P0030
DTC P0030, P0053, or P0135 (LUW)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovide an overview of each diagnostic category.
DTC Descriptors
DTC P0030
- HO2S Heater Control Circuit Sensor 1
DTC P0053
- HO2S Heater Resistance Sensor 1
DTC P0135
- HO2S Heater Performance Sensor 1
Diagnostic Fault Information
Circuit/System Description
Heated oxygen sensors (HO2S) are used for fuel control and post-catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. Each HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside each of the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit, through a low side driver within the engine control module (ECM). The ECM uses pulse-width modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
Conditions for Running the DTC
P0030
* The engine is cranking or running.
* The ignition voltage is between 11-32 V.
* The engine speed is greater than 400 RPM.
P0053
* DTCs P0112, P0113, P0114, P0117, P0118, P0119 or P2610 are not set.
* The ignition is OFF for greater than 8 h.
* The engine coolant temperature (ECT) and the intake air temperature (IAT) are within 8°C (14°F).
* The ECT is between -30 to +45°C (-22 to +113°F).
* The ignition voltage is less than 31.9 V.
P0135
* DTCs P0117, P0118 or P0119 are not set.
* The ignition voltage is between 10-32 V.
* The HO2S heaters are at operating temperature.
* The scan tool HO2S Heater device control is not active.
* The commanded HO2S heater duty cycle is greater than 0%.
Conditions for Setting the DTC
P0030
The ECM detects that the commanded state of the driver in the actual state of the control circuit do not match.
P0053
The ECM detects the HO2S heater resistance is less than 7.5 ohm or greater than 13 ohm.
P0135
The ECM detects the HO2S heater current is less than 0.30 A or greater than 2.5 A.
Action Taken When the DTC Sets
DTC P0030, P0053, P0135 are Type B DTCs.
Conditions for Clearing the DTC
DTC P0030, P0053, P0135 are Type B DTCs.
Diagnostic Aids
* If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit status parameters for the component. The circuit status parameters change from OK or Not Run to Fault if there is a condition with the circuit or a connection.
* An open fuse in the HO2S heater circuit may be caused by the heater element in one of the sensors. The condition may not be present until the sensor operates for a period of time. If no fault is present in the heater circuit, monitor the amperage of each heater with a scan tool to determine if one of the heater elements is the cause of the open fuse. Inspect the sensor pigtail or the harness for contacting the exhaust system.
Reference Information
Schematic Reference
Engine Controls Schematics (LUW) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module Referencesfor scan tool information
Circuit/System Verification
1. Clear the DTCs with a scan tool.
2. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that are captured in the freeze frame/failure records data.
Circuit/System Testing
Note: You must perform the circuit/system verification before proceeding with circuit/system testing.
1. Ignition OFF, disconnect the harness connector at the B52A Heated Oxygen Sensor 1.
2. Ignition ON, test for B+ between the B52A Heated Oxygen Sensor 1 ignition voltage circuit terminal 1 and ground.
• If less than the specified range, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition voltage circuit and replace as necessary.
3. Connect a test lamp between the heater control circuit terminal 2 and B+. The test lamp should not illuminate.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit test normal, replace the K20 Engine Control Module.
4. Idle the engine, and verify the test lamp illuminates or flashes.
• If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit/connections test normal, replace the K20 Engine Control Module.
5. If all circuits test normal, test or replace the B52A Heated Oxygen Sensor 1.
Component Testing
Static Test
1. Ignition OFF, disconnect the harness connector at the B52A Heated Oxygen Sensor 1.
2. Test for 7.5-13 ohm between the B52A Heated Oxygen Sensor 1 ignition voltage circuit terminal 1 and the control circuit terminal 2.
• If not within the specified range, replace the B52A Heated Oxygen Sensor 1.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Heated Oxygen Sensor Replacement - Sensor 1 (LDE, LXV, LUW, 2H0) Heated Oxygen Sensor Replacement - Sensor 1
* Control Module References Control Module Referencesfor ECM replacement, programming and setup.