Scantool Diagnostics
P0641 Sensor Reference Voltage 'A' Circuit/Open
Scantool Diagnostics
Monitor GDS Data
1. Connect GDS to Data Link Connector (DLC).
2. IG "ON".
3. Select "DTC" button, and then Press "DTC Status" to check DTC's information from the DTCs menu.
4. Read "DTC Status" parameter.

5. Is parameter displayed "Present fault"?
