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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826, or P1876 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the automatic transmission shift lever harness connector.
  2. Ignition ON, verify with a scan tool the Tap Up/Down Switch parameter displays OFF in the Chassis Data list under BCM.
    • If not the specified value 

      Repair the short to ground in the 12 volt signal circuit. If the circuit tests normal, replace the BCM.

    • If the specified value 
  3. Ignition ON, test for greater than 11 volts between the ignition voltage circuit terminal 4 and ground at the battery negative post.
    • If less than the specified value 

      Test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

    • If greater than the specified value 
  4. Ignition OFF, test for 6.6-7.0 K ohms between terminal 3 and terminal 4 on the automatic transmission shift lever harness connector. Also, test for 3.7-4.2 K ohms when pressing the minus (-) switch and 1.7-2.0 K ohms when selecting the plus (+) switch.
    • If not within the specified values 

      Replace the automatic transmission shift lever.

    • If within the specified value 
  5. Test the signal circuit between the BCM and the automatic transmission manual shift switch for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
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