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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0106, P0107, or P0108 >> Circuit/System Testing

Circuit/System Testing

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

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Perform the following procedure/test: Component/System Leak Test

    Verify the procedure/test passes.

    • If the procedure/test does not pass 

      Repair or replace as necessary

    • Go to next step: If the procedure/test passes 
  3. Verify the following conditions do not exist:
    • B75C Multifunction Intake Air Sensor - Contamination of the measuring element/Water intrusion/Cracked/Loose Clamps/Visible Damage
    • Air Cleaner Element - Dirty/Restricted
    • Exhaust System - Leaking/Missing components/Restricted
    • Intake Air Duct & Intake Manifold - Cracked/Loose Clamps/Restricted/Visible Damage - Refer to Intake Manifold Cleaning and Inspection
    • O-Ring @ B65 Intake Manifold Pressure and Air Temperature Sensor/Leaking/Missing/Visible Damage
    • Positive Crankcase Ventilation System - Leaking/Incorrect connection/Restricted
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  4. Test or inspect for the following: - Mechanical Condition
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  5. 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.

  6. Disconnect the electrical connector: B65 Intake Manifold Pressure and Air Temperature Sensor
  7. Test for less than 5 ohms between the test points: Low Reference circuit terminal 3 & Ground
    • If 5 ohms or greater 
    1. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 3 @ Component harness & The other end of the circuit @ Control module harness
      • 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 
  8. Ignition - On/Vehicle - In Service Mode
  9. Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 2 & Low Reference circuit terminal 3
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: @ K20 Engine Control Module
    3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 2 @ 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 2 @ Component harness & The other end of the circuit @ Control module harness
      • 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 appropriate 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 2 @ 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 
  10. Verify the scan tool parameter: MAP Sensor = Less than 0.5 V
    • If 0.5 V or greater 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate 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 4 @ 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 less than 0.5 V 
  11. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 4 & 5 V Reference circuit terminal 2
  12. Verify the scan tool parameter: MAP Sensor = Greater than 4.5 V
    • If 4.5 V or less 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 4 @ 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: Signal circuit terminal 4 @ Component harness & The other end of the circuit @ Control module harness
      • 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 greater than 4.5 V 
  13. Test or replace the component: B65 Intake Manifold Pressure and Air Temperature Sensor
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