind particularly when theyre an Bosch unit like ours If you prefer GMs version of this component is a good option 5 Tachometer A failing engine speed sensor could be a cause for a slew of problems in your car It is a crucial part of the Audis transmission since it relays information to the ECU about how fast or slow the vehicles crankshaft is spinning If the 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 near the edge of transmission above the flywheel ring It transmits signals via an uncolored wire to the ECU pin T5549 The ECU then uses and processes this signal to regulate fuel timig and boost as well as sends it on to the G5 tachometer inside the instrument cluster You can check the sensor for any failure by checking the continuity between it and the tachometer You can also check continuity between ECU pin T5549 and the instrument cluster connection via pin T6a1 trace 79trace 79 as well as between T6a1 and the instrument cluster pin T26a12 You should see an average resistance of 1000 ohms between these points This is a common feature across the Audi 80100200RS2 series starting from the 1985 MC all the way up to the 1997 UrS AN and the 1995 RS2 Du So you may find good ones in wrecking yards