DTC P0137-P0140, P2270, or P2271 (LLU)
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DTC P0137-P0140, P2270, or P2271 (LLU)
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DTC P0137 00
HO2S Circuit Low Voltage Sensor 2
DTC P0138 00
HO2S Circuit High Voltage Sensor 2
DTC P0140 00
HO2S Circuit Insufficient Activity Sensor 2
DTC P2270 00
HO2S Signal Stuck Lean Sensor 2
DTC P2271 00
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/High Resistance
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Short to Voltage
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Signal Performance
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Heater Voltage Supply
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Opens Fuse
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P0036 00, P0037 00, P0141 00
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-
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P0141 00
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Heater Low Control
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P0036 00, P0037 00,
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P0036 00, P0037 00, P0141 00
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P0036 00, P0138 00, P0141 00
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P0141 00
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Signal Circuit High
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P0137 00
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-
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P0138 00
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Ground
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-
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Circuit/System Description
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The heated oxygen sensors (HO2S) 1 or 2 are used for fuel control and catalyst monitoring. Each heated oxygen sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an open loop mode, ignoring the heated oxygen sensor signal voltage while calculating the air to fuel ratio. The control module supplies the heated oxygen sensor with a reference, or bias voltage of about 450 mV. While the engine runs, each heated oxygen sensor heats up and begins to generate a voltage within a range of 0-1000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient heated oxygen sensors 1 or 2 voltage fluctuation is observed by the control module, closed loop is entered. The control module uses the heated oxygen sensor voltage to determine the air to fuel ratio. An heated oxygen sensor voltage that increases above bias voltage toward 1000 mV indicates a rich fuel mixture. An heated oxygen sensor voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.
The heating elements inside each heated oxygen sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter closed loop earlier and the control module to calculate the air to fuel ratio sooner.
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Conditions for Running the DTC
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P0137 00
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DTCs P0116 00, P0117 00, or P0118 00 are not set.
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The ignition voltage is between 11-18 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 modeled exhaust gas temp model 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 00 runs once per drive cycle when the above conditions are met for 2 s.
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P0138 00
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DTCs P0116 00, P0117 00, or P0118 00 are not set.
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The loop status parameter is closed.
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The ignition signal parameter is between 11-18 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 modeled exhaust gas temp model is less than 800°C (1 472°F).
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DTC P0138 00 runs the rich test continuously when the above conditions are met for 2 s.
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P0140 00
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DTCs P0116 00, P0117 00, or P0118 00 are not set.
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The heated oxygen sensor 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 signal parameter is between 11-18 V.
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The modeled exhaust gas temp model is less than 800°C (1 472°F).
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DTC P0140 00 runs continuously when the above conditions are met for 60 s.
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P2270 00
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DTCs P0036 00, P0037 00, P0038 00, P0137 00, P0138 00, P0140 00, P0141 00, P0458 00, or P0459 00 are not set.
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The ignition signal parameter is between 11-18 V.
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The heated oxygen sensor 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 00 runs continuously when the above conditions are met for 10 min.
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P2271 00
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DTCs P0036 00, P0037 00, P0038 00, P0137 00, P0138 00, P0140 00, P0141 00, P0458 00, P0459 00 are not set.
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The ignition signal parameter is between 11-18 V.
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The heated oxygen sensor 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 00 runs continuously when the above conditions are met for 10 min.
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Conditions for Setting the DTC
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P0137 00
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The ECM detects that the heated oxygen sensor 2 voltage parameter is less than 60 mV.
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DTC P013 007 sets within 0.5 s during the lean test when the above condition is met for 30 s.
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P0138 00
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The ECM detects that the heated oxygen sensor 2 voltage parameter is greater than 1 150 mV.
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DTC P0138 00 sets within 0.1 s during the rich test when the above condition is met for 5.5 s.
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P0140 00
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The ECM detects that the heated oxygen sensor 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 00 sets within 4 s when the above condition is met for 60 s.
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P2270 00
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The ECM detects that the heated oxygen sensor 2 voltage oscillations are slower than a calibrated value.
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DTC P2270 00 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 00
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The ECM detects that the heated oxygen sensor 2 voltage oscillations are faster than a calibrated value.
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DTC P2271 00 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 00, P0138 00, P0140 00, P2270 00, and P2271 00 are Type B DTCs.
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Conditions for Clearing the DTC
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DTCs P0137 00, P0138 00, P0140 00, P2270 00, and P2271 00 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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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 are captured in the freeze frame/failure records data.
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Note
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All modules must be powered down or misdiagnosis may result.
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1.
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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 Heated Oxygen Sensor 2.
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3.
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Ignition OFF, measure for less than 5 Ω between the B52B Heated Oxygen Sensor 2 low signal circuit terminal 3 and ground.
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4.
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If greater than the specified range, test the low signal circuit for the B52B heated oxygen sensor 2 for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
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5.
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Ignition ON, verify the scan tool HO2S Sensor 2 parameter is approximately 450 mV.
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6.
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If greater than the specified value, test the high signal circuit for the B52B heated oxygen sensor 2 for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
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7.
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If lower than the specified value, test the high signal circuit for the B52B heated oxygen sensor 2 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
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8.
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Ignition ON, install a 3 A fused jumper wire at the B52B Heated Oxygen Sensor 2 high signal circuit terminal 4. Toggle the other end of the jumper wire between the B52B Heated Oxygen Sensor 2 low signal circuit terminal 3 and battery voltage. Verify the scan tool HO2S Sensor 2 parameter toggles between 0 mV and approximately 1 000 mV.
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9.
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If the scan tool HO2S Sensor 2 parameter does not toggle correctly, test the B52B Heated Oxygen Sensor 2 high signal circuit for an open/high resistance. If the circuits test normal, replace the K20 Engine Control Module.
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10.
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If the circuits test normal, test or replace the B52B Heated Oxygen Sensor 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 00 and P0132 00, 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 00, and verify that DTC P0420 00 runs and passes.
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Refer to
DTC P0420 (LLU)
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
