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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 P0721-P0723 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Remove the OSS. Inspect the OSS, harness, and connector pins for metallic debris and the hybrid direct, 2-3-4 clutch housing assembly machined teeth for damage or misalignment. Even one bent or misaligned tooth, and or contact with the OSS, may cause this DTC to set. Proper torque of 9-13 N.m (80-115 lb in) to the OSS mounting bolt is critical to proper OSS operation. The hybrid system is very sensitive to the OSS signal for overall operation.
    • If damage is observed, replace the damaged component.
  2. 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 the OSS supply voltage circuit tests normal, replace the control solenoid (w/body and TCM) valve assembly.
    • If greater than 9.3 volts, test the OSS supply voltage circuit for a short to voltage.
  3. Using a terminal test kit, connect the red lead of J 38522  to the OSS signal circuit terminal B and the black lead to the OSS supply voltage circuit terminal A.
  4. Set the J 38522  Signal to 8 volts, the Frequency to 120 and the Percent Duty Cycle to 50.
  5. With the ignition ON, observe the Transmission OSS parameter, The Transmission OSS parameter should display between 100-400 RPM.
    • If the Transmission OSS is not within the specified range, test the Transmission 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 Transmission OSS is within the specified range, replace the OSS.
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