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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Data Communications System) >> Diagnostic Information and Procedures >> DTC U010C, U010E, U029D, U029E, or U02A3 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Use the wiring schematics and connector end views to identify the device's ground, ignition, and serial data circuit terminals.

U010E

  1. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect all the harness connectors at the K115 Reductant Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
    • If 10 Ω or greater 
    1. Ignition/Vehicle OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON/Vehicle In Service Mode.
  4. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition/Vehicle OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition/Vehicle OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K115 Reductant Control Module.
    • Go to next step: If the test lamp illuminates 
  5. Verify that a test lamp illuminates between each ignition circuit terminal listed below and ground.
    • Terminal 5
    • Terminal 8
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K115 Reductant Control Module.
    • Go to next step: If the test lamp illuminates 
  6. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connectors at the device setting the DTC. It may take up to 2 min for all vehicle systems to power down.
  7. Test for less than 2 Ω in each of the Powertrain high speed GMLAN serial data circuits end to end between the K115 Reductant Control Module and the device setting the DTC.
    • If 2 Ω or greater 

      Repair the open/high resistance in the serial data circuit between the K115 Reductant Control Module and the device setting the DTC.

    • Go to next step: If less than 2 Ω 
  8. Reconnect the harness connectors at the device setting the DTC.
  9. Test for 110 - 130 Ω between each pair of Powertrain high speed GMLAN serial data circuits at the K115 Reductant Control Module.
    • If less than 110 Ω 

      Refer to DTC U0074  to test for a short to ground or a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0074  to test for an open/high resistance in the serial data circuit.

    • Go to next step: If between 110 - 130 Ω 
  10. Replace the K115 Reductant Control Module.

U029D

  1. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connector at the B195A Nitrogen Oxides Sensor 1. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 6 and ground.
    • If 10 Ω or greater 
    1. Ignition/Vehicle OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON/Vehicle In Service Mode.
  4. Verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the B195A Nitrogen Oxides Sensor 1.
    • Go to next step: If the test lamp illuminates 
  5. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connectors of the device setting the DTC. It may take up to 2 min for all vehicle systems to power down.
  6. Test for less than 2 Ω in each of the Powertrain high speed GMLAN serial data circuits end to end between the B195A Nitrogen Oxides Sensor 1 and the device setting the DTC.
    • If 2 Ω or greater 

      Repair the open/high resistance in the serial data circuit between the B195A Nitrogen Oxides Sensor 1 and the device setting the DTC.

    • Go to next step: If less than 2 Ω 
  7. Reconnect the harness connectors at the device setting the DTC.
  8. Test for 110 - 130 Ω between each pair of Powertrain high speed GMLAN serial data circuits at the B195A Nitrogen Oxides Sensor 1.
    • If less than 110 Ω 

      Refer to DTC U0074  to test for a short to ground or a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0074  to test for an open/high resistance in the serial data circuit.

    • Go to next step: If between 110 - 130 Ω 
  9. Replace the B195A Nitrogen Oxides Sensor 1.

U029E

  1. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connector at the B195B Nitrogen Oxides Sensor 2. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 6 and ground.
    • If 10 Ω or greater 
    1. Ignition/Vehicle OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON/Vehicle In Service Mode.
  4. Verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the B195B Nitrogen Oxides Sensor 2.
    • Go to next step: If the test lamp illuminates 
  5. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connectors at the device setting the DTC. It may take up to 2 min for all vehicle systems to power down.
  6. Test for less than 2 Ω in each of the Powertrain high speed GMLAN serial data circuits end to end between the B195B Nitrogen Oxides Sensor 2 and the device setting the DTC.
    • If 2 Ω or greater 

      Repair the open/high resistance in the serial data circuit between the B195B Nitrogen Oxides Sensor 2 and the device setting the DTC.

    • Go to next step: If less than 2 Ω 
  7. Reconnect the harness connectors at the device setting the DTC.
  8. Test for 110 - 130 Ω between each pair of Powertrain high speed GMLAN serial data circuits at the B195B Nitrogen Oxides Sensor 2.
    • If less than 110 Ω 

      Refer to DTC U0074  to test for a short to ground or a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0074  to test for an open/high resistance in the serial data circuit.

    • Go to next step: If between 110 - 130 Ω 
  9. Replace the B195B Nitrogen Oxides Sensor 2.

U02A3

  1. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connector at the B136 Exhaust Particulate Matter Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition/Vehicle OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON/Vehicle In Service Mode.
  4. Verify that a test lamp illuminates between the ignition circuit terminal 6 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition/Vehicle OFF, remove the test lamp.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the B136 Exhaust Particulate Matter Sensor.
    • Go to next step: If the test lamp illuminates 
  5. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. Disconnect the harness connectors at the device setting the DTC. It may take up to 2 min for all vehicle systems to power down.
  6. Test for less than 2 Ω in each of the Powertrain high speed GMLAN serial data circuits end to end between the B136 Exhaust Particulate Matter Sensor and the device setting the DTC.
    • If 2 Ω or greater 

      Repair the open/high resistance in the serial data circuit between the B136 Exhaust Particulate Matter Sensor and the device setting the DTC.

    • Go to next step: If less than 2 Ω 
  7. Reconnect the harness connectors at the device setting the DTC.
  8. Test for 110 - 130 Ω between each pair of Powertrain high speed GMLAN serial data circuits at the B136 Exhaust Particulate Matter Sensor.
    • If less than 110 Ω 

      Refer to DTC U0074  to test for a short to ground or a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0074  to test for an open/high resistance in the serial data circuit.

    • Go to next step: If between 110 - 130 Ω 
  9. Replace the B136 Exhaust Particulate Matter Sensor.
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