The 12 Most Unpleasant Types Of Audi G28 Tweets You Follow
The 12 Most Unpleasant Types Of Audi G28 Tweets You Follow
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How to Replace an Audi G28 Engine Speed Sensor
Charles the Humble Technician teaches you how to replace the G28 Engine Speed Sensor. The sensor is situated at the top of the transmission above the flywheel ring gear. It sends a message to the ECU through an uncolored wire T55/49, then to the tachometer on the instrument cluster.
1. Engine Speed Sensor
The grey wire is located at the edges of the transmission, directly above the flywheel ring. This sensor sends an electrical signal through the grey wire to pin T55/49. The ECU utilizes this information to regulate fuel and boost. It also sends an indication to the G5 Tachometer located in the instrument cluster.
The sensor is used to correlate the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft reached TDC and also the position of the camshaft, so that it can activate the spark and injectors.
If this sensor fails when it fails, the ECU will display a P00160 error message. This indicates that the Crank Shaft is not in line 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. The code won't show without the additional information supplied by other sensors (G4 or G40).
It is a little tricky to test as there are several connector pins, and each has its own functions. The most effective method to test it is by measuring the resistance between the ECU and the sensor. It should read around 1000 ohms when the sensor is at full operation. 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 like the engine was running out of gas. Or my injectors weren't firing. I took out the spark plugs this morning, three were drenched in gasoline and the fourth was dry. When i crank the engine, there are no sparks i put tissue on the top of each hole in the injector and the 3 drenched with gazoline pop out, but the 4th one stays closed. I checked the ground connection of ECU pins 14,30, and 48/55. I got zero ohm. I'm assuming the issue is somewhere else.
I also tried to reset PID but without success. The car is able to start when the G28 is unplugged and it runs perfectly when it is connected, but still has the intermittent misfire issue at higher RPM. The coolant sensor (G62), even if it is not plugged in, shows a temperature of -49c. Also, i noticed that the oil pressure gauge in the cockpit shows 2 bar while the actual pressure is 0.0 when I crank up the engine.
I don't know what to do. I think I've all other possibilities out. However, i'm afraid that I might have missed something. If anyone has any suggestions, please share them! TIA!
3. Fuel Pump
The fuel pump in the g28 receives signals from the RPM sensor. The GM-style sensor is the same as the G4 and both are used in the 80, 100, 200, UrS and RS2 cars so you can easily find one at a salvage yard or from a parts store. It is simple to test them: simply switch your DMM into resistance get more info mode and determine 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 has to know the speed and position of the crankshaft in order to make decisions about fuel injector timing etc. To do this, it uses a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If you are experiencing issues with either one of these, the diagnostic scanner will show codes that could cause an engine shutdown.
A malfunctioning G28 sensor can cause an inaccurate speed counter for your here gearbox, a gearbox that shifts more quickly than normal, or a misfire while in gear. If you experience any of these issues it is most likely that your sensor is going bad and here requires replacement. The good thing is that they are very cheap and easily accessible particularly when you're looking at the Bosch unit which is what we have. Alternatively, the GM version of this component is also a good option.
5. Tachometer
A failing engine speed sensor could be the reason behind numerous issues with your car. It more info is a crucial part of your Audi's transmission, because it communicates to the ECU about how the car's crankshaft is rotating. If this sensor fails, it could cause problems for the transmission, as well as the other car's components.
The G5 engine speed sensor is located on the edge of the transmission above the here flywheel ring gear and sends a signal to the ECU at pin T55/49 via a grey wire. The ECU then uses and processes this signal to control fuel, timig and boost and then transmitting 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, between ECU pin T55/49 and the instrument cluster connection on pin T6a/1 (trace [79]) as well as between T6a/1, and the instrument cluster pin T26a/12. It should show around 1000 ohms of resistance between those points. This is a common component across the Audi 80, 100, 200, UrS and RS2 range from 1985 MC through the 1997 UrS AAN and 1995 RS2 ADU, so the best ones might be availble in wrecking yards.