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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1372 (Automatic Transmission - 2ML70 - DTC P0218 To DTC P0965-P0967) >> DTC P0721-P0723 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, test for 8.3-9.3 V between the automatic transmission output shaft speed sensor ignition circuit terminal A and ground.
    • If less than the specified range, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control solenoid valve assembly.
    • If greater than the specified range, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the control solenoid valve assembly.
  2. Ignition Off, connect the red lead of J 38522  to the signal circuit terminal B and the black lead to the ignition circuit terminal A.
  3. Adjust the J 38522  to 8 V, the Frequency to 120 Hz and the Percent Duty Cycle to 50 percent.
  4. Ignition ON, verify the scan tool Transmission OSS parameter is between 100-400 RPM.
    • If not within the specified range, test the signal circuit for a short to voltage short to ground open/high resistance. If the circuit tests normal, replace the control solenoid valve assembly.
  5. If all circuits test normal, test or replace the B14A Automatic Transmission Output Shaft Speed Sensor.
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