Circuit/System Testing

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.