Begin By Meeting The Steve Jobs Of The Audi G28 Industry
Begin By Meeting The Steve Jobs Of The Audi G28 Industry
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How to Replace an Audi G28 Engine Speed Sensor
In this video, Charles the Humble Mechanic demonstrates how to replace the G28 engine speed sensor. The sensor is located on the outside of the transmission just above the flywheel gear. It transmits a signal to the ECU via the grey 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 G28 Engine Speed Sensor sends signals to ECU pin T55/49 using an uncolored wire. The ECU then utilizes this information to regulate the boost, fuel, and timig. It also sends an alert to the G5 Tachometer in instrument cluster.
The sensor is used to connect the G40 Camshaft position Sensor. The ecu must be aware when the crankshaft is TDC and the location of the camshaft so it can trigger spark and injectors accordingly.
If this sensor fails to function, the ECU will display a P00160 error code. This indicates that the Crank Shaft is out of alignment with the Intake Camshaft. It could also be a sign of an issue with the chain or a jump in the chain link of the upper chain of timing. However the code will not be displayed on its own without additional information from other sensors (G4 and G40).
It is a little tricky to test since there are different connector pins, and each one has different functions. The best way to do it is to measure the resistance between the ECU and the sensor. When the sensor is fully operational, it should read about 1000 ohms. If you're having issues with this part, check for evidence of coolant or oil in the connector bay.
2. Injectors
Yesterday, when accelerating from highway paytoll at a high speed, i noticed a huge reduction in power. It was as if the engine was running out of gas. Or, my injectors were not firing. I pulled out the spark plugs this morning and found that 3 were soaked with gasoline and the 4th was dry. I placed a tissue over each injector hole and when I turn the engine on without sparks, the ones with gazoline jump out. The 4th one remains shut. I tested the ground connection on ECU pins 14/55,30/55 and 48/55 i get zero ohm. I'm assuming that the issue is in another location.
I also tried to reset the PID without success. The car can start when the G28 is disconnected and is running fine when it is connected but it still has intermittent misfire issues 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 while the actual pressure is 0.
I'm not sure what to do, but i feel i have pretty much ruled out everything else. I'm worried that i might have missed something. replacement key for audi a3 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 simple to test them - simply put your DMM into resistance mode and determine the distance between pins 1 and 2 (with the bump at the connector end facing up). They must be infinite Ohms.
4. ECU
Our 20vt turbo (3B AAN, ABY, and ADU) engines are equipped with an ECU that needs to be aware of the speed and position of the crankshaft to make decisions about timing of the fuel injectors, etc. In order to do this it uses a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these goes bad you will get codes on the diagnostic scanner that can lead to engine shutdown.
A malfunctioning G28 sensor could cause an inaccurate speed counter for your gearbox and a gearbox which shifts more quickly than normal, audi a3 key replacement near me or an unfire when in gear. It is likely that the sensor is failing and requires to be replaced if you encounter any of these signs. The good news is that they are quite affordable and easy to find particularly in the case of a Bosch model, which is what we have. Alternatively, the GM version of this unit is also a great option.
5. Tachometer
A malfunctioning engine sensor can cause a number of problems in your vehicle. It is an important part of the transmission of your Audi because it relays information to the ECU regarding how fast or slowly the engine of the car is spinning. When this sensor fails, it will affect the performance of the transmission and the other car's components.
The G5 engine sensor is located at the outskirts of the transmission, over the flywheel ring. It sends signals via an uncolored wire to the ECU pin T55/49. The ECU then processes this signal to regulate fuel, timig, and boost as well as transmitting it to the G5 tachometer in the instrument check here cluster. You can test the sensor for failure by examining the continuity between it and the tachometer. You can also check continuity between ECU pin T55/49 and the instrument cluster connection on pin read more T6a/1 (trace [79trace [79]) and between T6a/1 and the instrument cluster pin T26a/12. You should detect a resistance of approximately 1000 ohms between these two points. This is a standard component across the Audi 80 100, 200, UrS get more info and RS2 range from 1985 MC until the 1997 UrS AAN and 1995 RS2 ADU. Good ones might be availble in wrecking yards.