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P0030




DTC P0030-P0032, P0036-P0038, P0053, P0054, P0135, or P0141

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 Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC P0030
- HO2S Heater Control Circuit Sensor 1

DTC P0031
- HO2S Heater Control Circuit Low Voltage Sensor 1

DTC P0032
- HO2S Heater Control Circuit High Voltage Sensor 1

DTC P0036
- HO2S Heater Control Circuit Sensor 2

DTC P0037
- HO2S Heater Control Circuit Low Voltage Sensor 2

DTC P0038
- HO2S Heater Control Circuit High Voltage Sensor 2

DTC P0053
- HO2S Heater Resistance Sensor 1

DTC P0054
- HO2S Heater Resistance Sensor 2

DTC P0135
- HO2S Heater Performance Sensor 1

DTC P0141
- HO2S Heater Performance Sensor 2

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 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, P0031, P0032, P0036, P0037 and P0038

* The engine speed is greater than 400 RPM.

* The ignition voltage is between 11-32 V.

* The DTCs run continuously when the above conditions are met for greater than 5 s.

P0053 and P0054

* DTCs P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119 or P2610 are not set.

* The ignition is OFF for greater than 8 h.

* The engine is running.

* 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 32 V.

* The DTCs run once per valid cold start-up when the above conditions are met.

P0135 and P0141

* DTCs P0116, P0117, P0118, P0119 or P0128 are not set.

* The system 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%.

* The DTCs run twice per drive cycle when the above conditions are met for greater than 30 s.

Conditions for Setting the DTC

P0030, P0031, P0032, P0036, P0037 and P0038

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

P0053 and P0054

The ECM detects the HO2S heater resistance is not within a specified range at engine start-up.

P0135 and P0141

The ECM detects the HO2S heater current is less than 0.30 A or greater than 2.5 A for greater than 8 s.

Action Taken When the DTC Sets

DTC P0030, P0031, P0032, P0036, P0037, P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.

Conditions for Clearing the DTC

DTC P0030, P0031, P0032, P0036, P0037, P0038, P0053, P0054, P0135, and P0141 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 will change from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.

* An open fuse in the heated oxygen sensor 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 [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left (D61)

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 References for scan tool information

Circuit/System Verification

1. Engine running.

2. Verify that the control circuit status parameters listed below do not display Malfunction.

* HO2S 1 or 2 Heater Control Circuit High Voltage Test Status

* HO2S 1 or 2 Heater Control Circuit Open Voltage Test Status

* HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status

• If Malfunction is displayed
Refer to Circuit/System Testing.

• If Malfunction is not displayed

3. Observe the scan tool HO2S 1 Heater or HO2S 2 Heater parameter. The amperage should be between 0.3-2.4 A.

• If not between 0.3-2.4 A
Refer to Circuit/System Testing.

• If between 0.3-2.4 A

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.

5. Verify the DTC does not set.

• If the DTC sets
Refer to Circuit/System Testing.

• If the DTC does not set

6. All OK.

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 appropriate B52 Heated Oxygen Sensor, ignition ON.

2. Verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.

2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, 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 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, replace the B52 Heated Oxygen Sensor.

• If the test lamp illuminates

3. Connect a test lamp between the control circuit terminal 2 and the ignition circuit terminal 1.

4. Verify the test lamp turns ON and OFF when Commanding the HO2S Heater Sensor ON and OFF with a scan tool.

• If the test lamp is always OFF

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

3. Ignition OFF.

4. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If the test lamp is always ON

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 turns ON and OFF

5. Test or replace the B52 Heated Oxygen Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Heated Oxygen Sensor Replacement - Sensor 1 Heated Oxygen Sensor Replacement - Sensor 1

* Heated Oxygen Sensor Replacement - Sensor 2 Heated Oxygen Sensor Replacement - Sensor 2

* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.

* Control Module References Control Module References for ECM replacement, programming and setup.

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