DTC P0137, P0138, P0140, P2232, P2270, or P2271 (LDK with Turbocharger)
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DTC P0137, P0138, P0140, P2232, P2270, or P2271 (LDK with Turbocharger)
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DTC P0137
HO2S Circuit Low Voltage Sensor 2
DTC P0138
HO2S Circuit High Voltage Sensor 2
DTC P0140
HO2S Circuit Insufficient Activity Sensor 2
DTC P2232
HO2S Signal Circuit Shorted to Heater Circuit Sensor 2
DTC P2270
HO2S Signal Stuck Lean Sensor 2
DTC P2271
HO2S Signal Stuck Rich 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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-
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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. 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. Heating elements inside the HO2S minimize the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the ECM operates in Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and Closed Loop is achieved, the HO2S generates a voltage within a range of 0-1,000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.
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Conditions for Running the DTC
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P0137 Lean Test Enable
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DTCs P0116, P0117, P0118, P0119, P0125 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 temp model is more than 250°C (482°F) for at least 90 s.
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The estimated exhaust temperature is less than 800°C (1,472°F).
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The time after engine start is less than 5.1 s.
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The engine coolant is more than 60°C (140°F) after last engine shut-down.
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The engine coolant at start is less than 40°C (104°F).
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DTC P0137 runs once per drive cycle when the above conditions are met for 2 s.
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P0138 Rich Test Enable
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DTCs P0116, P0117, P0118, P0119, P0125 are not set.
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The Fuel Control Loop Status parameter is Closed.
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The Ignition 1 Signal parameter is between 10-18 V.
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The modeled exhaust gas temp model is more than 250°C (482°F) for at least 90 s.
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The estimated exhaust temperature is less than 800°C (1,472°F).
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DTC P0138 runs the rich test continuously when the above conditions are met for 2 s.
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P0140
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DTCs P0116, P0117, P0118, P0119, P0125 are not set.
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The HO2S 2 heater is stable, and the estimated exhaust temperature was more than 250°C (482°F) for more than 90 s.
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The ignition voltage is more than 10.5 V.
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The estimated exhaust temperature is less than 800°C (1,472°F).
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DTC P0140 runs continuously when the above conditions are met for 60 s.
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P2232
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DTCs P0116, P0117, P0118, P0119, P0125 are not set.
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The HO2S 2 heater is stable, and the estimated exhaust temperature was more than 250°C (482°F) for more than 90 s.
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The ignition voltage is more than 10.5 V.
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The estimated exhaust temperature is less than 800°C (1,472°F).
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DTC P2232 runs continuously when the above conditions are met for 60 s.
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P2270
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DTCs P0036, P0037, P0038, P0137, P0138, P0140, P0141, P0443, P0458, P0459, P2232 are not set.
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The ignition voltage is more than 10.5 V.
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The HO2S 2 has been in Closed Loop for more than 10 s.
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The deceleration fuel cut-off is inactive.
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The engine air flow has been between 5.56-33.33 g/s for more than 3 s, and is currently more than 9.72 g/s.
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DTC P2270 runs continuously when the above conditions are met for 10 minutes.
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P2271
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DTCs P0036, P0037, P0038, P0137, P0138, P0140, P0141, P0443, P0458, P0459, P2232 are not set.
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The ignition voltage is more than 10.5 V.
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The HO2S 2 has been in Closed Loop for more than 10 s.
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The deceleration fuel cut-off is inactive.
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The engine air flow has been between 5.56-33.33 g/s for more than 3 s, and is currently more than 9.72 g/s.
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DTC P2271 runs continuously when the above conditions are met for 10 minutes.
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Conditions for Setting the DTC
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P0137
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The ECM detects that the HO2S 2 voltage parameter is less than 60 mV.
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DTC P0137 sets within 0.1 s during the lean test when the above condition is met.
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P0138
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The ECM detects that the HO2S 2 voltage parameter is more than 1,150 mV.
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DTC P0138 sets within 0.1 s during the rich test when the above condition is met.
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P0140
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The ECM detects that the HO2S 2 voltage parameter is between 0.401-0.519 V, or that the HO2S 2 internal resistance is more than 40,000 Ω while the calculated exhaust temperature is more than 600°C (1,112°F).
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DTC P0140 sets within 4 s when the above condition is met for 60 s.
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P2232
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The ECM detects that the HO2S 2 voltage and the HO2S 2 heater voltage changes are synchronous.
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DTC P2232 sets within 4 s when the above condition is met continuously, or within 50 s when the above condition is met cumulatively.
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P2270
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The ECM detects that the HO2S 2 voltage oscillations are slower than a calibrated value.
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DTC P2270 sets within 4 s when the above condition is met continuously, or within 50 s when the above condition is met cumulatively.
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P2271
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The ECM detects that the HO2S 2 voltage oscillations are faster than a calibrated value.
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DTC P2271 sets within 4 s when the above condition is met continuously, or within 50 s when the above condition is met cumulatively.
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Action Taken When the DTC Sets
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DTCs P0137, P0138, P0140, P2232, P2270, and P2271 are Type B DTCs.
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Conditions for Clearing the MIL/DTC
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DTCs P0137, P0138, P0140, P2232, P2270, and P2271 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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You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
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1.
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Note
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All modules must be powered down or misdiagnosis may result.
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Ignition OFF, disconnect the scan tool and wait 60 s to ensure all modules are powered down.
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2.
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Ignition OFF, disconnect the harness connector at the B52B HO2S 2.
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3.
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Ignition OFF, measure for less than 5 Ω between the signal circuit terminal A and ground.
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4.
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If more than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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5.
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Ignition ON, verify the scan tool HO2S 2 parameter is 400-500 mV.
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6.
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If more than the specified value, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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7.
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If less than the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
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8.
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Ignition ON, install a 3 A fused jumper wire at the signal circuit terminal B. Toggle the other end of the jumper wire between the signal circuit terminal A and battery voltage. Verify the scan tool HO2S 2 parameter toggles between 0 mV and approximately 1,000 mV.
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9.
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If the parameter does not toggle correctly, test the signal circuit terminal B for an open/high resistance. If the circuits test normal, replace the K20 ECM.
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10.
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If 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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Note
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For DTC P0131 and P0132, in order to ensure that the performance of the catalyst has not been affected by the fault that set this DTC, operate the vehicle within the Conditions for Running and setting DTC P0420, and verify that DTC P0420 runs and passes. Refer to
DTC P0420
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
