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Home >> Chevrolet >> 2019 >> Cruze Premier, 4D Hatchback >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P057B-P208D)) >> Diagnostic Information and Procedures >> DTC P10DA-P10DD or P21CB (Notchback) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Remove the component: KR121A Reductant Control Module Relay 1
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points: B+ circuit terminal 87 & 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 87 @ Relay Socket & Output terminal @ F55UA Fuse
      • If 2 ohms or greater - Replace the component: X50A Fuse Block - Underhood
      • 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 87 & Ground
      • If less than infinite resistance - Replace the component: X50A Fuse Block - Underhood
      • Go to next step: If infinite resistance
    3. Disconnect the electrical connector: X1 @ K115 Reductant Control Module
    4. Test for infinite resistance between the test points: Control circuit terminal 30 @ Relay Socket & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    5. Replace the component: F55UA Fuse
    6. Install the component: KR121A Reductant Control Module Relay 1
    7. Ignition - On/Vehicle - In Service Mode
    8. Verify a test lamp turns On between the test points: Ignition circuit terminal 8 @ K115 Reductant Control Module & Ground
      • If the test lamp does not turn On - Replace the component: KR121A Reductant Control Module Relay 1
      • If the test lamp turns On - Replace the component: K115 Reductant Control Module
    • Go to next step: If the test lamp turns On 
  5. Ignition/Vehicle - Off
  6. Connect the electrical connector: X1 @ K115 Reductant Control Module
  7. Disconnect the electrical connector: @ A38 Reductant Pump and Sensor Assembly
  8. Ignition - On/Vehicle - In Service Mode
  9. Test for 5 to 7.5 V between the test points: Control circuit terminal 9 @ Component harness & Ground
    • If less than 5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X2 @ K115 Reductant Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 9 @ 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: Control circuit terminal 9 @ Component harness & Terminal 11 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K115 Reductant Control Module
    • Go to next step: If greater than 7.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X2 @ K115 Reductant Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 9 @ Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • If less than 1 V - Replace the component: K115 Reductant Control Module
    • Go to next step: If between 5 and 7.5 V 
  10. Connect a test lamp between the test points: Control circuit terminal 9 & Control circuit terminal 11 @ A38 Reductant Pump and Sensor Assembly (harness side)
  11. Ignition - On/Vehicle - In Service Mode
  12. Perform the scan tool control function: Reductant Heater 1 - On
    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X2 @ K115 Reductant Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 11 @ A38 Reductant Pump and Sensor Assembly (harness side) & 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: Control circuit terminal 11 @ A38 Reductant Pump and Sensor Assembly (harness side) & Terminal 4 @ 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
    5. Ignition - On/Vehicle - In Service Mode
    6. Test for less than 1 V between the test points: Control circuit terminal 11 @ A38 Reductant Pump and Sensor Assembly (harness side) & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K115 Reductant Control Module
    • Go to next step: If the test lamp turns On and Off 
  13. Test or replace the component: A38 Reductant Pump and Sensor Assembly
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