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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (3 Of 5)) >> Diagnostic Information and Procedures >> DTC P10C9, P10CA, or P204B-P204E >> 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 20 ohms between the test points: Low Reference circuit terminal 3 & Ground
    • If 20 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 3@Component harness & Terminal 21@ 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 20 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. Test for 4.6 to 5.4 V between the test points: 5 V Reference circuit terminal 5 & Ground
    • If less than 4.6 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K115 Reductant Control Module
    3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 5@ 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: 5 V Reference circuit terminal 5@ Component harness & Terminal 19@ 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 5.4 V 
    1. Ignition/Vehicle - 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: 5 V Reference circuit terminal 5@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 4.6 and 5.4 V 
  6. Test for greater than 10 ohms between the test points: Signal circuit terminal 4 & Ground
    • If 10 ohms or less - Repair short to ground on the circuit.
    • Go to next step: If greater than 10 ohms
  7. Test for less than 1 V between the test points: Signal circuit terminal 4 & Low Reference circuit terminal 3
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  8. Test for 4.6 to 5.4 V between the test points: Signal circuit terminal 4 & 5 V Reference circuit terminal 5
    • If less than 4.6 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: K115 Reductant Control Module
    3. Test for less than 2 kohms between the test points: Signal circuit terminal 4@Component harness & Terminal 20@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 between 4.6 and 5.4 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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