The Biggest "Myths" Concerning Audi G28 Might Be True

How to Replace an audi a3 spare key G28 Engine Speed Sensor

Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor. This sensor is located at the edge of transmission over the flywheel gear. It transmits a signal the ECU via the grey wire (T55/49) which is then sent to the tachometer located in the instrument cluster.

1. Engine Speed Sensor

Located on the edge of the transmission above the flywheel ring gear G28 Engine Speed Sensor sends signals to ECU pin T55/49 via the grey wire. The ECU utilizes this information to regulate boost and fuel. 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 has to know when the crankshaft reached TDC, and where the camshaft lies in order to activate the spark and injectors.

If this sensor fails when it fails, the ECU will display a P00160 error code. This means that the Crank Shaft is out of line with the Intake Camshaft. It could also indicate an issue with the chain or a jumped chain link in the upper chain. However the code will not appear on its own, without additional information from other sensors (G4 and G40).

It can be a bit difficult 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. When the sensor is fully operational, it should read about 1000 ohms. If you're experiencing issues with this sensor, look for signs of coolant or cost of audi keys replacement key replacement audi car key (https://yoursocialpeople.com/story3439230/this-Is-how-spare-audi-key-will-look-like-in-10-years-time) 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 weren't firing. I pulled out the spark plugs this morning, 3 were soaked in gasoline, and the 4th was dry. I put a piece of tissue over each hole in the injector and when i turn the engine on without sparks, the 3 with gazoline jump out. The 4th one remains shut. I checked the ground connection of ECU pins 14,30 and 48/55. I found 0ohm. I assume that the problem is elsewhere.

I also tried to reset the PID without success. The car will start if the G28 is not plugged in and it runs perfectly when it is plugged in but it still has the intermittent misfire issue at higher RPM. The temperature sensor for the coolant (G62) shows the wrong temp value -49c, even if 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 when I crank up the engine.

I'm not sure what to do, i think i've pretty much eliminated everything else. But i'm worried that i might 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 GM-style transmitter 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 salvage yard or from a parts store. Test them out - put your DMM in resistance mode and measure between pins 1 (with the bump on the connector's end up) and 2 (2nd from left on the black connector's end). They should 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 to make decisions regarding timing of the fuel injector, for example. It makes use of a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If you encounter a problem with either of these, the diagnostic scanner will show codes that could lead to an engine shutdown.

Some of the signs of a malfunctioning G28 sensor include an inaccurate gearbox rev counter the gears are shifting faster than normal and/or a misfire when you are in gear. If you experience any of these issues, it is likely that your sensor is failing and should be replaced. They're cheap and easy to find, especially when they're a Bosch model like ours. Alternately, the GM version of this unit is also a good option.

5. Tachometer

A faulty engine speed sensor could be the cause of a slew of problems in your vehicle. It is an important part of the transmission in your audi replacement key cost uk, as it transmits information to the ECU on how fast or slowly the car's engine is spinning. This sensor can cause the transmission to malfunction and other components in the car to be affected.

The G5 engine sensor is located near the edge of transmission, above the flywheel ring. It sends signals via an uncolored wire to the ECU pin T55/49. The ECU utilizes this signal to regulate the flow of fuel and boost and also to timigrate. It also transmits it to the G5 Tachometer located in the instrument cluster. You can check for sensor failure by examining the continuity of the sensor to the tachometer. Also, you can verify continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79trace [79]) and between pin T6a/1 as well as pin T26a/12. You should observe approximately 1000 ohms of resistance between those two pins. This part is common across the audi replacement key fob 80-100-200-RS2 model, ranging from the 1985 MC up to the 1997 UrS AN and 1995 RS2 DU, so you might find some good ones in wrecking yards.