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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls And Fuel - 2.4L - DTC P0010 To DTC P0114 (LUK)) >> Diagnostic Information and Procedures >> DTC P0030, P0031, P0032, P0036, P0037, P0038, P0053, P0054, P0135, or P0141: HO2S Heater Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the appropriate B52Heated Oxygen Sensor. Ignition ON.
  2. Verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2Ω in the ignition circuit end to end.
    • If 2Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2Ω, 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 OFF.
    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, test all components connected to the fuse and replace as necessary.
    • If the test lamp illuminates 
  3. Verify that a test lamp does not illuminate between the ignition voltage circuit terminal D and the control circuit terminal indicated below.
    • HO2S 1 terminal C
    • HO2S 1 terminal E
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the control circuit and ground.
    • If less than infinite resistance, repair the short to ground on the circuit.
    • If infinite resistance, replace the K20 Engine Control Module.
    • If the test lamp does not illuminate 
  4. Remove the test lamp.
  5. Verify the scan tool HO2S1 or 2 Heater Control Circuit High Voltage Test Status parameter is OK when commanding the HO2S Heater ON with a scan tool.
    • If the parameter is not OK 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
    2. Test for less than 1V between the control circuit and ground.
    • If the parameter is OK 
    6. NOTE:
    • Less than 10Ω of additional resistance on the ignition voltage circuit or control circuit may set a DTC. If there is a resistance on a circuit, the driver will remain ON and the scan tool HO2S High Voltage Test Status parameter will display OK.
    • Performing this test may set additional DTCs.
  6. Install a 10A fused jumper wire between the control circuit terminal indicated below and the ignition voltage circuit terminal D.
    • HO2S 1 terminal C
    • HO2S 1 terminal E
    7. NOTE:

    This test may only be performed once per key cycle. If test is repeated, ignition OFF, allow the engine control module to shut down completely, then ignition ON.

  7. Verify the scan tool HO2S1 or 2 Heater Control Circuit High Voltage Test Status parameter is Malfunction when commanding the HO2S Heater ON with a scan tool.
    • If the parameter is not Malfunction 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2Ω in the control circuit end to end.
    • If 2Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2Ω, replace the K20 Engine Control Module.
    • If the parameter is Malfunction 
  8. Test or replace the B52Heated Oxygen Sensor.
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