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HOMESERVICE MANUALSCHEVROLET2019TRAX PREMIER, AWDREPAIR AND DIAGNOSISENGINE MECHANICALSTARTERBATTERY, CHARGING SYSTEM AND STARTING SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC P3051, P3053, OR P3055CIRCUIT/SYSTEM TESTING
2019 Chevrolet Trax Premier, AWD

Circuit/System Testing

2019 Chevrolet Trax Premier, AWDSECTION Circuit/System Testing
NOTE:

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

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:T19 Power Supply Transformer
  3. Test for less than 10 ohms between the test points:
    • Ground circuit terminal 7 @ T19 Power Supply Transformer & Ground
    • Ground circuit terminal 12 @ T19 Power Supply Transformer & Ground
    • If 10 ohms or greater 
    1. Disconnect the appropriate ground connection:
    2. Test for less than 2 ohms between the test points:Each ground circuit terminal @ T19 Power Supply Transformer & The other end of the circuit
      • 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 10 ohms 
  4. Verify a test lamp turns On between the test points:
    • B+ circuit terminal 8 @ T19 Power Supply Transformer & Ground
    • B+ circuit terminal 11@ T19 Power Supply Transformer & 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:
      • B+ circuit terminal 8 @ T19 Power Supply Transformer & Output terminal @ Fuse
      • B+ circuit terminal 11 @ T19 Power Supply TransformerOutput 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 & Remove - Test lamp
    2. Test for infinite resistance between the test points:
      • B+ circuit terminal 8 @ T19 Power Supply Transformer & Ground
      • B+ circuit terminal 11 @ T19 Power Supply Transformer & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:T19 Power Supply Transformer
    • Go to next step: If the test lamp turns On 
  5. Ignition - On/Vehicle - In Service Mode
  6. Verify a test lamp turns On between the test points:Ignition circuit terminal 6 @ T19 Power Supply Transformer & 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 6 @ T19 Power Supply Transformer & KR73 Ignition Main Relay
      • 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 & Remove - Test lamp
    2. Test for infinite resistance between the test points: Ignition circuit terminal 6 @ T19 Power Supply Transformer & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:T19 Power Supply Transformer
    • Go to next step: If the test lamp turns On 
  7. Ignition Off
  8. Verify a test lamp does not turn On between the test points:Ignition circuit terminal 6 @ T19 Power Supply Transformer & Ground
    • If the test lamp turns On 

      Repair the short to voltage on the circuit.

    • Go to next step: If the test lamp does not turn On 
  9. Ignition/Vehicle - Off & Remove - Test lamp
  10. Connect all electrical connectors.
  11. Clear DTCs
  12. Operate the vehicle under the following conditions:Autostart/Autostop
  13. Verify DTC P3051, P3053, P3055 is not set.
    • If any of the DTCs are set 

      Test or replace the component:T19 Power Supply Transformer

    • Go to next step: If no DTC is set 
  14. All OK.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.