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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Engine Controls And Fuel - 1.4L (LV7) - DTC P0010 To DTC P0366) >> Diagnostic Information and Procedures >> DTC P0030-P0032, P0036-P0038, P0053, P0054, P0135, P0141, P103B, or P103C: HO2S Heater(s) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor, ignition ON.
  2. Verify that a test lamp illuminates between the ignition voltage circuit terminal 2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition/Vehicle - Off & Remove - 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 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 - 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, test all components connected to the fuse and replace as necessary.
    • If the test lamp illuminates 
  3. Verify DTC P103B, P103C is not set.
    • If a related DTC is set 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: B52A Heated Oxygen Sensor 1
    3. Disconnect the electrical connector: X1 @ K20 Engine Control Module
    4. Test for less than 2 ohms between the test points: Ignition circuit terminal 2 @ B52A Heated Oxygen Sensor 1 (harness side) & Terminal 26 X1 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component: K20 Engine Control Module
    • If a related DTC is not set 
  4. Verify that a test lamp does not illuminate between the ignition voltage circuit terminal 2 and the control circuit terminal 1.
    • 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 
  5. Remove the test lamp.
  6. Engine running, verify the scan tool HO2S 1 or 2 Heater Control Circuit Open Test Status parameter displays Malfunction.
    • If Malfunction is not displayed 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module. Ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
    • If Malfunction is displayed 
    7. NOTE:
    • Less than 10 Ω of additional resistance on the ignition voltage circuit or control circuit may set a DTC. If there is 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.
  7. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminal 1 and ground. Engine running.
  8. Verify the scan tool HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status parameter is Malfunction.
    • If Malfunction is not displayed 
    1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
    • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If less than 2 Ω, replace the K20 Engine Control Module.
    • If Malfunction is displayed 
  9. Test or replace the B52 Heated Oxygen Sensor.
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