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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0010 - P034B)) >> Diagnostic Information And Procedures >> DTC P0101: Mass Air Flow (MAF) Sensor Performance >> Circuit/System Testing

Circuit/System Testing

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

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Verify the integrity of the entire air induction system by verifying that none of the conditions listed below exist:
    • Any damaged components
    • Improper operation of turbocharger wastegate actuator or bypass valve; where equipped
    • Improperly installed components
    • Collapsed, restricted, or damaged components
    • Loose clamps, cracks, or other damage
    • An air flow restriction
    • Restricted air filter
    • Splits, kinks, leaks, or improper connections at the vacuum hoses
    • Vacuum leaks at the intake manifold, MAP sensor, and throttle body
    • Water intrusion
    • Any snow or ice buildup, in cold climates
    • Contamination of the Mass Air Flow sensor element
    • If a condition is found 

      Repair or replace component as necessary.

    • Go to next step: If no condition is found 
  2. Determine if EL-38522-A  or equivalent is available.
    • If EL-38522-A or equivalent is not available 
    1. Test or replace the B75C Multifunction Intake Air sensor.
    2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
    3. Verify the DTC does not set.
      • If the DTC sets 

        Replace the K20 Engine Control Module.

      • Go to next step: If no DTCs set 
    4. All OK.
    • Go to next step: If EL-38522-A or equivalent is available 
  3. Ignition Off, connect the leads of the EL-38522-A  as listed below:
    • Red lead to the signal circuit terminal 6 at the harness connector
    • Black leads to ground
    • Battery voltage supply lead to B+
  4. Set the EL-38522-A  to the specifications listed below:
    • Signal switch to 5 V
    • Frequency switch to 5 kHz
    • Duty Cycle switch to 50 % (Normal)
  5. Engine idling, verify the scan tool MAF Sensor parameter is between 4, 950 - 5, 050 Hz.
    • If not within the specified range 

      Replace the K20 Engine Control Module.

    • Go to next step: If within the specified range 
  6. Test or replace the B75C Multifunction Intake Air sensor.
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