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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Data Communication System - Diagnostic Information And Procedures (B1000 To U1833) >> Diagnostic Information And Procedures >> DTC U010C, U010E, U029D, U029E, Or U02A3: Lost Communication >> Circuit/System Testing

Circuit/System Testing

NOTE:

Use the wiring schematics and connector end views to identify the device's ground, B+, 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 10 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, remove the test lamp.
    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, remove the test lamp.
    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 terminals 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. Test for less than 4.5 V between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 4.5 V or greater 

      Refer to DTC U0076  to test for a short to voltage.

    • Go to next step: If less than 4.5 V 
  7. Ignition/Vehicle OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 10 min for all vehicle systems to power down.
  8. Test for greater than 100 Ω between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 100 Ω or less 

      Refer to DTC U0076  to test for a short to ground.

    • Go to next step: If greater than 100 Ω 
  9. Disconnect the harness connectors at the device setting the DTC.
  10. Test for less than 2 Ω in each Powertrain high speed GMLAN serial data circuit 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 
  11. Reconnect the harness connectors at the device setting the DTC.
  12. 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 U0076  to test for a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0076  to test for an open/high resistance in the serial data circuit.

    • Go to next step: If between 110 - 130 Ω 
  13. 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 10 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. Test for less than 4.5 V between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 4.5 V or greater 

      Refer to DTC U0076  to test for a short to voltage.

    • Go to next step: If less than 4.5 V 
  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. It may take up to 10 min for all vehicle systems to power down.
  7. Test for greater than 100 Ω between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 100 Ω or less 

      Refer to DTC U0076  to test for a short to ground.

    • Go to next step: If greater than 100 Ω 
  8. Disconnect the harness connectors at the device setting the DTC.
  9. Test for less than 2 Ω in each Powertrain high speed GMLAN serial data circuit 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 
  10. Reconnect the harness connectors at the device setting the DTC.
  11. 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 U0076  to test for a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0076  to test for an open/high resistance in the serial data circuit.

    • Go to next step: If between 110 - 130 Ω 
  12. 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 10 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. Test for less than 4.5 V between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 4.5 V or greater 

      Refer to DTC U0076  to test for a short to voltage.

    • Go to next step: If less than 4.5 V 
  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. It may take up to 10 min for all vehicle systems to power down.
  7. Test for greater than 100 Ω between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 100 Ω or less 

      Refer to DTC U0076  to test for a short to ground.

    • Go to next step: If greater than 100 Ω 
  8. Disconnect the harness connectors at the device setting the DTC.
  9. Test for less than 2 Ω in each Powertrain high speed GMLAN serial data circuit 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 
  10. Reconnect the harness connectors at the device setting the DTC.
  11. 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 U0076  to test for a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0076  to test for an open/high resistance in the serial data circuit.

    • Go to next step: If between 110 - 130 Ω 
  12. 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 10 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. Test for less than 4.5 V between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 4.5 V or greater 

      Refer to DTC U0076  to test for a short to voltage.

    • Go to next step: If less than 4.5 V 
  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. It may take up to 10 min for all vehicle systems to power down.
  7. Test for greater than 100 Ω between each Powertrain high speed GMLAN serial data circuit terminal and ground.
    • If 100 Ω or less 

      Refer to DTC U0076  to test for a short to ground.

    • Go to next step: If greater than 100 Ω 
  8. Disconnect the harness connectors at the device setting the DTC.
  9. Test for less than 2 Ω in each Powertrain high speed GMLAN serial data circuit 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 
  10. Reconnect the harness connectors at the device setting the DTC.
  11. 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 U0076  to test for a short between the serial data circuits.

    • If greater than 130 Ω 

      Refer to DTC U0076  to test for an open/high resistance in the serial data circuit.

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