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Home >> Saab >> 2010 >> 9-5 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Management And Fuel System, V6 (3 Of 5) >> DTC P0641: 5 V Reference Circuit; DTC P06A6: 5 V Reference Performance >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B47 fuel pressure sensor.
  2. Ignition OFF, test for less than 1.0 Ω between the low reference circuit terminal 2 and ground.
  3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
  4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.
  5. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
  6. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K27 Fuel Pump Control Module.
  7. If all circuits test normal, replace the B47 fuel pressure sensor.
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