Fuel tank indicating empty when there is plenty of fuel in the tank.
Posted: Wed Apr 12, 2017 5:20 pm
My daughter's 1.0 AUC 2000 Polo is reading empty at all times on the Fuel guage. the amber low level petrol pump symbol is not lit.
I have tested it with Vagcom and it shows the following fault
DTC 00771 - Fuel Level Sensor (G)
30-00 Open or Short to Plus
i have carried out some wiring checks using a Haynes Manual ( I hope the diagram is right ) and found the following:
0.3V supply at pin 2 on the fuel guage sender when the ignition is switched on.
When a resistance check is carried out between pin 3 on the fuel guage sensor and pin 7 on the blue plug to the instrument cluster there is a high resistance of 4 Megaohms.
However when a resistance check is carried out between pin 2 on the coolant temperature sensor connector and pin 7 on the same blue plug to the instrument cluster the resistance is 1.2 ohms.
Also when a resistance check is carried out between pin 2 of the expansion tank coolant level sensor and again pin 7 of the same blue plug to the instrument cluster the resistance is also about 1.2 ohms
Does anybody know where the three brown and white earth wires are connected / spliced together into one brown and white earth wire as shown in the Haynes manual ???
As I suspect there is a high resistance between pin 3 on the fuel guage sender connector and wherever they are connected together.
Any help / directions / corrections would be much appreciated.
Rgds.
Silver
I have tested it with Vagcom and it shows the following fault
DTC 00771 - Fuel Level Sensor (G)
30-00 Open or Short to Plus
i have carried out some wiring checks using a Haynes Manual ( I hope the diagram is right ) and found the following:
0.3V supply at pin 2 on the fuel guage sender when the ignition is switched on.
When a resistance check is carried out between pin 3 on the fuel guage sensor and pin 7 on the blue plug to the instrument cluster there is a high resistance of 4 Megaohms.
However when a resistance check is carried out between pin 2 on the coolant temperature sensor connector and pin 7 on the same blue plug to the instrument cluster the resistance is 1.2 ohms.
Also when a resistance check is carried out between pin 2 of the expansion tank coolant level sensor and again pin 7 of the same blue plug to the instrument cluster the resistance is also about 1.2 ohms
Does anybody know where the three brown and white earth wires are connected / spliced together into one brown and white earth wire as shown in the Haynes manual ???
As I suspect there is a high resistance between pin 3 on the fuel guage sender connector and wherever they are connected together.
Any help / directions / corrections would be much appreciated.
Rgds.
Silver