Its History Of Audi G28

How to Replace an audi keyless go G28 Engine Speed Sensor

Charles the Humble Technician teaches how to replace audi key the G28 Engine Speed Sensor. This sensor is located near the edges of the transmission, above the flywheel ring gear. It transmits a signal to the ECU through an uncolored wire T55/49, then to the tachometer located on the instrument cluster.

1. Engine Speed Sensor

It is located on the outside of the transmission, above the flywheel ring gear, the G28 Engine Speed Sensor sends a signal to ECU pin T55/49 using a grey wire. The ECU utilizes this information to regulate fuel and boost. It also sends an indication to the G5 Tachometer within the instrument cluster.

The sensor is used to connect with the G40 Camshaft position Sensor. The ecu must know when the crankshaft is TDC and the location of the camshaft so it can trigger spark and injectors in the right way.

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

Testing is a bit challenging as there are two different connector pins and they perform different functions however the best method to test it is by measuring resistance between the sensor and the ECU. It should read approximately 1000 ohms when the sensor is in full operation. If you are having problems with this component, look for signs of coolant or oil 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 running out of gas or the injectors are not firing at all. I pulled out the spark plugs this morning, three were soaked 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 hole in the injector and the 3 that were drenched in gazoline pop out, but the 4th stays shut. I checked the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ I got zero Ohm. I'm assuming the issue is in another place.

I also tried to reset the PID but with no luck. The car can start when the G28 is disconnected and is running fine when it is plugged in but it still has the intermittent misfire issue at higher RPM. The coolant sensor (G62) even when it is unplugged, shows temperatures of -49c. I also noticed that the oil gauge in the cockpit shows 2 bar when the actual pressure is 0.

I'm not sure what to do, i feel i have pretty much ruled out everything else. I'm afraid i may have missed something. Please let me know if you have any ideas! TIA!

3. Fuel Pump

The fuel pump of the g28 gets a signal from the RPM sensor. The GM-style transmitter is the same as 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 wrecking yard or at a parts store. It is easy to test them - simply switch your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump at the connector's end facing upwards). They should be infinite Ohms.

4. ECU

The ECU of our 20vt turbo (3B AAN ABY ADU) engines requires to know the position and speed the crankshaft in order to make a decision about timing of the fuel injector, etc. To accomplish this, it utilizes a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you encounter a problem with either of these, the diagnostic scanner will show codes that could cause the engine shutting down.

A damaged G28 sensor can cause an inaccurate speed counter for your gearbox and a gearbox which shifts more quickly than normal, or a misfire in gear. It is possible that the sensor is failing and requires to be replaced if you notice any of these signs. They're inexpensive and easy to locate, especially in the case of an Bosch sensor like ours. Alternatively, GM's version of this part would be a good option.

5. Tachometer

A malfunctioning engine speed sensor could be the cause of a slew of issues with your vehicle. It's a crucial component of the transmission of your audi a4 key replacement remote key (a cool way to improve), as it transmits information to the ECU regarding how fast or slow the car's engine is turning. If this sensor fails, it can disrupt the performance of the transmission as well as the other car's components.

The G5 engine speed sensor is located at the edge of the transmission just above the flywheel ring gear. It sends a signal directly to the ECU at pin T55/49 through an uncolored wire. The ECU uses this signal to control fuel and boost, as well as timig. It also relays it to the G5 Tachometer inside the instrument cluster. You can determine if the sensor is in failure by checking continuity from the sensor to the tachometer. Additionally, you can examine the continuity between pins T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79]) and between pin T6a/1 and pin T26a/12. You should see around 1000 ohms of resistance between those two pins. This is a common part that is found across the audi car key cover 80 100, 200, UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU. Good ones might be availble in wrecking yards.