"Ask Me Anything " 10 Responses To Your Questions About Audi G28

How to Replace an audi q3 Key G28 Engine Speed Sensor

In this video, Charles the Humble Mechanic shows how to replace audi key fob 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 through an uncolored wire T55/49, then to the tachometer 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 through an uncolored wire. The ECU then uses this information to control the flow of fuel, timig and boost. It also sends an alert to the G5 Tachometer within the instrument cluster.

The sensor is used to correlate the G40 Camshaft position Sensor. The ecu needs to be aware of when the crankshaft has reached TDC and also the position of the camshaft, audi a1 Key to trigger 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 sync with the Intake Camshaft. It could also be a sign of an issue with the chain or a jumpy chain link in the upper chain. However, the code won't be displayed on its own without additional information from other sensors (G4 and G40).

It can be a bit difficult to test as there are various pins on the connector and each has its own 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 be reading about 1000 ohms. Look for signs of coolant, or oil in the connector bay if you have issues with this part.

2. Injectors

Yesterday, as i was accelerating off the highway paytoll at maximum speed I noticed a massive reduction in power. It was as if the engine was running out of gas. Or my injectors were not firing. In the morning, i removed the spark plugs, three were drenched with gazoline the fourth one was dry. I put a piece of tissue over each hole in the injector and when i start the engine without sparks, the three with gazoline jump right out. The 4th one stays closed. I checked the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ I got zero ohm. Therefore, i think the issue is elsewhere.

I also tried to reset the PID with no success. The audi replacement car keys will start when the G28 is disconnected and runs fine when it is plugged in but it still is experiencing intermittent misfires at higher RPM. The temperature sensor for coolant (G62) shows the wrong temperature value of that is -49c even after unplugging it. I also noticed that the oil pressure gauge in the cockpit shows 2 bar, whereas the actual pressure is 0.0 when i rev the engine.

I'm not sure what to do. I feel like i've pretty much eliminated everything else. However, i'm afraid that i might have missed something. If anyone has any suggestions, please chime in! TIA!

3. Fuel Pump

The fuel pump in the g28 can be activated by a signal by the RPM sensor. The GM-style transmitter is identical to the G4 sender and works on the 80,100,200, UrS, and RS2 vehicles. It is easy to find an extra in a wrecking shop or parts store. It is easy to test them: simply put your DMM into resistance mode and measure the distance between pins 1 and 2 (with the bump at the connector end facing upwards). They should be infinite Ohms.

4. ECU

The ECU in our 20vt turbo (3B AAN ABY ADU) engines requires to know the speed and position of the crankshaft to determine timing of fuel injectors, etc. To do this, it uses a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these go wrong, you will receive codes on the diagnostic scanner that could cause engine shut down.

A damaged G28 sensor can cause an inaccurate speed counter for your gearbox or a gearbox that shifts faster than normal, or a misfire while in gear. If you are experiencing any of these issues it is likely that your sensor is going bad and should be replaced. They're cheap and easy to find particularly if they're an Bosch model like ours. If you prefer, GM's version of this part is a good option.

5. Tachometer

A failing engine speed sensor could be a cause for a slew of issues with your vehicle. It is an important part of the transmission in your audi car key replacement cost, as it transmits information to the ECU on how fast or slow the engine of the car is spinning. If the sensor fails, it could affect the performance of the transmission as well as the rest of the car's components.

The G5 engine speed sensor is situated on the edge of the transmission just above the flywheel ring gear. It transmits a signal to the ECU at pin T55/49 via an uncolored wire. The ECU utilizes this signal to regulate the amount of fuel and boost, as well as timig. It also transmits it to the G5 Tachometer inside the instrument cluster. You can test the sensor for failure by checking continuity between it and the tachometer, between the ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79]) as well as between T6a/1, and the instrument cluster pin T26a/12. You should detect the resistance to be around 1000 ohms between these points. This is a standard part across the audi car key replacement 80 100, 200, UrS and RS2 range from 1985 MC until the 1997 UrS AAN and 1995 RS2 ADU so good ones could be available in wrecking yards.