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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (1 Of 5)) >> Diagnostic Information and Procedures >> DTC P007C-P007E or P10D6-P10D8 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
    2. NOTE:

    For component location, refer to: Repair Instructions

  2. Disconnect the appropriate electrical connector:
    • {P007C, P007D, P007E} B193A Charge Air Cooler Air Temperature Sensor - Inlet
    • {P10B6, P10B7, P10B8} B193B Charge Air Cooler Air Temperature Sensor - Outlet
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify the appropriate scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Colder than -39°C (-38°F)
    • If -39°C (-38°F) or warmer 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Test for infinite resistance between the test points:
    • Signal circuit terminal 1@Component harness & Ground
    • Signal circuit terminal 2@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K20 Engine Control Module
    • Go to next step: If colder than -39°C (-38°F) 
  5. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Ground
  6. Verify the scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Warmer than 214°C (417°F)
    • If 214°C (417°F) or colder 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 1@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 1@Component harness & The other end of the circuit@Control module harness
      • 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 warmer than 214°C (417°F) 
  7. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & Ground
  8. Verify the scan tool parameter: Charge Air Cooler Temperature Sensor or Charge Air Cooler Temperature Sensor 2 = Warmer than 214°C (417°F)
    • If 214°C (417°F) or colder 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the appropriate electrical connector: K20 Engine Control Module
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 2@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Signal circuit terminal 2@Component harness & The other end of the circuit@Control module harness
      • 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 warmer than 214°C (417°F) 
  9. Test or replace the component: B193A Charge Air Cooler Air Temperature Sensor - Inlet or B193B Charge Air Cooler Air Temperature Sensor - Outlet
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