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Home >> Chevrolet >> 2014 >> SS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.2L (LS3) - DTC P0016 To DTC P0430 >> Diagnostic Information and Procedures >> DTC P0101 >> Circuit/System Testing
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Circuit/System Testing

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 inspecting for the following conditions:
    • Loose clamps, cracks, or other damage in the air intake duct system
    • Splits, kinks or improper connections at the vacuum hoses
    • Vacuum leaks at the intake manifold and throttle body
    • A dirty, restricted, or deteriorating air filter element
    • A leaking, loose, disconnected, or cracked positive crankcase ventilation valve, pipe, or seal
    • A collapsed, restricted, or collapsed air intake duct
    • A misaligned or damaged air intake duct
    • Any objects blocking the air inlet probe of the MAF/IAT sensor
    • Any contamination or debris on the sensing elements in the probe of the MAF/IAT sensor
    • A cracked or damaged MAF sensor housing
    • Any water intrusion in the induction system
    • Any snow or ice build-up at the air cleaner, MAF or MAP sensors in cold climates
    • Any intake manifold leak
    • A MAP sensor seal that is leaking, missing, or damaged
    • Improperly installed components
    • An Intake Manifold Resonator with a leaking seal, or a cracked or broken housing
    • If a condition is found 

      Repair or replace component as appropriate.

    • No condition found 
  2. Ignition OFF, disconnect the harness connector at the B75B Mass Air Flow /Intake Air Temperature sensor.
  3. Test for less than 2 Ω between the ground circuit terminal C and ground.
    • If 2 Ω or greater 
    1. Ignition OFF.
    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 ground connection.
    • If less than 2 Ω 
  4. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal B and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    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.
    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 B 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 
  5. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal A and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the 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 engine control module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the engine control module, ignition ON.
    2. 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 engine control module.
    • If between 4.8-5.2 V 
  6. Determine if EL-38522-A   Variable Signal Generator or equivalent is available.
    • EL-38522-A, Variable Signal Generator; or equivalent is not available 
    1. Test or replace the B75B Mass Air Flow /Intake Air Temperature 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.

      • If the DTC does not set 
    4. All OK.
    • EL-38522-A, Variable Signal Generator; or equivalent is available 
  7. Ignition OFF, connect the leads of the EL-38522-A   Variable Signal Generator as follows:
    • Red lead to the signal circuit terminal A at the harness connector
    • Black leads to ground
    • Battery voltage supply lead to B+
  8. Set the EL-38522-A   Variable Signal Generator to the following specifications.
    • Signal switch to 5 V
    • Frequency switch to 5 kHz
    • Duty Cycle switch to 50 % (Normal)
  9. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be 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. 
  10. Test or replace the B75B Mass Air Flow /Intake Air Temperature sensor.
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