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Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P149F, P208A-P208D, P214E, or P2C11 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    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: A38 Reductant Pump and Sensor Assembly
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 14 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: @K115 Reductant Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 14@Component harness & Terminal 36@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 less than 10 ohms 
  4. Disconnect the electrical connector: @K115 Reductant Control Module
  5. Test for less than 2 ohms between the test points:
    • Control circuit terminal 7@Component harness & Terminal 37@Control module harness
    • Control circuit terminal 8@Component harness & Terminal 24@Control module harness
    • Control circuit terminal 16@Component harness & Terminal 11@Control module harness
    • If greater than 2 ohms 

      Repair the open/high resistance in the circuit:

    • Go to next step: If less than 2 ohms 
  6. Test for infinite resistance between the test points:
    • Control circuit terminal 7@Component harness & Ground
    • Control circuit terminal 8@Component harness & Ground
    • Control circuit terminal 16@Component harness & Ground
    • If less than infinite resistance 

      Repair short to ground on the circuit.

    • Go to next step: If infinite resistance 
  7. Ignition - On/Vehicle - In Service Mode
  8. Test for less than 1 V between the test points:
    • Control circuit terminal 7@Component harness & Ground
    • Control circuit terminal 8@Component harness & Ground
    • Control circuit terminal 16@Component harness & Ground
    • If greater than 1 V 

      Repair the short to voltage on the circuit:

    • Go to next step: If less than 1 V 
  9. Replace the component: A38 Reductant Pump and Sensor Assembly
  10. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Replace the component: K115 Reductant Control Module

    • Go to next step: If the DTC is not set 
  11. All OK.
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