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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 P1018, P1019, P131B, P131C, P203B-P203D, P206B-P206D, P21C5, P2ADA-P2ADD, U2627, U2628, or U2630 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    Reductant Tank Temperature Sensor 2 is an integrated temperature sensor internal to the B212 Reductant Sensor Module, which uses serial data communication for quality, level, and temperature data.

  1. Ignition Off, disconnect the harness connector at the B212 Reductant Sensor Module.
  2. Test for less than 10 Ω between low reference terminal 3 and ground.
    • If greater than 10 Ω 
    1. Ignition Off, disconnect the harness connector at the K115 Reductant Control Module.
    2. Test for less than 2 Ω between low reference terminal 3 at the component harness and terminal 9 at the control module harness.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K115 Reductant Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition - On/Vehicle - In Service Mode
  4. Test for 4.6 to 5.4 V between 5 V reference circuit terminal 1 and ground
    • If less than 4.6 V 
    1. Ignition Off, disconnect the harness connector at the K115 Reductant Control Module.
    2. Test for less than 2 Ω between 5 V reference terminal 1 at the component harness and terminal 7 at the control module harness.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    3. Test for infinite resistance between the 5 V reference terminal 1 at the component harness and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K115 Reductant Control Module
    • If greater than 5.4 V 
    1. Ignition Off, disconnect the harness connector at the K115 Reductant Control Module.
    2. Ignition - On/Vehicle - In Service Mode
    3. Test for less than 1 V between the 5 V reference terminal 1 at the component harness and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K115 Reductant Control Module
    • Go to next step: If between 4.6 and 5.4 V 
  5. Ignition - On/Vehicle - In Service Mode
  6. Test for 4.8 to 5.2 V between serial data circuit terminal 2 and ground.
    • If less than 4.8 V 
    1. Ignition Off, disconnect the harness connector at the K115 Reductant Control Module.
    2. Test for less than 2 Ω in between serial data circuit terminal 2 at the component harness and terminal 8 at the control module harness.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    3. Test for infinite resistance between the serial data circuit terminal 2 at the component harness and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K115 Reductant Control Module
    • If greater than 4.8 V 
    1. Ignition Off, disconnect the harness connector at the K115 Reductant Control Module.
    2. Ignition - On/Vehicle - In Service Mode
    3. Test for less than 1 V between the serial data circuit terminal 2 at the component harness and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K115 Reductant Control Module
    • Go to next step: If between 4.4 and 4.8 V 
  7. Replace the component: B212 Reductant Sensor Module.
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