DTC P0036, P0037, P0038, or P0141 (LDK with Turbocharger)
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DTC P0036, P0037, P0038, or P0141 (LDK with Turbocharger)
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions provides an overview of each diagnostic category.
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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 P0141
HO2S Heater Performance Sensor 2
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Signal Performance
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HO2S 2 Heater Voltage Supply
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Opens Fuse
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P0036, P0037, P0141
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-
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P0141
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HO2S 2 Heater Low Control
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P0036, P0037
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P0036, P0037, P0141
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P0036, P0038, P0141
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P0141
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HO2S 2 Signal Hi
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P0137
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P0138
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HO2S 2 Reference Ground
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-
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-
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Circuit/System Description
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Heated oxygen sensors (HO2S) are used for fuel control and post-catalyst monitoring. The HO2S 2 compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S 2 must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S 2 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 2 heater low control circuit, through a low side driver within the Engine Control Module (ECM). The ECM uses pulse-width modulation to control the HO2S 2 heater operation to maintain a specific HO2S 2 operating temperature range.
P0036
The ECM monitors the voltage on the HO2S 2 heater low control circuit for heater fault diagnosis. If the ECM detects that the HO2S 2 heater low control circuit voltage is not within a specified range, DTC P0036 sets.
P0037
The ECM monitors the voltage on the HO2S 2 heater low control circuit for heater fault diagnosis. If the ECM detects that the HO2S 2 heater low control circuit voltage is below a specified range, DTC P0037 sets.
P0038
The ECM monitors the voltage on the HO2S 2 heater low control circuit for heater fault diagnosis. If the ECM detects that the HO2S 2 heater low control circuit voltage is above a specified range, DTC P0038 sets.
P0141
If the ECM detects that the heater current is not within the expected range, DTC P0141 sets.
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Conditions for Running the DTC
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P0036, P0037, and P0038
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The Ignition 1 Signal parameter is between 10-18 V.
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The engine speed is more than 80 RPM.
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DTC P0036, P0037, and P0038 run continuously when the above conditions are met for 1 s.
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P0141
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DTCs P0036, P0037, P0038, P0121, P0122, P0123, P0137, P0138, P0140, P0221, P0222, P0223, P0335, P0336, P0338, P2232, P2271, P2271 are not set.
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The Ignition 1 Signal parameter is between 10-18 V.
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The modeled exhaust gas temperature is between 360-500°C (680-932°F).
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The engine off soak time is greater than 120 s.
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The engine is not in decel fuel cut-off.
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The intake air temperature (IAT) is greater than -30°C (-22°F).
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DTC P0141 runs continuously.
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Conditions for Setting the DTC
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P0036, P0037, and P0038
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The ECM detects that the difference between the expected and the actual HO2S 2 heater low control circuit voltage is more than a calibrated value.
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DTCs P0036, P0037, and P0038 set when the above condition is met for 4 s continuously, or for 50 s cumulatively.
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P0141
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The ECM detects that the HO2S 2 heater current is more than 2.5 A or less than 0.25 A.
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DTC P0141 sets within 30 s when the above condition is met.
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Action Taken When the DTC Sets
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DTC P0036, P0037, P0038, P0141 are Type B DTCs.
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Conditions for Clearing the MIL/DTC
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DTC P0036, P0037, P0038, P0141 are Type B DTCs.
Schematic Reference
PSD SIE TITLE Error: SIE linked to empty Cell ID 16132
Connector End View Reference
PSD SIE TITLE Error: SIE linked to empty Cell ID 164814
Electrical Information Reference
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Testing for Intermittent Conditions and Poor Connections
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Heated Oxygen Sensor Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
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Circuit/System Verification
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1.
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Clear the DTCs with a scan tool.
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2.
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Operate the vehicle within the conditions to run and set the DTC. The DTC should not be set.
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3.
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Run the vehicle within the Conditions for Running the DTCs. You may also operate the vehicle within the conditions that you have noted from the Freeze Frame/Failure Records data.
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Note
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You must perform the circuit/system verification before proceeding with circuit/system testing.
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1.
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Ignition OFF, disconnect the harness connector at the B52B HO2S 2.
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2.
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Ignition ON, verify that a test lamp illuminates between the voltage circuit terminal D and ground.
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3.
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If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse is open, test all components connected to the fuse and replace as necessary.
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4.
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Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C and the voltage circuit terminal D.
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5.
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If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
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6.
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Engine running, leave the test lamp connected from the previous step. The lamp should flash or be ON steady after 10 s.
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7.
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If the test lamp is not ON steady or flashing, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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8.
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If the K20 ECM and all circuits test normal, replace the B52B HO2S 2.
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Refer to Heated Oxygen Sensor Resistance Learn Reset Caution.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Heated Oxygen Sensor Replacement - Sensor 1
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Heated Oxygen Sensor Replacement - Sensor 2
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Control Module References for ECM replacement, setup, and programming
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