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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Battery, Starting System And Charging System - Except Hybrid) >> Diagnostic Information and Procedures >> Stop/Start System Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
    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:T19 Power Supply Transformer
  3. Test for less than 10 ohms between the test points:
    • Ground circuit terminal 7 & Ground
    • Ground circuit terminal 12 & Ground
    • If 10 ohms or greater 
  4. Ignition/Vehicle & All vehicle systems - Off
    1. Disconnect the ground connection: @ The other end of the circuit
    2. Test for less than 2 ohms between the test points:
      • Ground circuit terminal 7 & The other end of the circuit
      • Ground circuit terminal 12 & 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 
  5. Ignition - On / Vehicle - In Service Mode
  6. 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:Each B+ circuit terminal & 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 & Remove - Test lamp
    2. Test for infinite resistance between the test points:Each B+ circuit terminal & Output terminal @ Fuse
      • 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. Verify a test lamp turns On between the test points:Ignition circuit terminal 6 & 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 & 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 & Remove - Test lamp
    2. Test for infinite resistance between the test points:Ignition circuit terminal 6 & Output terminal @ Fuse
      • 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 
  8. Connect a test lamp between the test points:Terminal 5 @ T19 Power Supply Transformer & Ground
  9. Ignition Mode = Engine Starting
  10. Verify the test lamp turns On.
    • If the test lamp does not turn On 
  11. Ignition Off - Remove - Test Lamp
  12. Disconnect the electrical connector:X1 @ K20 Engine Control Module
    1. Test for infinite resistance between the test points:Terminal 5 @ T19 Power Supply Transformer & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
  13. Test for less than 2 ohms between the test points:Terminal 5 @ T19 Power Supply Transformer & 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
    • Go to next step: If the test lamp turns On 
  14. Replace the component:T19 Power Supply Transformer
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