How to Replace an audi tt replacement key G28 Engine Speed Sensor

In this video Charles the humble mechanic demonstrates how to replace the G28 engine speed sensor. This sensor is situated at the edge of transmission, above the flywheel gear. It transmits a signal to the ECU via an uncolored wire (T55/49), then to the tachometer located in the instrument cluster.

1. Engine Speed Sensor

Located on the edge of the transmission above the flywheel ring gear, the G28 Engine Speed Sensor sends an electrical signal to ECU pin T55/49 using the grey wire. The ECU utilizes this information to regulate the amount of fuel and boost. It also sends an alert to the G5 Tachometer in instrument cluster.

The sensor is used to correlate the G40 Camshaft position Sensor. The ecu has to know when the crankshaft has reached TDC, and where the camshaft lies so that it can activate the spark and injectors.

If this sensor fails, the ECU will display a P00160 error message. This means that the Crank Shaft is not in alignment with the Intake Camshaft. It could also be a sign of the possibility of a chain stretch or jumped chain link in the upper chain. However the code will not be displayed on its own without additional information from other sensors (G4 and G40).

Testing is a bit challenging because there are two connector pins, and they have different functions but the most effective way to test it is by measuring resistance between the sensor and the ECU. When the sensor is operational, it should read around 1000 ohms. Look for signs 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 had a big cut in power like the engine is out of gas or the injectors aren’t firing any more. I pulled out the spark plugs this morning and found that 3 were drenched in gasoline and the 4th was dry. When I crank the engine without sparks, I put a piece of tissue on the top of each of the injector holes and the 3 that were drenched in gazoline jump out but the 4th stays closed. I tested the ground connection on ECU pins 14/55, 30/55 and 48/55. i get 0ohm. I’m assuming the issue is somewhere else.

I also tried to reset PID but without success. The car can start when the G28 is not plugged in and it runs perfectly when it is connected, but still is experiencing intermittent misfires at higher RPM. The temperature sensor for the coolant (G62) shows the wrong temperature of -49c, even if I unplug it. I also noticed that the oil gauge in the cockpit shows 2 bars while the actual pressure is 0.

I don’t know what to do. I think I’ve all other possibilities out. But i am afraid I may have missed something. Let me know should you have any suggestions! TIA!

3. Fuel Pump

The fuel pump in the g28 receives signals from the RPM sensor. The GM-style transmitter is similar to the G4 sender, and both operate on the 80,100,200, UrS, and RS2 vehicles. It is easy to find a spare in a wrecking shop or a parts store. It is simple to test them – just switch your DMM into resistance mode and measure the distance between pins 1 and 2 (with the bump on the connector’s edge facing up). They must be infinite ohms.

4. ECU

The ECU of our 20vt turbo (3B AAN ABY ADU) engines must know both the position and speed the crankshaft in order to make a decision about fuel injector timing, etc. It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to achieve this. If you are experiencing issues with either one of these, the diagnostic scanner will show the codes that could trigger an engine shutdown.

A damaged G28 sensor could cause an inaccurate speed counter for your gearbox, a gearbox that shifts more quickly than normal, or an unfire when in the gear. If you experience any of these issues, it is likely that your sensor is failing and needs replacing. The good news is they are quite affordable and easy to find, especially in the case of a Bosch model, like ours. Alternatively, the GM version of this component is also a great option.

5. Tachometer

A malfunctioning engine speed sensor could be the reason behind a slew of problems in your vehicle. It’s an essential component of the audi remote key‘s transmission because it communicates to the ECU about how the car’s crankshaft is turning. This sensor could cause the transmission to fail and other car components to be affected.

The G5 engine speed sensor is situated on the edge of the transmission above the flywheel ring gear. It transmits a signal to the ECU at pin T55/49 through a grey wire. The ECU uses this signal to regulate fuel and boost, and also to timigrate. It also transmits it to the G5 Tachometer located in the instrument cluster. You can check the sensor for failure by checking continuity between it and the tachometer, between ECU pin T55/49 and the instrument cluster connection on pin T6a/1 (trace [79]) as well as between T6a/1, and the instrument cluster pin T26a/12. You should see a resistance of approximately 1000 ohms in these areas. This is a standard component across the audi keyless go replacement key cost Uk (http://Www.hulkshare.com) 80, 100, 200, UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU, so the best parts could be found in wrecking yards.