B1730

Fault symptoms
Engine malfunctioning.
The trip computer indicates incorrect average fuel consumption.


NOTE: Diagnostic trouble code B1730 will also be generated if the throttle is suddenly opened wide from a nearly closed position.


Diagnostic procedure
1 If the engine malfunctions, start by checking whether any diagnostic trouble codes are present in the engine management system. If there are, deal with them.

If this is not the case, continue with point 2.
2 Connect an Intellegent Saab Tester (ISAT) Scan Tool, start the engine and select "READ VALUES" followed by "FUEL CONSUMED".
3 If the fuel consumption signal is OK, the reading obtained should increase as long as the engine is running.

The fuel consumption display always begins at zero each time the engine is started.
4 If there is no fuel consumption signal, check the signal sent to the main instrument display panel by connecting a BOB to its 56-pin connector (the main instrument display panel should not be connected).

Connect the Scan Tool's test leads to pin 8 and battery positive, then select "MEASURE" followed by "PULSE". Start the engine and check whether any pulses are present.

If pulses are generated, proceed to point 6.
5 If no pulses are present, there is probably an open circuit in the wiring connected to the main instrument display panel. Check and take appropriate action.
6 There could be an open circuit between the connector and the processor in the main instrument display panel's control module. Continue fault diagnosis as described in "Before Changing A Control Module".