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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (1 Of 5)) >> Diagnostic Information and Procedures >> DTC P0101 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    Circuit/System Testing must be performed before proceeding with Component Testing.

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: B75 Mass Airflow Sensor
  3. Install the special tool: EL-38522 Variable Signal Generator
    • Red lead @ Signal circuit terminal 2
    • Black lead @ Ground
    • Set the voltage to 5 V
    • Set the frequency to 5 000 Hz
    • Set the duty cycle to 50%
  4. Engine at Idle
  5. Verify the scan tool parameter: MAF Sensor = 4 950 to 5 050 Hz
    • If not between 4 950 and 5 050 Hz 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Test for less than 2 ohms between the test points: Signal circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K20 Engine Control Module
    • Go to next step: If between 4 950 and 5 050 Hz 
  6. Replace the component: B75 Mass Airflow Sensor
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