The Ultimate Cheat Sheet On Audi G28
The Ultimate Cheat Sheet On Audi G28
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How to Replace an Audi G28 Engine Speed Sensor
Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor. This sensor is located on the outside of the transmission, above the flywheel gear. It sends a message to the ECU via a grey wire T55/49, then to the tachometer in the instrument cluster.
1. Engine Speed Sensor
The grey wire is situated on the outside of the transmission, just above the flywheel ring. The sensor sends a signal via the grey wire to pin T55/49. The ECU uses this information to control boost and fuel. It also sends a signal to the G5 tachometer in the instrument cluster.
The sensor is used to connect with the G40 Camshaft position Sensor. The ecu must know when the crankshaft reached TDC and also where the camshaft lies so that it can activate the spark and injectors.
If this sensor fails to function, the ECU will display a P00160 error message. This means 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. However the code will not appear on its own, without additional information from other sensors (G4 and G40).
Testing is a bit tricky since there are two connector pins, and they have different functions but the most effective method of testing it is to measure resistance between the sensor and the ECU. When the sensor is functional, it should read around 1000 ohms. If you're experiencing issues with this sensor, look for signs of coolant or oil in the connector bay.
2. Injectors
Yesterday, when i was accelerating to the fullest speed from highway paytoll, i experienced massive power loss as if the engine was running out of gas or injectors aren't firing anymore. I took out the spark plugs this morning, 3 were soaked with gasoline and the 4th was dry. When i crank the engine, there are no sparks, i place a tissue on the top of each of the injector holes, the 3 drenched with gazoline pop out, but the 4th stays shut. I checked the ground connection on ECU pins 14/55,30/55 and 48/55 I get zero ohm. So i assume the problem is in another place.
I also tried to reset the PID without success. The car can start if the G28 is unplugged and runs fine when it is connected but it still has the intermittent misfire issue at higher RPM. The coolant temperature sensor (G62) shows the wrong temperature of -49c, even if I unplug it. Also, i noticed that the oil pressure gauge in the cockpit shows 2 bar, whereas click here the actual pressure is 0.0 if i crank up the engine.
I don't know what to do. I believe that I've eliminated everything else. I'm worried that i might have missed something. If anyone has any ideas please share them! TIA!
3. Fuel Pump
The fuel pump of the g28 receives signals audi car key from the RPM sensor. The GM-style transmitter functions similarly to the G4 sender and both work on the 80,100,200, UrS, replacement audi car key and RS2 vehicles. You can easily 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 must be infinite ohms.
4. ECU
Our 20vt turbo (3B AAN, ABY, and ADU) engines have an ECU that needs to know the position and speed of the crankshaft to make decisions about fuel injector timing etc. It uses a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If either of these goes badly, you will see codes on the diagnostic scanner that can cause the engine to shut down.
A failing G28 sensor could cause an inaccurate gearbox speed counter and a gearbox which audi car keys replacement shifts faster than normal, and/or an unfire when in the gear. If you have any of these problems, it is most likely that your sensor is going bad and needs replacing. They're inexpensive and easy to locate particularly when they're an Bosch model like ours. Alternatively, GM's version of this component is a good option.
5. Tachometer
A failing engine sensor could cause a number of problems in your vehicle. It's a vital component of your Audi's transmission, because it communicates to the ECU about how the car's crankshaft is spinning. When this sensor fails, it will cause problems for 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 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 control fuel and boost, and also to timigrate. It also relays it to the G5 Tachometer inside the instrument cluster. You can check 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 to pin T6a/1 (trace [79trace [79]) and between T6a/1 and the instrument cluster pin T26a/12. You should observe approximately 1000 ohms resistance between these two points. This is a standard component across the Audi 80 100, 200, UrS and RS2 range from 1985 MC until the 1997 UrS AAN and 1995 RS2 ADU. Good ones could be available in audi a1 keys wrecking yards.