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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 P017B-P017D, P117F, P14C0, or P2C3A-P2C3D >> 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: B96 Cylinder Head Temperature Sensor
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 1 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: X1@K20 Engine Control Module
    2. Test for less than 2 ohms between the test points: Low Reference 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 less than 10 ohms 
  4. Ignition - On/Vehicle - In Service Mode
  5. Verify the scan tool parameter:
    • Cylinder Head Temperature Sensor = Colder than -39°C (-38°F)
    • Cylinder Head Temperature Sensor 2 = Colder than -39°C (-38°F)
    • If warmer than -39°C (-38°F) 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X2@K20 Engine Control Module
    3. Test for infinite resistance between the test points:
      • Signal circuit terminal 2@Component harness & Ground
      • Signal circuit terminal 3@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) 
  6. Connect a 3 A fused jumper wire between the test points: - One at a time
    • Signal circuit terminal 2 & Low Reference circuit terminal 1
    • Signal circuit terminal 3 & Low Reference circuit terminal 1

      Verify the scan tool parameter:

    • Cylinder Head Temperature Sensor = Warmer than 139°C (282°F)
    • Cylinder Head Temperature Sensor 2 = Warmer than 139°C (282°F)
    • If colder than 139°C (282°F) 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X2@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
      • Signal circuit terminal 3@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
      • Signal circuit terminal 3@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 139°C (282°F) 
  7. Replace the component: B96 Cylinder Head Temperature Sensor
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