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Home >> Chevrolet >> 2020 >> Trax LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.8L (2H0) >> Diagnostic Information and Procedures >> DTC P0101-P0103 >> Circuit/System Testing

Circuit/System Testing

    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.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: B75B Mass Air Flow/Intake Air Temperature Sensor
  3. Test for less than 2 ohms between the test points: Ground circuit terminal 2 & Ground
    • If 2 ohms or greater 
    1. Disconnect the ground connection: G106
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 2 @ Component harness & Ground terminal G106
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 2 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify a test lamp turns On between the test points: Ignition circuit terminal 4 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: Ignition circuit terminal 4 @ Control module harness & Output terminal @ Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off
    2. Replace the component: Fuse
    3. Ignition - On / Vehicle - In Service Mode
    4. Verify the fuse does not open.
      • If the fuse opens and there are components connected to the circuit - Disconnect a component and repeat procedure starting at step 5.1-5.4
      • If the fuse opens with all components disconnected from the circuit - Repair the short to ground on the circuit.
      • If the fuse does not open after disconnecting a component from the circuit - Replace the component disconnected last.
      • Go to next step: If the fuse does not open with all components connected, except the following component: K20 Engine Control Module
    5. Ignition/Vehicle - Off
    6. Connect the electrical connector: K20 Engine Control Module
    7. Replace the component: Fuse
    8. Ignition - On / Vehicle - In Service Mode
    9. Verify the fuse does not open.
      • If the fuse is open - Replace the component: K20 Engine Control Module
      • Go to next step: If the fuse does not open.
      10. NOTE:

      It may be necessary to use a scan tool control function to operate a component.

    10. Operate the component: Each component on the circuit - One at a time

      Verify the fuse does not open when any of the components are activated.

      • If the fuse opens - Replace the component that caused the fuse to open when activated.
      • Go to next step: If the fuse does not open.
    11. All OK.
    • Go to next step: If the test lamp turns On 
  6. Test for 4.8 to 5.2V between the test points: Signal circuit terminal 5 & Ground
    • 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: Signal circuit terminal 5 @ B75B Mass Air Flow/Intake Air Temperature Sensor & 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 5 @ B75B Mass Air Flow/Intake Air Temperature Sensor & The other end of the circuit @ K20 Engine Control Module
      • 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 1V between the test points: Signal circuit terminal 5 @ B75B Mass Air Flow/Intake Air Temperature Sensor & Ground
      • If 1V or greater - Repair the short to voltage on the circuit.
      • If less than 1V - Replace the component: K20 Engine Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  7. Replace the component: B75B Mass Air Flow/Intake Air Temperature Sensor
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