Fuel Gauge

Fault symptoms
The fuel gauge shows empty.

Diagnostic procedure
1 Connect the Intellegent Saab Tester (ISAT) Scan Tool arid then select "READ VALUES" followed by "TANK CONTENTS".
2 If the fuel level sensor signal is OK, the tank contents shown on the Scan Tool display should correspond to the amount of fuel in the tank.

Check the operation of the fuel gauge by connecting the Scan Tool and then selecting "TEST FUNCTIONS" followed by "FUEL GAUGE TEST".

If in proper working order, the fuel gauge needle should travel from empty (R) to full (F) and then back to empty.

If it does not, remove the main instrument display panel's rear section complete with processor card and check that all leads connected to the connector marked CN3 are securely located.

If any lead has worked loose or is broken, continue in "Before Changing A Control Module".

If the leads connected to the connector are all ok, the fault is probably in the intermediate part with the indicating instruments.