For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | 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 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 P0134 : HO2S Circuit Insufficient Activity Sensor 1
DTC P2297 : HO2S Performance During Decel Fuel Cut-Off (DFCO) Sensor 1
DTC P2A00: HO2S Performance Sensor 1

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
HO2S 1 Heater Voltage Supply | P0031, P0130 | P0030, P0130, P0135 | -- | --
HO2S 1 Heater Low Control | P0031, P0130 | P0031, P0135 | P0032 | --
HO2S 1 Signal | P0131 | P0134 | P0132 | P0133, P0134, P2297, P2A00
HO2S 1 Voltage Reference | Opens Fuse | P0134 | -- | --

### Circuit/System Description

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.

### Conditions for Running the DTC

#### P0130

• | DTCs P0030, P0031, P0032, P0130, P0131, P0132, P0133, P0134, P0135, P2297, P2A00 are not set.

• | The ignition is ON.

• | This DTC runs continuously after the above conditions have been met for 10 seconds.

#### P0131

• | DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0102, P0103, P0130, P0132, P0133, P0134, P0135, P0137, P0138, P0139, P0140, P0141, P0443, P0458, P0459, P0496, P2270, P2271, P2297, P2A00, P2A01 are not set.

• | The ignition is ON.

• | The mass air flow is more than 8 kg/h.

• | DTC P0131 runs continuously when the above conditions are met for 2 seconds.

#### P0132

• | DTCs P0030, P0031, P0032, P0130, P0131, P0133, P0134, P0135, P2297, P2A00 are not set.

• | The Ignition is ON.

• | DTC P0132 runs the rich test continuously when the above conditions are met for 2 seconds.

#### P0133

• | DTCs P000A, P000B, P0010, P0011, P0013, P0014, P0016, P0017, P0030, P0031, P0032, P0068, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0130, P0131, P0132, P0134, P0135, P0171, P0172, P0221, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0313, P0335, P0336, P0340, P0341, P0365, P0366, P0443, P0458, P0459, P0496, P1101, P2088, P2089, P2090, P2091, P2100, P2101, P2176, P2297, P2A00 are not set.

• | The ignition is ON.

• | The Engine Speed parameter is between 1,500-3,500 RPM.

• | The mass air flow is between 27.5-120 kg/h.

• | The engine coolant temperature is hotter than 50.25°C (122.45°F).

• | DTC P0133 runs continuously.

#### P0134

• | DTCs P0030, P0031, P0032, P0130, P0131, P0132, P0133, P0134, P0135, P2297, P2A00 are not set.

• | The engine has been running for more than 5 minutes.

• | DTC P0134 runs continuously when the above conditions are met for 5 seconds.

#### P2297

• | DTCs P0030, P0031, P0032, P0068, P0101, P0102, P0103, P0130, P0131, P0132, P0133, P0134, P0135, P0171, P0172, P0201, P0202, P0203, P0204, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0300, P0301, P0302, P0303, P0304, P0313, P0443, P0458, P0459, P0496, P1101, P2A01 are not set.

• | The engine is running.

• | DTC P2297 runs continuously when the above conditions are met for 10 seconds, or 10 minutes if fuel level is low.

#### P2A00

• | DTCs P0030, P0031, P0032, P0130, P0131, P0132, P0133, P0134, P2297 are not set.

• | The ignition is ON.

### Conditions for Setting the DTC

#### P0130

• | The ECM detects that the resistance of the HO2S circuit is more than 60,000 ohms.

• | DTC P0130 sets within 5 seconds after the above condition is met.

#### P0131

• | The ECM detects that the HO2S 1 Voltage parameter is less than 24 mV.

• | DTC P0131 sets within 2 seconds when the above condition is met.

#### P0132

• | The ECM detects that the HO2S 1 parameter is more than 1,200 mV.

• | DTC P0132 sets within 2 seconds 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 3 seconds when the above condition is met.

#### P0134

• | The ECM detects that the activity of the HO2S 1 is less than a calibrated value.

• | DTC P0134 sets within 100 mS after the above condition is met.

#### 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.

#### P2A00

• | The ECM detects that the HO2S 1 is not ready after 30 seconds.

• | DTC P2A00 sets immediately after the above condition is met.

### Action Taken When the DTC Sets

DTCs P0130, P0131, P0132, P0133, P0134, P2297 and P2A00 are Type B DTCs.

### Conditions for Clearing the DTC

DTCs P0130, P0131, P0132, P0133, P0134, P2297 and P2A00 are Type B DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

• | Heated Oxygen Sensor Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### 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 harness connector at the HO2S.
2. Ignition OFF, measure for less than 5 ohms between the HO2S low signal circuit terminal 4 and ground.

⇒ | If more than the specified range, test the appropriate HO2S low signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, verify the appropriate scan tool HO2S parameter is approximately 450 mV.

⇒ | If more than the specified value, test the appropriate HO2S high signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.

⇒ | If less than the specified value, test the appropriate HO2S high signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

4. Ignition ON, install a 3A fused jumper wire at the HO2S high signal circuit terminal 2. Toggle the other end of the jumper wire between the HO2S low signal circuit terminal 4 and battery voltage. Verify the appropriate scan tool HO2S parameter toggles between 0 mV and approximately 5,000 mV.

⇒ | 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 ECM.

5. If all circuits test normal, replace the appropriate HO2S.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Heated Oxygen Sensor 1 Replacement

• | Control Module References for ECM replacement, setup, and programming