B1720

Fault symptoms
The fuel gauge shows empty.

The low fuel warning lamp lights up.

Some of the trip computer's functions are affected.

Diagnostic procedure
1 Connect the Intellegent Saab Tester (ISAT) Scan Tool and select "READ VALUES" followed by "TANK CONTENTS".
2 If the fuel level sensor signal is OK, the reading shown on the ISAT Scan Tool's display should correspond to the contents of the fuel tank. If this is the case, continue with point 7.
3 If the display shows tank contents = 0, the fuel level sensor signal sent to the main instrument display panel is faulty. In this case, continue by checking the fuel level sensor, point 4.
4 Unplug the fuel level sensor's connector, which is located under a cover under the rear seat, and take a resistance reading across the pins. The correct resistance is between 50 and 390 ohms.

If the resistance is outside this range, the transmitter or its connecting lead is at fault. Check and take the necessary action.