LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (3 Of 5)) >> Diagnostic Information and Procedures >> DTC P10D9, P20B9, P20BA-P20BC, P214F, or P21DD >> 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. Disconnect the electrical connector: A38 Reductant Pump and Sensor Assembly
  3. Ignition - On/Vehicle - In Service Mode
  4. Test for 2.5 to 4.5 V between the test points: Control circuit terminal 9 & Ground
    • If less than 2.5 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: @K115 Reductant Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 9 & 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 4@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
    • If greater than 4.5 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the electrical connector: @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 2.5 and 4.5 V 
  5. Connect a test lamp between the test points: Reductant Heater 1Control circuit terminal 11 & B+
  6. Ignition - On/Vehicle - In Service Mode
  7. Verify the test lamp does not turn On.
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: @K115 Reductant Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 11 @Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K115 Reductant Control Module
    • Go to next step: If the test lamp does not turn On 
  8. Connect a test lamp between the test points: Reductant Heater 1Control circuit terminal 11 & Ground
  9. Ignition - On/Vehicle - In Service Mode
  10. Verify the test lamp does not turn On.
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: @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 11 @Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 VK115 Reductant Control Module
    • Go to next step: If the test lamp does not turn On 
  11. Disconnect the electrical connector: @K115 Reductant Control Module
  12. Test for less than 2 ohms between the test points: Control circuit terminal 11@Component harness & Terminal 16@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
  13. Test or replace the component: A38 Reductant Pump and Sensor Assembly
scientia non olet · About LEMON Manuals