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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 2.0L (LUZ) Diesel - DTC P0016 To DTC P0406) >> Diagnostic Information and Procedures >> DTC P0101: Mass Air Flow (MAF) Sensor >> 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 the Circuit/System Testing.
  • You must perform the Diagnostic Repair Verification after completing the Circuit/System Testing.
  1. Verify the integrity of the entire air induction system by verifying that none of the following conditions exist:
    • A dirty or deteriorating air filter element
    • A leaking, loose, disconnected or cracked positive crankcase ventilation (PCV) valve, pipe or seal
    • Improper operation of the PCV system
    • A loose, disconnected or inoperative PCV heater
    • A loose or disconnected charge air cooler hose or pipe
    • A restricted or collapsed air intake duct
    • A misaligned or damaged air intake duct
    • Any objects blocking the air inlet probe of the Mass Air Flow/Intake Air Temperature sensor
    • Any contamination or debris on the sensing elements in the probe of the Mass Air Flow/Intake Air Temperature sensor
    • A cracked or damaged mass air flow sensor housing
    • Any water intrusion in the induction system
    • Any snow or ice build-up at the air cleaner, mass air flow or manifold absolute pressure sensors in cold climates
    • An intake manifold leak
    • A manifold absolute pressure sensor seal that is leaking, missing or damaged
    • An Intake Manifold Resonator with a leaking seal or a cracked or broken housing
    • Any leaks or restrictions in the exhaust system. Refer to Symptoms - Engine Exhaust .
    • If a condition exists 

      Repair as necessary.

    • If no condition exists 
  2. Engine idling at operating temperature.
    1. Command the EGR solenoid to 0% with a scan tool.
    2. Observe the Induction System Leak Indication parameter for 10 s. Verify the parameter stabilizes after 10 s and is between 0.80:1 and 1.20:1.
    3. Slowly increase the engine speed until reaching WOT.
    4. Verify the Induction System Leak Indication parameter stabilizes after 10 s and is between 0.80:1 and 1.20:1.
    • If not stable after 10 s and between 0.80:1 and 1.20:1. 

      Test the charge air cooler system and air inlet system for leaks.

    • If stable after 10 s and between 0.80:1 and 1.20:1. 
  3. Verify the exhaust gas recirculation valve is in the closed position, by visual inspection. Refer to Exhaust Gas Recirculation Pipe Replacement .
    • If the exhaust gas recirculation valve is not closed. 

      Replace the exhaust gas recirculation valve and gaskets.

    • If the exhaust gas recirculation valve is closed. 
  4. Engine idling, at operating temperature.
    1. Command the EGR solenoid to 0% with a scan tool.
    2. Observe the Induction System Leak Indication parameter for 10 s. Verify the parameter stabilizes after 10 s and is between 0.80:1 and 1.20:1.
    3. Slowly increase the engine speed until reaching wide open throttle (WOT).
    4. Verify the Induction System Leak Indication parameter stabilizes after 10 s and is between 0.80:1 and 1.20:1.
    • If not stable after 10 s and between 0.80:1 and 1.20:1. 

      Test the charge air cooler system and air inlet system for leaks.

    • If stable after 10 s and between 0.80:1 and 1.20:1. 
  5. Verify the exhaust gas recirculation valve is in the closed position, by visual inspection. Refer to Exhaust Gas Recirculation Pipe Replacement .
    • If the exhaust gas recirculation valve is not closed. 

      Replace the exhaust gas recirculation valve and gaskets.

    • If the exhaust gas recirculation valve is closed. 
  6. Ignition OFF, disconnect the harness connector at the B75C Multifunction Intake Air sensor.
  7. Test for less than 2 Ω between the ground circuit terminal 4 and ground.
    • If 2 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open or high resistance in the circuit.
      • If less than 2 Ω replace the K20 Engine Control Module.
    • If less than 2 Ω 
  8. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 5 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit.
    2. Test for less than 2 Ω in the ignition voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp and remove the fuse for the ignition voltage circuit.
    2. Test for infinite resistance between the ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for greater than 2 Ω between the ignition voltage circuit terminal 5 and ground.
      • If less than 2 Ω, repair the short to ground on the circuit.
      • If greater than 2 Ω, test all the components connected to the circuit and repair or replace as necessary.
    • If the test lamp illuminates 
  9. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 3 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector 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 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
      NOTE: If the signal circuit is shorted to a voltage the engine control module or the sensor may be damaged.
    2. Ignition ON, test for less than 1 V between the signal circuit 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.
    • If between 4.8-5.2 V 
  10. Ignition OFF, connect the leads of the EL-38522-A  Variable Signal Generator as follows:
    • Red lead to the signal circuit terminal 3 at the harness connector
    • Black leads to ground
    • Battery voltage supply lead to B+
  11. 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
  12. Engine idling.
  13. 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.

    • If between 4, 950-5, 050 Hz. 
  14. Test or replace the B75C Multifunction Intake Air sensor.
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