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Home >> Cadillac >> 2009 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Automatic Transmission - 2ML70 - DTC P0218 To DTC P0967) >> DTC P077B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Operate the vehicle at 16-32 km/h (10-20 mph) while observing the Transmission Data Output Shaft Direction parameter on the scan tool.
    • If the Output Shaft Direction parameter corresponds with the vehicle direction and DTC P077B is set in the HPCM and not the TCM, replace the HPCM.
    • If DTC P077B is also set in the TCM continue testing.
  2. Disconnect the OSS connector.
  3. Test for 8.3-9.3 volts between the OSS supply voltage circuit and ground.
    • If less than 8.3 volts, test the OSS supply voltage circuit for an open/high resistance or short to ground.
    • If greater than 9.3 volts, test the OSS supply voltage circuit for a short to voltage.
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Output Shaft Speed Input Test .
    • If the OSS signal is not within the specified range, test the OSS signal circuit for an open/high resistance, short to ground, or a short to voltage.
    • If the circuit tests normal, replace the control solenoid (w/body and TCM) valve assembly.
    • If the OSS signal is within the specified range, visually inspect the OSS and the output shaft machined surface for damage or misalignment. If OK, replace the OSS.
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