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 provide an overview of each diagnostic category.

### DTC Descriptor

DTC P0130 00: HO2S Circuit Sensor 1
DTC P0131 00: HO2S Circuit Low Voltage Sensor 1
DTC P0132 00: HO2S Circuit High Voltage Sensor 1
DTC P0133 00: HO2S Slow Response Sensor 1
DTC P0134 00: HO2S Circuit Insufficient Activity Sensor 1
DTC P2A00 00: 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 00 P0130 00 | P0030 00, P0130 00, P0135 00 | -- | --
HO2S 1 Heater Low Control | P0031 00 P0130 00 | P0031 00, P0135 00 | P0032 00 | --
HO2S 1 Signal | P0131 00 | P0134 00 | P0132 00 | P0133 00, P0134 00, P2297 00, P2A00 00
HO2S 1 Voltage Reference | P0131 00 | P0134 00 | -- | --

### Circuit/System Description

Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. The heated oxygen sensor (HO2S) 1 compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The heated oxygen sensor (HO2S) 1 must reach operating temperature to provide an accurate voltage signal. Heating elements inside the heated oxygen sensor (HO2S) 1 minimize the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the heated oxygen sensor (HO2S) 1 with a reference, or bias, voltage of about 450 mV. When the engine is first started, the ECM operates in open loop, ignoring the heated oxygen sensor (HO2S) 1 voltage signal. Once the heated oxygen sensor (HO2S) 1 reaches operating temperature and closed loop is achieved, the heated oxygen sensor (HO2S) 1 generates a voltage within a range of 0-1000 mV that fluctuates above and below bias voltage. High heated oxygen sensor (HO2S) 1 voltage indicates a rich exhaust stream. Low heated oxygen sensor (HO2S) 1 voltage indicates a lean exhaust stream.

### Conditions for Running the DTC

#### P0130 00

• | DTCs P0030 00, P0031 00, P0032 00, P0130 00, P0131 00, P0132 00, P0133 00, P0134 00, P0135 00, P2297 00, P2A00 00 are not set.

• | The ignition is ON.

• | DTC P0130 00 runs continuously when the above conditions are met for 10 s.

#### P0131 00

• | DTCs P0030 00, P0031 00, P0032 00, P0036 00, P0037 00, P0038 00, P0132 00, P0133 00, P0134 00, P0135 00, P0137 00, P0138 00, P0139 00, P0140 00, P0141 00, P0443 00, P0458 00, P0459 00, P0496 00, P2270 00, P2271 00, P2297 00, P2A00 00, P2A01 00 are not set.

• | The ignition is ON.

• | The fuel system is in closed loop.

• | DTC P0131 00 runs continuously when the above conditions are met for 2 s.

#### P0132 00

• | DTCs P0030 00, P0031 00, P0032 00, P0130 00, P0131 00, P0133 00, P0134 00, P0135 00, P2297 00, P2A00 00 are not set.

• | The ignition is ON.

• | DTC P0132 00 runs the rich test continuously when the above conditions are met for 2 s.

#### P0133 00

• | DTCs P000A 00, P000B 00, P0010 00, P0011 00, P0013 00, P0014 00, P0016 00, P0017 00, P0030 00, P0031 00, P0032 00, P0117 00, P0118 00, P0119 00, P0122 00, P0123 00, P0130 00, P0131 00, P0132 00, P0134 00, P0135 00, P0171 00, P0172 00, P0221 00, P0222 00, P0223 00, P0300 00, P0301 00, P0302 00, P0303 00, P0304 00, P0313 00, P0335 00, P0336 00, P0340 00, P0341 00, P0365 00, P0366 00, P0443 00, P0458 00, P0459 00, P0496 00, P2088 00, P2089 00, P2090 00, P2091 00, P2100 00, P2101 00, P2176 00, P2297 00, P2A00 00 are not set.

• | The ignition is ON.

• | The engine speed parameter is between 1500-3500 RPM.

• | The manifold absolute pressure (MAP) is greater than 75 kPa (11 PSI).

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

• | DTC P0133 00 runs continuously.

#### P0134 00

• | DTCs P0030 00, P0031 00, P0032 00, P0130 00, P0131 00, P0132 00, P0133 00, P0134 00, P0135 00, P2297 00, P2A00 00 are not set.

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

• | DTC P0134 00 runs continuously when the above conditions are met for 5 s.

#### P2A00

• | DTCs P0030 00, P0031 00, P0032 00, P0130 00, P0131 00, P0132 00, P0133 00, P0134 00, P2297 00 are not set.

• | The ignition is ON.

### Conditions for Setting the DTC

#### P0130 00

• | The ECM detects that the resistance of the HO2S circuit is greater than 60 kΩ.

• | DTC P0130 00 sets within 10 s after the above condition is met.

#### P0131 00

• | The ECM detects that the heated oxygen sensor (HO2S) 1 voltage parameter is less than 24 mV.

• | DTC P0131 00 sets within 2 s during the lean test when the above condition is met.

#### P0132 00

• | The ECM detects that the heated oxygen sensor (HO2S) 1 voltage is more than 1200 mV.

• | DTC P0132 00 sets within 2 s when the above condition is met.

#### P0133 00

• | The ECM detects that the heated oxygen sensor (HO2S) 1 rich-to-lean or lean-to-rich average response time is more than 0.1 s.

• | DTC P0133 00 sets within 3 s when the above condition is met.

#### P0134 00

• | The ECM detects that the activity of the heated oxygen sensor (HO2S) 1 is less than a calibrated value.

• | DTC P0134 00 sets within 100 mS after the above condition is met.

#### P2A00 00

• | The ECM detects that the heated oxygen sensor (HO2S) 1 is not ready after 30 s.

• | DTC P2A00 00 sets immediately after the above condition is met.

### Action Taken When the DTC Sets

DTCs P0130 00, P0131 00, P0132 00, P0133 00, P0134 00, P2297 00, and P2A00 00 are Type B DTCs.

### Conditions for Clearing the DTC

DTCs P0130 00, P0131 00, P0132 00, P0133 00, P0134 00, P2297 00, and P2A00 00 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

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

1. Ignition OFF, disconnect the harness connector at the B52A Heated Oxygen Sensor (HO2S).
2. Ignition OFF, measure for less than 5 Ω between the B52A Heated Oxygen Sensor (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 K20 Engine Control Module (ECM)

3. Ignition ON, verify the appropriate scan tool HO2S 1 parameter is approximately 450 mV.

⇒ | If more than the specified value, test the appropriate B52A Heated Oxygen Sensor (HO2S) high signal circuit terminal 2 or a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

⇒ | If less than the specified value, test the appropriate B52A Heated Oxygen Sensor (HO2S) high signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

4. Ignition ON, install a 3A fused jumper wire at the B52A Heated Oxygen Sensor (HO2S) high signal circuit terminal 2. Toggle the jumper wire between the B52A Heated Oxygen Sensor (HO2S) low signal circuit terminal 4 and battery voltage. Verify the appropriate scan tool HO2S 1 parameter toggles between 0 mV and approximately 1000 mV.

⇒ | If the appropriate scan tool B52A Heated Oxygen Sensor (HO2S) parameter does not toggle correctly, test the B52A Heated Oxygen Sensor (HO2S) High Signal Circuit for an open/high resistance. If the circuits test normal, replace the K20 Engine Control Module (ECM).

5. If all circuits test normal, replace the appropriate B52A Heated Oxygen Sensor (HO2S).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Heated Oxygen Sensor Replacement - Sensor 1

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