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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1994 (Automatic Transmission - 6T75 - DTC P0218 To DTC P0977) >> DTC P0815, P0816, or P0826 >> 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 harness connector at the transmission shift lever.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
    • If the test lamp does not illuminate, test the IGN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Verify the scan tool Driver Shift Request parameter indicates Invalid.
    • If other than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, test for 300-600 ohms between the signal circuit terminal B and ground.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the transmission control.
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