LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2011 >> Yukon Base, 5.3 3 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0721-P0723 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  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 Q8 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 Q8 control solenoid valve assembly.
  2. Ignition Off, connect the red lead of J 38522  generatorto the signal circuit terminal B and the black lead to the ignition circuit terminal A.
  3. Adjust the J 38522  generatorto 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 Q8 control solenoid valve assembly.
  5. If all circuits test normal, test or replace the B14A Automatic Transmission Output Shaft Speed Sensor.
scientia non olet · About LEMON Manuals