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 provides 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
Typical Scan Tool Data
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. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors 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-P0032 or P0036-P0038
* The ignition voltage is greater than 11 V.
* The engine speed is greater than 400 RPM.
* The DTCs run continuously when the above conditions are met.
P0053 or P0054
* DTCs P0112, P0113, P0117, P0118, or P2610 are not set.
* The ignition voltage is less than 32 V.
* The engine run time is less than 0.22 s.
* The ignition is OFF for greater than 8 h.
* The engine coolant temperature (ECT) is between -30 to +45°C (-22 to +113°F) at engine start-up.
* The ECT and the intake air temperature (IAT) are within 8°C (14°F) at engine start-up.
* The DTCs run once per drive cycle when the above conditions are met.
P0135 or P0141
* DTCs P0116, P0117, P0118, P0125, or P0128 are not set.
* The ignition voltage is between 10-32 V.
* The HO2S is at operating temperature.
* The DTCs run twice per drive cycle with a 30 s delay between tests and a 1 s execution rate when the above conditions are met for 120 s.
Conditions for Setting the DTC
P0030 or P0036
The engine control module detects an open in the heater circuits of the HO2S when the heater is commanded OFF for greater than 6 s.
P0031 or P0037
The engine control module detects a short to ground in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 6 s.
P0032 or P0038
The engine control module detects a short to voltage in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded ON for greater than 6 s.
P0053 or P0054
The ECM detects the HO2S heater is not within a specified resistance range at engine start-up.
P0135 or P0141
The ECM detects that the HO2S heater current is greater than 2.5 A or less than 0.3 A for greater than 10 s.
Action Taken When the DTC Sets
DTCs P0030-P0032, P0036-P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0030-P0032, P0036-P0038, P0053, P0054, P0135, and P0141 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
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 the parameters listed below do not display Malfunction:
* HO2S 1 or 2 Heater Control Circuit Low Voltage Test Status
* HO2S 1 or 2 Heater Control Circuit Open Test Status
* HO2S 1 or 2 Heater Control Circuit High Voltage Test Status
• If Malfunction is displayed
Refer to Circuit/System Testing
• If Malfunction is not displayed
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing
• If the DTC does not fail
5. All OK.
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 2 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 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 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
4. Remove the test lamp.
5. Verify the scan tool HO2S 1 or 2 Heater Control Circuit High Voltage Test Status parameter is OK when commanding the HO2S Heater Sensor 1 or 2 ON with a scan tool.
• If OK 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 OK is displayed
Note:
* Less than 10 ohms 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 10 A fused jumper wire between the control circuit terminal 1 and the ignition voltage circuit terminal 2.
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 HO2S 1 or 2 Heater Control Circuit High Voltage Test Status parameter is Malfunction when commanding the HO2S Heater Sensor 1 or 2 ON with a scan tool.
• If Malfunction is not displayed
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. 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 Malfunction is displayed
8. 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 (LCV) Heated Oxygen Sensor Replacement - Sensor 1Heated Oxygen Sensor Replacement - Sensor 1 (LTG) Heated Oxygen Sensor Replacement - Sensor 1
* Heated Oxygen Sensor Replacement - Sensor 2 (LCV) Heated Oxygen Sensor Replacement - Sensor 2Heated Oxygen Sensor Replacement - Sensor 2 (LTG) Heated Oxygen Sensor Replacement - Sensor 2
* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing an Heated Oxygen Sensor.
* Control Module References Control Module References for Engine Control Module replacement, programming and setup