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P2231



DTC P0130, P0131, P0132, P0133, P2195, P2196, P2231, or P2297

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0130
- HO2S Circuit Closed Loop (CL) Performance Sensor 1

DTC P0131
- HO2S Circuit Low Voltage Sensor 1

DTC P0132
- HO2S Circuit High Voltage Sensor 1

DTC P0133
- HO2S Slow Response Sensor 1

DTC P2195
- HO2S Signal Biased Lean Sensor 1

DTC P2196
- HO2S Signal Biased Rich Sensor 1

DTC P2231
- HO2S Signal Circuit Shorted to Heater Circuit Sensor 1

DTC P2297
- HO2S Performance During Decel Fuel Cut-Off (DFCO) Sensor 1

Diagnostic Fault Information






Circuit/System Description

The wide band heated oxygen sensor (HO2S) measures the amount of oxygen in the exhaust stream more quickly and accurately than the switching style HO2S. The wide band sensor consists of an oxygen sensing 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 14.7:1. 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

P0130
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Engine Run Time parameter is more than 100 seconds.
* The Engine speed parameter is between 1,000-3,400 RPM.
* The Ignition 1 Signal parameter is between 10-18 volts.
* The Mass Airflow (MAF) Sensor parameter is between 10-30 g/s.
* The ECT Sensor parameter is more than 70°C (158°F).
* DTC P2A00 runs continuously when the above conditions are met for 5 seconds.

P0131 Lean Test Enable
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Loop Status parameter is Closed.
* The Ignition 1 Signal parameter is between 10-18 volts.
* The Fuel Level Sensor parameter is more than 10 percent.
* The Throttle Position (TP) Indicated Angle parameter is between 15-50 percent.
* DTC P0131 runs the lean test continuously when the above conditions are met for 2 seconds.

P0131 Power Enrichment Test Enable
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Ignition 1 Signal parameter is between 10-18 volts.
* The Fuel Level Sensor parameter is more than 10 percent.
* The Engine Run Time parameter is more than 30 seconds.
* DTC P0131 runs the power enrichment test continuously when the above conditions are met for 2 seconds.

P0132 Rich Test Enable
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Loop Status parameter is Closed.
* The Ignition 1 Signal parameter is between 10-18 volts.
* The Fuel Level Sensor parameter is more than 10 percent.
* The Throttle Position (TP) Sensor parameter is between 0-50 percent.
* DTC P0132 runs the rich test continuously when the above conditions are met for 2 seconds.

P0132 Decel Fuel Cut-Off Test Enable
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Loop Status parameter is Closed.
* The Ignition 1 Signal parameter is between 10-18 volts.
* The Fuel Level Sensor parameter is more than 10 percent.
* The Engine Run Time parameter is more than 30 seconds.
* DTC P0132 runs the decel fuel cut-off test continuously when the above conditions are met for 2 seconds.

P0133
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Engine Coolant Temperature (ECT) Sensor parameter is more than 70°C (158°F).
* The Ignition 1 Signal parameter is between 10-18 volts.
* The Fuel Level Sensor parameter is more than 10 percent.
* The Engine Run Time parameter is more than 200 seconds.
* The Engine Speed parameter is between 1,000-3,500 RPM.
* The Manifold Absolute Pressure (MAP) Sensor parameter is more than 30 kPa.
* The Mass Airflow (MAF) Sensor parameter is between 11-50 g/s.
* The Loop Status parameter is Closed.
* The Throttle Position (TP) Indicated Angle parameter is more than 5 percent.
* DTC P0133 runs once per drive cycle when the above conditions are met for 2 seconds.

P2195
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Loop Status parameter is Closed.
* The calculated accumulated exhaust gas mass is more than 800 grams.
* DTC P2195 runs continuously when the above conditions are met for 2 minutes.

P2196
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The Loop Status parameter is Closed.
* The calculated accumulated exhaust gas mass is more than 800 grams.
* DTC P2196 runs continuously when the above conditions are met for 2 minutes.

P2231
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The HO2S 1 heater duty cycle is more than 4 percent.
* The HO2S 1 heater has been fully heated for more than 10 seconds.
* All fuel injectors are activated.
* Battery voltage is between 10.5-18.1 volts.
* No critical misfires are detected.
* The catalyst heating mode is not active.
* The exhaust gas temperature is less than 800°C (1,472°F).
* DTC P2231 runs continuously when the above conditions are met for 10 seconds, or 10 minutes if fuel level is low.

P2297
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P2101, P2119, P2176 are not set.
* The engine is at operating temperature.
* The HO2S 1 heater is at operating temperature.
* Lambda is less than 1.6.
* All fuel injectors are active.
* DTC P2297 runs continuously when the above conditions are met for 10 seconds, or 10 minutes if fuel level is low.

Conditions for Setting the DTC

P0130
* The ECM detects that the Loop Status parameter is open.
* DTC P2A00 sets within 50 seconds when the above condition is met.

P0131 Lean Test
* The ECM detects that the HO2S 1 Voltage parameter is less than 50 mV.
* DTC P0131 sets within 100 seconds during the lean test when the above condition is met.

P0131 Power Enrichment Test
* The ECM detects that the HO2S 1 Voltage parameter is less than 800 mV.
* DTC P0131 sets within 100 seconds during the power enrichment test when the above condition is met.

P0132 Rich Test
* The ECM detects that the HO2S 1 parameter is more than 1,000 mV.
* DTC P0132 sets within 15 seconds during the rich test when the above condition is met.

P0132 Decel Fuel Cut-Off Test
* The ECM detects that the HO2S 1 parameter is more than 900 mV.
* DTC P0132 sets within 10 seconds during the decel fuel cut-off test when the above condition is met.

P0133
* The ECM detects that the HO2S 1 rich-to-lean or lean-to-rich average response time is more than 0.1 second.
* DTC P0133 sets within 60 seconds when the above condition is met.

P2195
* The ECM detects that the HO2S 1 signal is biased rich.
* DTC P2195 sets within 4 seconds when the above condition is met continuously, or within 50 seconds when met cumulatively.

P2196
* The ECM detects that the HO2S 1 signal is biased lean.
* DTC P2196 sets within 4 seconds when the above condition is met continuously, or within 50 seconds when met cumulatively.

P2231
* The ECM detects that the HO2S 1 signal voltage and heater control changes are synchronous.
* DTC P2231 sets within 4 seconds when the above condition is met continuously, or 50 seconds when the above condition is met cumulatively.

P2297
* The ECM detects that the HO2S 1 signal voltage is more than a calibrated value but is not out of range.
* DTC P2231 sets within 4 seconds when the above condition is met continuously, or 50 seconds when the above condition is met cumulatively.

Action Taken When the DTC Sets

DTC P0130, P0131, P0132, P0133, P2231, and P2297 are Type B DTCs.

Conditions for Clearing the DTC

DTC P0130, P0131, P0132, P0133, P2231, and P2297 are Type B DTCs.

Circuit/System Verification

1. Clear the DTCs with a scan tool.
2. Operate the vehicle within the conditions for running and setting the DTC. The DTC should not set.

Circuit/System Testing

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, disconnect the HO2S 1.
2. Ignition ON, test for 2.9 volts between the HO2S 1 High Signal circuit terminal 6 and ground.

• If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
• If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.

3. Ignition ON, test for 2.5 volts between the HO2S 1 low signal circuit terminal 2 and ground.

• If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
• If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.

4. Ignition ON, test for 2.8 volts between the HO2S 1 Output Pump Current circuit terminal 1 and ground.

• If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
• If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.

5. Ignition ON, test for 2.8 volts between the HO2S 1 Input Pump Current circuit terminal 5 and ground.

• If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
• If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.

6. Ignition OFF, disconnect the ECM connector C1.
7. Ignition OFF, test for infinite ohms between each HO2S 1 circuit terminal and all other HO2S 1 circuit terminals.

• If less than the specified value, repair as necessary.

8. If the ECM and all circuits test normal, replace the HO2S 1.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Heated Oxygen Sensor Resistance Learn Reset Notice
* Heated Oxygen Sensor 1 Replacement
* Refer to Programming and Relearning for ECM setup and programming. Programming and Relearning
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