The Most Prevalent Issues In Audi G28
The Most Prevalent Issues In Audi G28
Blog Article
How to Replace an Audi G28 Engine Speed Sensor
Charles the Humble Technician shows you how to replace the G28 Engine Speed Sensor. The sensor is located near the edges of the transmission, above the flywheel ring gear. It sends a message to the ECU via an uncolored 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 the G28 Engine Speed Sensor sends a signal 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 a signal to the G5 tachometer inside the instrument cluster.
The sensor is used to connect 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 to trigger the spark and injectors.
If this sensor fails the ECU will throw the P00160 error, which means the Crank Shaft and Intake Camshaft aren't in sync, possibly indicating the chain stretching or a jump link on 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 as there are different pins on the connector, and they all have different functions. The best way to do it is by measuring the resistance between the ECU and the sensor. It should read about 1000 ohms when it is at full operation. Check for signs of coolant, or oil in the connector bay if there are issues with this component.
2. Injectors
Yesterday, when i was accelerating to the fullest speed from highway paytoll i had massive power loss like the engine is out of gas or injectors aren't firing anymore. I took out the spark plugs this morning, 3 were soaked in gasoline, and the fourth was unclean. I put tissue over each hole in the injector and when i start the engine without sparks, the ones with gazoline jump right out. The fourth one remains closed. I tested the ground connection on ECU pins 14/55, 30/55 and 48/55. I get zero ohm. I assume that the problem is elsewhere.
I also tried to reset PID but without success. The car can start if the G28 is disconnected and is running fine when it is connected, but still has the intermittent misfire issue at higher RPM. The coolant sensor (G62) even when it is unplugged, shows temperatures of -49c. Also, i noticed that the oil pressure gauge in the cockpit shows 2 bar, whereas the audi lost key replacement actual pressure is 0.0 when I crank up the engine.
I'm not certain what to do, i believe that i've ruled out everything else. However, i'm afraid that I may have missed something. If anyone has suggestions, please chime in! TIA!
3. Fuel Pump
The fuel pump on the g28 is activated by a signal sent from the RPM sensor. The GM-style sensor is identical to the G4 and they both audi key replacement work in the 80, 100, 200, UrS and RS2 cars which is why you can easily locate one at a salvage yard or at a parts store. It is simple to test them - just put your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump on the connector's edge facing up). They must be infinite Ohms.
4. ECU
The ECU in our 20vt turbo (3B AAN ABY ADU) engines requires to be aware of the position and speed the crankshaft to determine timing of the fuel injector, etc. To accomplish this, it utilizes a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these goes bad get more info you will get codes on the diagnostic scanner that can cause the engine to shut down.
Some of the symptoms of click here a failing G28 sensor are an inaccurate rev counter in the gearbox and gears that shift faster than normal and/or a misfire when in gear. It is likely that your sensor is failing and needs to be replaced if you experience any of these signs. They are cheap and easy-to-find, especially in the case of an Bosch unit like ours. Alternatively, GM's version of this part is an option.
5. Tachometer
A failing engine speed sensor could be a cause for numerous issues in your car. It's an essential component of the transmission of your Audi because it relays information to the ECU regarding how fast or slowly the engine is spinning. If this sensor fails, it will affect the performance of audi key replacement near me the transmission, as well as the rest of the car's components.
The G5 engine sensor is located at the outskirts of the transmission, over the flywheel ring. It sends an electrical signal through gray wire to ECU pin T55/49. The ECU is then able to process the signal to control fuel, timig and boost, and also transmitting it to the G5 tachometer in the instrument cluster. You can test for sensor failure by checking continuity from the sensor to the tachometer. Also, you can verify continuity between pin 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 these two points. This is a common part across the Audi 80 100, 200, UrS and RS2 range from 1985 MC to the 1997 UrS AAN and 1995 RS2 ADU so good ones could be available in wrecking yards.