PRE-RELEASE
DTC P0131 or P0132
| DTC P0131 or P0132 |
| Diagnostic Instructions |
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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 Descriptors |
DTC P0131 01
HO2S Circuit Low Voltage Sensor 1
DTC P0131 12
HO2S Circuit Low Voltage Sensor 1
DTC P0131 52
HO2S Circuit Low Voltage Sensor 1
DTC P0131 5A
HO2S Circuit Low Voltage Sensor 1
DTC P0132 02
HO2S Circuit High Voltage Sensor 1
DTC P0132 11
HO2S Circuit High Voltage Sensor 1
DTC P0132 52
HO2S Circuit High Voltage Sensor 1
DTC P0132 5B
HO2S Circuit High Voltage Sensor 1
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Heater Voltage Supply
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P0030 00
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P0030 00
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-
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P0131 5A, P0131 12
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Reference Voltage (Signal)
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P0131 01
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P0131 12, P2243 00, P2231 00
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P0131 02, P2231 00
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P0133 00, P0131 52, P0131 5A, P0132 52, P0132 5B
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Signal (Pump Current)
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P2626 00
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P2626 00
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P2626 00, P2231 00
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-
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Signal (Trim Current)
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P2626 00
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P2626 00
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P2626 00
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-
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Heater Low Control
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P0031 00
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P0030 00
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P0032 00
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-
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Low Reference (Ground)
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P2A00 00
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P0132 02, P2243 04
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P0132 02
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-
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| Typical Scan Tool Data |
HO2S Bank 1 Sensor 1
| HO2S Sensor Voltage Circuits | Normal Range | Short to Ground | Open | Short to Voltage |
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HO2S High Signal
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0-1 000 mV
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0-90 mV
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350-550 mV
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Approximately 1 100 mV
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HO2S Low Signal
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0-1 000 mV
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0-1 000 mV
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0-1 000 mV
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0-1 100 mV
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| Circuit/System Description |
The heated broadband oxygen sensor (HO2S) measures the quantity of oxygen in the exhaust stream faster and more accurately than an HO2S of a switching type. The broadband probe consists of a oxygen detection cell, an oxygen pumping cell and a heater. The exhaust gas sample passes through a diffusion gap between the sensing cell and the pumping cell. The engine control module (ECM) supplies a signal voltage to the HO2S and uses this voltage as a reference to the amount of oxygen in the exhaust system. An electronic circuit within the ECM controls the pump current through the oxygen pumping cell in order to maintain a constant signal voltage. The ECM monitors the voltage variation on the signal circuit and attempts to keep the voltage constant by increasing or decreasing the amount of current flow or reversing the direction of the current flow to the pumping cell. By measuring the direction and amount of current required to maintain the signal voltage, the ECM can determine the concentration of oxygen in the exhaust. The signal voltage is displayed as a lambda value. A lambda value of 1 is equal to a stoichiometric air fuel ratio of 60:1. Under normal operating conditions, the lambda value will remain around 1. When the system is lean, the oxygen level will be high and the lambda value will be high, or more than 1. When the system is rich, the oxygen level is low and the lambda value will be low, or less than 1. The ECM uses this information to maintain the proper air/fuel ratio.
| Conditions for Running the DTC |
P0131 and P0132
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The system voltage is between 10-18 V.
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The scan tool special functions are not active
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The Throttle Position Indicated Angle parameter is between 3-90%.
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The loop status parameter is closed.
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The traction control is not active.
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The above conditions must be met for at least 5 seconds.
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| Conditions for Setting the DTC |
P0131
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The ECM detects that the HO2S 1 signal voltage is less than 50 mV for more than 2 seconds.
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This diagnostic runs continuously.
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P0132
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The ECM detects that the HO2S 1 signal voltage is more than 1 050 mV for more than 2 seconds.
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This diagnostic runs continuously.
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| Action Taken When the DTC Sets |
DTCs P0131 and P0132 are Type B DTCs.
| Conditions for Clearing the DTC |
DTCs P0131 and P0132 are Type B DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Heated Oxygen Sensor Wiring Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
| Circuit/System Verification |
| 1. |
Clear the DTCs with a scan tool.
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| 2. |
Operate the vehicle within the conditions to run and set the DTC. The DTC should not be set.
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| 3. |
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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| Circuit/System Testing |
| Note | ||
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All modules must be powered down or misdiagnosis may result. |
| 1. |
Ignition OFF, disconnect the scan tool and wait 60 seconds to ensure all modules are powered down.
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| 2. |
Disconnect the harness connector at the B52A Heated Oxygen Sensor 1.
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| 3. |
Test for less than 5 Ω between the low reference circuit terminal 2 X1 and ground.
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| 4. |
If more than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 5. |
Ignition ON, verify the scan tool HO2S Bank 1 Sensor 1 parameter is approximately 450 mV.
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| 6. |
If more than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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| 7. |
If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
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| 8. |
Ignition ON, install a 3 A fused jumper wire at the HO2S high signal circuit terminal B. Toggle the jumper wire between the HO2S low signal circuit terminal A and the battery voltage. Verify the appropriate scan tool HO2S parameter toggles between 0 mV and approximately 1 000 mV.
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| 9. |
If the appropriate scan tool HO2S parameter does not toggle correctly, test the HO2S high signal circuit for an open/high resistance. If the circuits test normal, replace the K20 Engine Control Module.
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| 10. |
If all circuits test normal, replace the appropriate HO2S Sensor.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Heated Oxygen Sensor Replacement - Sensor 1
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Control Module References
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