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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 2000 (Automatic Transmission - 4T45-E - DTC P0973 To DTC P2797) >> DTC P0B09 or P2796 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify all connectors at the Auxiliary transmission pump, SGCM, and HPD module are fully engaged.
  2. Ignition OFF, disconnect the Auxiliary Transmission Fluid Pump Relay.
  3. Ignition ON, verify that a test lamp does not illuminate between the relay switch supply circuit and ground.
    • If the test lamp illuminates, test the relay controlled output circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the relay coil B+ circuit and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
    • If the circuit tests normal and the B+ circuit fuse is open, test the relay coil control circuit for a short to ground. If the circuit tests normal, test or replace the Auxiliary Transmission Pump Relay.
  5. Verify that a test lamp illuminates between the relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  6. Disconnect the harness connector at the Hybrid Pump Driver (HPD).
  7. Test for less than 10 ohm of resistance between the HPD ground circuit terminal E and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  8. Test for less than 10 ohm of resistance at bare ground cable attached to Starter Generator Control Module and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  9. Ignition OFF, disconnect the Auxiliary Trans Pump Relay. Test for 72-82 ohms of resistance between terminals 85 and 86.
    • If not within the specified range, replace the relay.
  10. Test for infinite resistance between the following terminals:
    • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • If not the specified value, replace the relay.
  11. Install a 5A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87.
    • If greater than the specified range, replace the relay.
  12. Test for less than 10 ohm of resistance between the pump control circuit terminal B and terminal 15 of the SGCM.
    • If greater than the specified range, test the pump control circuit for an open/high resistance.
  13. Test for less than 10 ohms of resistance between the transmission pump driver error circuit terminal A of the HPD and terminal 14 of the SGCM.
    • If greater than the specified range, test the transmission pump driver error circuit for an open/high resistance.
  14. Test for less than 10 ohms of resistance between the pump motor voltage circuit terminal C of the HPD and terminal 1 of the SGCM.
    • If greater than the specified range, test the transmission pump driver error circuit for an open/high resistance.
  15. Disconnect Auxiliary Trans pump connector and test for 0.5-3.0 ohm of resistance between transmission pump high reference circuit terminal A and the transmission pump low reference terminal B.
    • If not within the specified range, replace the Auxiliary Trans Pump.
  16. Disconnect the HPD connector and test for less than 1 ohm of resistance between the Transmission pump high reference circuit terminal G and terminal A and the transmission pump low reference circuit terminal F and terminal B for an open/high resistance.
    • If greater than the specified range, test the transmission pump low and high reference circuits for an open/high resistance.
  17. If all circuits test normal, replace SGCM assembly including the HPD module.
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