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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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 High
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P0137
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-
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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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-
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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 greater 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
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
