P0155
DTC P0030-P0032, P0036-P0038, P0050-P0054, P0056-P0060, P0135, P0141, P0155, or P0161
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 Bank 1 Sensor 1
DTC P0031
- HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 1
DTC P0032
- HO2S Heater Control Circuit High Voltage Bank 1 Sensor 1
DTC P0036
- HO2S Heater Control Circuit Bank 1 Sensor 2
DTC P0037
- HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
DTC P0038
- HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
DTC P0050
- HO2S Heater Control Circuit Bank 2 Sensor 1
DTC P0051
- HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1
DTC P0052
- HO2S Heater Control Circuit High Voltage Bank 2 Sensor 1
DTC P0053
- HO2S Heater Resistance Bank 1 Sensor 1
DTC P0054
- HO2S Heater Resistance Bank 1 Sensor 2
DTC P0056
- HO2S Heater Control Circuit Bank 2 Sensor 2
DTC P0057
- HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 2
DTC P0058
- HO2S Heater Control Circuit High Voltage Bank 2 Sensor 2
DTC P0059
- HO2S Heater Resistance Bank 2 Sensor 1
DTC P0060
- HO2S Heater Resistance Bank 2 Sensor 2
DTC P0135
- HO2S Heater Performance Bank 1 Sensor 1
DTC P0141
- HO2S Heater Performance Bank 1 Sensor 2
DTC P0155
- HO2S Heater Performance Bank 2 Sensor 1
DTC P0161
- HO2S Heater Performance Bank 2 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, P0036-P0038, P0050-P0052, or P0056-P0058
* The ignition voltage is between 11-32 V.
* The engine speed is greater than 400 RPM.
* The DTCs run continuously when the above conditions are met.
P0053, P0054, P0059, or P0060
* DTCs P0112, P0113, P0117, P0118, or P2610 are not set.
* The engine run time is greater than 20 s.
* The ignition voltage is less than 18 V.
* 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, P0141, P0155, or P0161
* 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 HO2S is commanded ON.
* The DTCs run once per drive cycle when the above conditions are met for 120 s.
Conditions for Setting the DTC
P0030, P0036, P0050, or P0056
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.
P0031, P0037, P0051, or P0057
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 13 s.
P0032, P0038, P0052, or P0058
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 13 s.
P0053, P0054, P0059, or P0060
The ECM detects the HO2S heater is not within a specified resistance range at engine start-up.
P0135 or P0155
The ECM detects that the HO2S 1 heater current is greater than 3.1 amps, or less than 0.3 amps for greater than 8 s.
P0141 or P0161
The ECM detects that the HO2S 2 heater current is greater than 2.9 amps, or less than 0.3 amps for greater than 8 s.
Action Taken When the DTC Sets
DTCs P0030-P0032, P0036-P0038, P0050-P0052, P0053, P0054, P0056-P0058, P0059, P0060, P0135, P0141. P0155, and P0161 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0030-P0032, P0036-P0038, P0050-P0052, P0053, P0054, P0056-P0058, P0059, P0060, P0135, P0141. P0155, and P0161 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics ((LFX)) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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. Ignition ON, command the appropriate HO2S Heater Bank 1 or 2 Sensor 1 or 2 ON and OFF with a scan tool while observing the HO2S Heater Control Circuit High Voltage, Open, and Low Voltage Test Status Bank 1 or 2 Sensor 1 or 2 parameters. The parameters should display OK or Not Run.
2. Engine idling at operating temperature, observe the scan tool HO2S Heater parameter. The amperage should be within 0.2-2 A.
3. Engine idling at operating temperature, move the related wiring and connectors while observing the HO2S Heater parameter with a scan tool. The parameter should not change with movement.
• If movement affects the parameter, repair the appropriate harness or connector.
4. 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 you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S.
2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal indicated below and ground.
* HO2S Bank 1 or 2 Sensor 1 terminal D
* HO2S Bank 1 Sensor 2 terminal C
* HO2S Bank 2 Sensor 2 terminal D, Manual Transmission
* HO2S Bank 2 Sensor 2 terminal C, Automatic Transmission
• If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B52 HO2S heater circuit fuse is open, test all components connected to the fuse and replace as necessary.
3. Ignition ON, observe the appropriate scan tool HO2S Heater Control Circuit Open Test Status Bank 1 or 2 Sensor 1 or 2 parameter. The parameter should display Malfunction.
• If not the specified value, test the heater control circuit terminal indicated below for a short to ground, or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
* HO2S Bank 1 or 2 Sensor 1 terminal E
* HO2S Bank 1 Sensor 2 terminal D
* HO2S Bank 2 Sensor 2 terminal C, Manual Transmission
* HO2S Bank 2 Sensor 2 terminal D, Automatic Transmission
4. Connect a 3 A fused jumper wire between the heater control circuit terminal indicated below and ground. Observe the appropriate scan tool HO2S Heater Control Circuit Low Voltage Test Status parameter. The parameter should transition from OK to Malfunction.
* HO2S Bank 1 or 2 Sensor 1 terminal E
* HO2S Bank 1 Sensor 2 terminal D
* HO2S Bank 2 Sensor 2 terminal C, Manual Transmission
* HO2S Bank 2 Sensor 2 terminal D, Automatic Transmission
• If not the specified value, test the heater control circuit terminal indicated below for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
* HO2S Bank 1 or 2 Sensor 1 terminal E
* HO2S Bank 1 Sensor 2 terminal D
* HO2S Bank 2 Sensor 2 terminal C, Manual Transmission
* HO2S Bank 2 Sensor 2 terminal D, Automatic Transmission
Note:
* Less than 10 ohms 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.
5. Ignition OFF, connect a 10 A fused jumper wire between the control circuit terminal and the ignition voltage circuit terminal indicated below.
* HO2S Bank 1 or 2 Sensor 1 between terminals E and D
* HO2S Bank 1 Sensor 2 between terminals D and C
* HO2S Bank 2 Sensor 2 between terminals C and D, Manual Transmission
* HO2S Bank 2 Sensor 2 between terminals D and C, Automatic Transmission
6. Engine idling, observe the appropriate HO2S Control Circuit High Voltage Test Status Bank 1 or 2 Sensor 1 or 2 parameter. The parameter should transition from Not Run to Malfunction.
• If not the specified value, test the control circuit and the ignition voltage circuit for high resistance. If the circuits test normal, replace the K20 ECM.
7. If all circuits test normal, test or replace the appropriate B52 HO2S.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 Heated Oxygen Sensor Replacement - Bank 1 Sensor 1
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 Heated Oxygen Sensor Replacement - Bank 1 Sensor 2
* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 Heated Oxygen Sensor Replacement - Bank 2 Sensor 1
* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 Heated Oxygen Sensor Replacement - Bank 2 Sensor 2
* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing an HO2S.
* Control Module References Control Module References for ECM replacement, programming and setup.