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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Antilock Brake System - Hybrid (Hp4)) >> Diagnostic Information and Procedures >> DTC C05A3 or C05A4 >> Circuit/System Testing

Circuit/System Testing

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    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. Inspect the following components:
    • B5 Wheel Speed Sensor Correct part
    • B5 Wheel Speed Sensor = Visible Damage
    • If a condition exists 

      Replace the component:B5 Wheel Speed Sensor

    • Go to next step: If no conditions exist 
  2. Ignition/Vehicle & All vehicle systems - Off
  3. Disconnect the electrical connector:K17 Electronic Brake Control Module & B5 Wheel Speed Sensor
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for less than 1 V between the test points:
    • Signal circuit terminal 1 @ B5 Wheel Speed Sensor & Ground
    • Low Reference circuit terminal 2 @ B5 Wheel Speed Sensor & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  6. Ignition/Vehicle - Off
  7. Test for infinite resistance between the test points:
    • Signal circuit terminal 1 @ B5 Wheel Speed Sensor & Ground
    • Low Reference circuit terminal 2 @ B5 Wheel Speed Sensor & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  8. Test for less than 2 ohms between the test points:Signal circuit terminal 1 @ B5 Wheel Speed Sensor & The other end of the circuit @ Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  9. Test for less than 2 ohms between the test points:Signal circuit terminal 2 @ B5 Wheel Speed Sensor & The other end of the circuit @ Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  10. Replace the component:B5 Wheel Speed Sensor
  11. Verify the DTC does not set.
    • If the DTC sets 

      Replace the component:K17 Electronic Brake Control Module

    • Go to next step: If the DTC does not set 
  12. All OK.
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