Begin By Meeting Your Fellow Audi G28 Enthusiasts. Steve Jobs Of The Audi G28 Industry
Begin By Meeting Your Fellow Audi G28 Enthusiasts. Steve Jobs Of The Audi G28 Industry
Blog Article
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 just above the flywheel ring gear. It sends a message to the ECU through a grey wire T55/49, then to the tachometer in the instrument cluster.
1. Engine Speed Sensor
It is located on the outside of the transmission just above the flywheel ring gear the G28 Engine Speed Sensor sends an electrical signal to ECU pin T55/49 using a grey wire. The ECU utilizes this information to control the amount of fuel and boost. It also sends signals to the G5 tachometer in the instrument cluster.
The sensor serves as a reference to correlate with the G40 Camshaft Position Sensor. The ecu has to be aware of when the crankshaft has reached TDC and also the location of the camshaft in order to activate the spark and injectors.
If this sensor fails when it fails, the ECU will display a P00160 error message. This means that the Crank Shaft is out of sync with the Intake Camshaft. It could also indicate a chain stretch or a jumped chain link in the upper chain of timing. The code won't appear without the additional information provided by other sensors (G4 or G40).
It's a bit tricky to test since there are various pins on the connector and each one has different functions. The best way to do it is by measuring the resistance between the ECU and the sensor. It should read approximately 1000 ohms if the sensor is operating at its maximum. Look for signs of coolant or oil in the connector bay if there are issues with this component.
2. Injectors
Yesterday, when accelerating from highway paytoll at maximum speed I noticed a massive drop in power. It was as if the engine had run 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. When I start the engine without sparks i put tissue on the top of each of the injector holes and the 3 that were drenched in gazoline jump out but the 4th one stays shut. I checked the ground connection of ECU pins 14,30 and 48/55. I got zero ohm. Therefore, i think the issue is somewhere else.
I also tried to reset PID but without success. The car can start when the G28 is not plugged in and it runs perfectly when it is plugged in however it has the intermittent misfire issue at higher RPM. The temperature sensor for the coolant (G62) shows the wrong temperature of -49c even when i unplug it. I also noticed that the oil pressure gauge in the cockpit is showing 2 bar while the actual website pressure is 0.0 when i rev the engine.
I'm not sure what to do. I feel check here like i've pretty much eliminated everything else. I'm worried that i might have missed something. If anyone has any suggestions, please chime in! TIA!
3. Fuel Pump
The fuel pump in the g28 is activated by a signal sent from the get more info RPM sensor. The GM-style transmitter functions similarly to the G4 sender, and both operate on the 80,100,200, UrS, and RS2 vehicles. You can easily find an extra in a wrecking shop or parts store. Test them out - put your DMM in resistance mode and measure the resistance between pins 1 (with the bump on the connector end up) and 2 (2nd from left on the black connector's side). 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 timing of the fuel injector, for example. In order to do this it makes use of a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these sensors go bad you will get codes on the diagnostic scanner which can lead to engine shutdown.
Some of the signs of a failed G28 sensor are an inaccurate rev counter for the gearbox the gears are shifting faster than normal and/or a misfire when you are in gear. If you are experiencing any of these problems, it is most likely that your sensor is going bad and requires replacement. They are cheap and easy-to-find particularly when they're an Bosch unit like ours. Alternately, the GM version of this component is also a good option.
5. Tachometer
A malfunctioning engine sensor can cause a variety of issues in your car. It's a crucial component of the transmission of your Audi, as it transmits information to the ECU about how fast or slow the car's engine is turning. If the sensor fails, it will disrupt the performance of the transmission as well as the other car's components.
The G5 engine sensor is located near the edge of the transmission, just above the flywheel ring. It sends signals via gray wire to ECU pin T55/49. The ECU is then able to process this signal to control fuel, timig and boost, and also sends it on to the G5 Tachometer located read more in the instrument cluster. You can check for sensor 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 observe approximately 1000 ohms of resistance between these two points. This is the same across the Audi 80-100-200-RS2 series, starting from the 1985 audi a3 key replacement MC up to the 1997 UrS An and 1995 RS2 Du So, you may find them in wrecking yards.