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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Engine Controls And Fuel - 1.5L (LFV) - DTC P0010-DTC P0366) >> Diagnostic Information and Procedures >> DTC P0236, P0237, or P0238 >> Circuit/System Testing

Circuit/System Testing

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  1. Verify no other DTCs are set.
    • Go to next step: If none of the DTCs are set 
  2. Verify the conditions listed in the table do not exist:
    • Loose clamps, cracks, or other damages to the intake system.
    • Collapsed or restricted intake air duct.
    • Clogged air cleaner.
    • Vacuum hoses with kinks, leaks, or improper connections.
    • Missing, restricted or leaking exhaust components.-Refer to:Symptoms - Engine Exhaust
    • Leaks at the intake manifold or throttle body.
    • If a condition exists 

      Repair as necessary

    • Go to next step: If no conditions exist 
    3. NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  3. Ignition/Vehicle & All vehicle systems - Off
  4. Disconnect the electrical connector:B111 Turbocharger Boost SensorIt may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  5. Test for less than 5 ohms between the test points:Low Reference circuit terminal 2 & Ground
    • If 5 ohms or greater 
    1. Disconnect the electrical connector:X3 @ K20 Engine Control Module
    2. Test for less than 2 ohms between the test points:Low Reference circuit terminal 2 @ Component harness & The other end of the circuit
      • 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 less than 5 ohms 
  6. Ignition - On/Vehicle - In Service Mode
  7. Test for 4.8 to 5.2 V between the test points:5 V Reference circuit terminal 1 & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X3 @ K20 Engine Control Module
    3. Test for infinite resistance between the test points:5 V Reference circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:5 V Reference circuit terminal 1 @ Component harness & The other end of the circuit
      • 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
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:5 V Reference circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K20 Engine Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  8. Verify the scan tool parameter:Boost Pressure Sensor = Greater than 4.5 V
    • If 4.5 V or less 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 3@ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K20 Engine Control Module
    • Go to next step: If greater than 4.5 V 
  9. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 3 & Low Reference circuit terminal 2
  10. Verify the scan tool parameter:Boost Pressure Sensor = Less than 0.2 V
    • If 0.2 V or greater 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points:Signal circuit terminal 3 @ Component harness & The other end of the circuit
      • 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 less than 0.2 V 
  11. Test or replace the component:B111 Turbocharger Boost Sensor
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