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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. The sensor is located at the edge of transmission over the flywheel gear. It transmits a signal to the ECU via a grey wire T55/49, then to the tachometer located on the instrument cluster.
1. Engine Speed Sensor
It is located on the outside of the transmission just above the flywheel ring gear G28 Engine Speed Sensor sends a signal to ECU pin T55/49 through a grey wire. The ECU uses this information to regulate boost and fuel. It also sends an indicator to the G5 Tachometer located in the 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 activate spark and injectors in the right way.
If this sensor fails when it fails, 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 indicate a chain stretch or a jump in the chain link of the upper chain. The code won't appear without the additional information supplied by other sensors (G4 or G40).
It can be a bit difficult to test because there are different connector pins, and each one has different functions. The best way to do it is by measuring the resistance between the ECU and the sensor. When the sensor is fully operational, it should be reading approximately 1000 ohms. If you're experiencing issues with this component, look for evidence of oil or coolant in the connector bay.
2. Injectors
Yesterday, while accelerating at full speed from the highway paytoll i had massive power loss like the engine is out of gas or the injectors aren't firing anymore. Today, i pulled out the spark plugs. Three were soaked with gazoline and the fourth was dry. I put a piece of tissue over each injector hole and when i turn the engine on without sparks, the three with gazoline jump right out. The fourth one remains closed. I inspected the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ I get 0ohm. So i assume the problem is in another place.
I also tried to reset the PID without success. The car will start when the G28 is disconnected, but it is running fine with the G28 connected. However the intermittent misfire issue continues to occur at higher RPM. The temperature sensor for coolant (G62) shows the wrong temp value that is -49c even after unplugging it. 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 completely ruled out all other possibilities. I'm worried that i might have missed something. Let me know should you have any suggestions! 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 which is why you can easily locate one at a wrecking yard or at a parts store. It is simple to test them: simply switch your DMM into resistance mode and determine the distance between pins 1 and 2 (with the bump at the connector audi tt key fob not working end facing up). They should be infinite ohms.
4. ECU
The ECU of our 20vt turbo (3B AAN ABY) engines must know the speed and position of the crankshaft in order to make a decision about fuel injector timing, etc. To do this, it uses a Crank Position Sensor audi tt key fob not working (G4) and an Engine Speed Sensor (G28). If either of these sensors go bad you will get codes on the diagnostic scanner which could cause engine shut down.
The signs of a failed G28 sensor include an inaccurate rev counter for the gearbox the gears are shifting faster than normal and/or a misfire when you're in gear. If you have any of these issues it is likely your sensor is deteriorating and needs replacing. The good news is they are very affordable and easy to find particularly in the case of the Bosch model, which is what we have. Alternatively, the GM version of this component is also a good option.
5. Tachometer
A malfunctioning engine speed sensor could be the reason behind many issues in your vehicle. It is an important part of the transmission of your audi tt key fob not working (your input here) because it relays information to the ECU regarding how fast or slowly the engine of the car is spinning. When this sensor fails, it can cause problems for the transmission, as well as the rest of the car's components.
The G5 engine speed sensor is located at the outside of the transmission just above the flywheel ring gear. It sends a signal to the ECU at pin T55/49 via a grey wire. The ECU uses this signal to control the amount of fuel and boost, and also timig. It also relays it to the G5 Tachometer inside the instrument cluster. You can check the sensor for failure by checking 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 [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. You should see a resistance of approximately 1000 ohms between these two points. This is a common feature across the audi a3 key replacement 80-100-200-RS2 model, ranging beginning with the 1985 MC and up to the 1997 UrS AN and the 1995 RS2 Du You may also find them in wrecking yards.
Charles the Humble Technician shows how to replace the G28 Engine Speed Sensor. The sensor is located at the edge of transmission over the flywheel gear. It transmits a signal to the ECU via a grey wire T55/49, then to the tachometer located on the instrument cluster.
1. Engine Speed SensorIt is located on the outside of the transmission just above the flywheel ring gear G28 Engine Speed Sensor sends a signal to ECU pin T55/49 through a grey wire. The ECU uses this information to regulate boost and fuel. It also sends an indicator to the G5 Tachometer located in the 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 activate spark and injectors in the right way.
If this sensor fails when it fails, 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 indicate a chain stretch or a jump in the chain link of the upper chain. The code won't appear without the additional information supplied by other sensors (G4 or G40).
It can be a bit difficult to test because there are different connector pins, and each one has different functions. The best way to do it is by measuring the resistance between the ECU and the sensor. When the sensor is fully operational, it should be reading approximately 1000 ohms. If you're experiencing issues with this component, look for evidence of oil or coolant in the connector bay.
2. Injectors
Yesterday, while accelerating at full speed from the highway paytoll i had massive power loss like the engine is out of gas or the injectors aren't firing anymore. Today, i pulled out the spark plugs. Three were soaked with gazoline and the fourth was dry. I put a piece of tissue over each injector hole and when i turn the engine on without sparks, the three with gazoline jump right out. The fourth one remains closed. I inspected the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ I get 0ohm. So i assume the problem is in another place.
I also tried to reset the PID without success. The car will start when the G28 is disconnected, but it is running fine with the G28 connected. However the intermittent misfire issue continues to occur at higher RPM. The temperature sensor for coolant (G62) shows the wrong temp value that is -49c even after unplugging it. 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 completely ruled out all other possibilities. I'm worried that i might have missed something. Let me know should you have any suggestions! 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 which is why you can easily locate one at a wrecking yard or at a parts store. It is simple to test them: simply switch your DMM into resistance mode and determine the distance between pins 1 and 2 (with the bump at the connector audi tt key fob not working end facing up). They should be infinite ohms.
4. ECU
The ECU of our 20vt turbo (3B AAN ABY) engines must know the speed and position of the crankshaft in order to make a decision about fuel injector timing, etc. To do this, it uses a Crank Position Sensor audi tt key fob not working (G4) and an Engine Speed Sensor (G28). If either of these sensors go bad you will get codes on the diagnostic scanner which could cause engine shut down.
The signs of a failed G28 sensor include an inaccurate rev counter for the gearbox the gears are shifting faster than normal and/or a misfire when you're in gear. If you have any of these issues it is likely your sensor is deteriorating and needs replacing. The good news is they are very affordable and easy to find particularly in the case of the Bosch model, which is what we have. Alternatively, the GM version of this component is also a good option.
5. Tachometer
A malfunctioning engine speed sensor could be the reason behind many issues in your vehicle. It is an important part of the transmission of your audi tt key fob not working (your input here) because it relays information to the ECU regarding how fast or slowly the engine of the car is spinning. When this sensor fails, it can cause problems for the transmission, as well as the rest of the car's components.
The G5 engine speed sensor is located at the outside of the transmission just above the flywheel ring gear. It sends a signal to the ECU at pin T55/49 via a grey wire. The ECU uses this signal to control the amount of fuel and boost, and also timig. It also relays it to the G5 Tachometer inside the instrument cluster. You can check the sensor for failure by checking 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 [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. You should see a resistance of approximately 1000 ohms between these two points. This is a common feature across the audi a3 key replacement 80-100-200-RS2 model, ranging beginning with the 1985 MC and up to the 1997 UrS AN and the 1995 RS2 Du You may also find them in wrecking yards.
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