How to Replace an Audi tt key Fob Not Working G28 Engine Speed Sensor
In this video Charles the Humble Mechanic shows how to replace the G28 engine speed sensor. This sensor is situated on the outside of the transmission just above the flywheel gear. It sends a signal to the ECU via the grey wire (T55/49) which is then sent to the tachometer in the instrument cluster.
1. Engine Speed Sensor
The grey wire is located on the edge of transmission, directly above the flywheel ring. The sensor sends a signal via the grey wire to pin T55/49. The ECU utilizes this information to regulate boost and fuel. It also sends an alert to the G5 Tachometer in instrument cluster.
The sensor is used to correlate the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft is TDC and where the camshaft is so it can activate spark and injectors according to the situation.
If this sensor fails, the ECU will display a P00160 error message. This indicates that the Crank Shaft is out of sync with the Intake Camshaft. It could also be a sign of the possibility of a chain stretch or jump in the chain link of the upper timing chain. However, the code won’t appear on its own, without additional information from other sensors (G4 and G40).
Testing can be a bit difficult since there are two pins for the connector and they have different functions however the best method to test it is by measuring resistance between the sensor and the ECU. It should read around 1000 ohms when it is operating at its maximum. Examine for signs of coolant, or oil in the connector bay if you are experiencing issues with this part.
2. Injectors
Yesterday, when accelerating from highway paytoll at a high speed I noticed a massive drop in power. It was like the engine had run out of gas. Or, my injectors weren’t firing. Today, i pulled out the spark plugs, 3 were soaked with gazoline and the fourth was dry. When I start the engine, there are no sparks, i place a tissue on the top of each hole in the injector and the 3 drenched with gazoline pop out, but the 4th one stays shut. I inspected the ground connection on ECU pins 14/55/30/55/48/55/14/55/48/ I got zero ohm. I think the issue is somewhere else.
I also tried to reset the PID but with no luck. The car can start if the G28 is unplugged and it runs perfectly when it is connected but it still has the intermittent misfire issue at higher RPM. The temperature sensor for coolant (G62) shows the wrong temperature value of -49c even when i unplug it. Also i noticed that the gauge for oil pressure in the cockpit shows 2 bar, whereas the actual pressure is 0.0 when i rev the engine.
I’m not sure what to do, but i think i’ve pretty much ruled out everything else. However, i’m afraid that I may have missed something. Let me know if you have any ideas! TIA!
3. Fuel Pump
The fuel pump of the g28 receives a signal from the RPM sensor. The GM-style sender is identical to the G4 and both are used in the 80, 100 200, UrS and RS2 cars so you can easily find one at a wrecking yard or from a parts store. Testing them is easy – put your DMM in resistance mode and take measurements between pins 1 (with the bump on the connector’s side up) and 2 (2nd from the left on the black connector’s end). They must be infinite Ohms.
4. ECU
Our 20vt turbo (3B AAN, ABY, and ADU) engines have an ECU that has to be aware of the speed and position of the crankshaft to make decisions about timing of the fuel injector, for example. In order to do this it utilizes a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these go badly, you will see codes on the diagnostic scanner which could cause engine shut down.
The signs of a failing G28 sensor include an inaccurate rev counter in the gearbox and gears that shift faster than normal and/or misfiring when you are in gear. It is probable that the sensor is failing and requires to be replaced if you experience any of these signs. They’re inexpensive and easy to locate, especially when they’re a Bosch model like ours. Alternately, GM’s version this part would be an option.
5. Tachometer
A failing engine speed sensor audi car key replacement could be the reason behind a slew of issues in your car. It’s an essential component of your audi a5 key fob‘s transmission, as it sends information to the ECU about how fast or slow the car’s crankshaft is rotating. If this sensor audi Replacement key cost fails, it could disrupt the performance of the transmission as well as the other car’s components.
The G5 engine speed sensor is situated on 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 utilizes this signal to control the amount of fuel and boost, and also to timigrate. It also relays it to the G5 Tachometer inside the instrument cluster. You can test the sensor for any failure by checking the continuity between it and the tachometer, 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. There should be an average resistance of 1000 ohms in these areas. This part is common across the key audi 80-100-200-RS2 range, beginning with the 1985 MC and up to the 1997 UrS An and 1995 RS2 Du, so you might find some good ones in wrecking yards.