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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P0016 - P049D)) >> Diagnostic Information And Procedures >> DTC P0102 Or P0103: Mass Air Flow (MAF) Sensor Circuit Low/High Frequency >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF and all systems OFF. Disconnect the harness connector at the B75C Multifunction Intake Air Sensor.
  2. Test for less than 5 Ω between the ground circuit terminal 7 and ground.
    • If 5 Ω or greater 
    1. Disconnect the sensor chassis ground.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the chassis ground connection.
    • Go to next step: If less than 5 Ω 
  3. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 5 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp and disconnect harness connector X2 at the K20 Engine Control Module.
    2. Test for infinite resistance between the voltage supply circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the voltage supply circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • Go to next step: If the test lamp illuminates 
  4. Ignition ON, test for 4.8 - 5.2 V between the MAF signal circuit terminal 6 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect harness connector X1 at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If greater than 5.2 V 
      NOTE:

      If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.

    1. Ignition OFF, disconnect the harness connector X1 at the K20 Engine Control Module.
    2. Ignition ON, test for less than 1 V between the signal circuit terminal 6 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • Go to next step: If between 4.8 - 5.2 V 
  5. Ignition OFF, connect the leads of the EL-38522-A  Variable Signal Generator as follows:
    • Red lead to the signal circuit terminal 6 at the harness connector
    • Black leads to ground
    • Battery voltage supply lead to B+
  6. Set the EL-38522-A  Variable Signal Generator to the following specifications.
    • Signal switch to 5 V
    • Duty Cycle switch to 50% (Normal)
    • Frequency switch to 5 KHz
  7. Engine idling.
  8. Verify the scan tool MAF Sensor parameter is between 4, 950 - 5, 050 Hz.
    • If not between 4, 950 - 5, 050 Hz. 

      Replace the K20 Engine Control Module.

    • Go to next step: If between 4, 950 - 5, 050 Hz. 
  9. Replace the B75C Multifunction Intake Air sensor.
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