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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 P1876 or P1877 >> 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. Ignition OFF. Disconnect the automatic transmission control assembly connector.
  2. Ignition ON, verify that a test lamp illuminates between the 12-volt reference circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the BCM.
  3. Ignition OFF, test for 300-500 ohms between the Tap Up/ Tap Down enable signal circuit and ground.
    • If not within the specified range, test the Tap Up/ Tap Down enable signal circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the BCM.
  4. If all circuits test normal test or replace the automatic transmission control assembly.
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