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How to Replace an [http://www.pcsq28.com/home.php?mod=space&uid=369566 audi q5 key] G28 Engine Speed Sensor<br><br>Charles the Humble Technician teaches how to replace the G28 Engine Speed Sensor. The sensor is located at the edge of transmission, above the flywheel gear. It transmits a signal to the ECU via a grey wire T55/49, then to the tachometer in the instrument cluster.<br><br>1. Engine Speed Sensor<br><br>Located on the edge of the transmission just above the flywheel ring gear the G28 Engine Speed Sensor sends an electrical signal to ECU pin T55/49 using an uncolored wire. The ECU utilizes this information to regulate the amount of fuel and boost. It also sends a signal to the G5 tachometer in the instrument cluster.<br><br>The sensor is used to connect the G40 Camshaft position Sensor. The ecu needs to know when the crankshaft reached TDC and also where the camshaft lies in order to activate the spark and injectors.<br><br>If this sensor fails, the ECU will display a P00160 code which means the Crank Shaft and Intake Camshaft aren't in sync and possibly indicating the chain stretching or a jump link on the upper timing chain. The code won't show without the additional information provided by other sensors (G4 or G40).<br><br>Testing can be a bit difficult because there are two connector pins and they serve different purposes however the best method to test it is to measure resistance between the sensor and the ECU. It should read approximately 1000 ohms if the sensor is in full operation. If you're experiencing issues with this sensor, look for signs of coolant or oil in the connector bay.<br><br>2. Injectors<br><br>Yesterday, when i was accelerating to the fullest speed from highway paytoll, i experienced massive power loss like the engine is out of gas or injectors are not firing anymore. Today, i pulled out the spark plugs, three were drenched in gazoline, the 4th one was dry. When i crank the engine, there are no sparks, i place a tissue on top of each injector hole and the 3 that were drenched in gazoline leap out, however the 4th stays shut. I tested the ground connection of ECU pins 14,30, and 48/55. I got zero ohm. I assume that the problem is elsewhere.<br><br>I also tried to reset PID but without success. The car will start when the G28 is disconnected and it runs perfectly when it is plugged in however it has intermittent misfire issues at higher RPM. The coolant sensor (G62), even if it is not plugged in, shows an ice temperature of -49c. Also i noticed that the gauge for oil pressure in the cockpit is showing 2 bar while the actual pressure is 0.0 when I crank up the engine.<br><br>I'm not sure what to do. I think I've all other possibilities out. I'm concerned that i may have missed something. Let me know should you have any suggestions! TIA!<br><br>3. Fuel Pump<br><br>The fuel pump in the g28 can be activated by a signal sent by the RPM sensor. The GM-style transmitter is similar 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. Testing them is easy - put your DMM in resistance mode and take measurements between pins 1 (with the bump on the connector's end up) and 2 (2nd from the left on the black end of the connector). They should be infinite Ohms.<br><br>4. ECU<br><br>The ECU of our 20vt turbo (3B AAN ABY ADU) engines must be aware of the position and speed of the crankshaft to make decisions regarding timing of the fuel injector, etc. It utilizes a Crank Position Sensor G4 and an Engine Speed Sensor G28 to accomplish this. If either of these go wrong, you will receive codes on the diagnostic scanner that could cause engine shut down.<br><br>Some of the symptoms of a failing G28 sensor include an inaccurate rev counter for the gearbox and gears that shift faster than normal and/or a misfire when you are in gear. If you have any of these problems, it is most likely that your sensor is deteriorating and should be replaced. They're inexpensive and easy to locate, especially if they're a Bosch sensor like ours. Alternatively, the GM version of this part is also a great option.<br><br>5. Tachometer<br><br>A failing engine speed sensor could be a cause for many issues in your car. It is a crucial part of the [https://stamfordtutor.stamford.edu/profile/viewseal79/ audi key programming]'s transmission because it communicates to the ECU about how the car's crankshaft is turning. This sensor could cause the transmission to malfunction and other car components to be affected.<br><br>The G5 engine sensor is located at the edge of transmission, above the flywheel ring. It sends an electrical signal through an uncolored wire to the ECU pin T55/49. The ECU utilizes this signal to regulate the amount of fuel and boost, and also timig. It also transmits it to the G5 Tachometer located in the instrument cluster. You can check the sensor for failure by examining the continuity between it and the tachometer, between the ECU pin T55/49 and the instrument cluster connection via pin T6a/1 (trace [79]) and between pin T6a/1 and the instrument cluster pin T26a/12. You should see the resistance to be around 1000 ohms between these two points. 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