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 P2297 00: HO2S Performance During Decel Fuel Cut-Off 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. Each heated oxygen sensor (HO2S) compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The heated oxygen sensor (HO2S) must reach operating temperature to provide an accurate voltage signal. Heating elements inside the heated oxygen sensor (HO2S) minimize the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the heated oxygen sensor (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 heated oxygen sensor (HO2S) voltage signal. Once the heated oxygen sensor (HO2S) reaches operating temperature and closed loop is achieved, the heated oxygen sensor (HO2S) generates a voltage within a range of 0-1000 mV that fluctuates above and below bias voltage. High heated oxygen sensor (HO2S) voltage indicates a rich exhaust stream. Low heated oxygen sensor (HO2S) voltage indicates a lean exhaust stream.

### Conditions for Running the DTC

#### P2297 00

• | DTCs P0030 00, P0031 00, P0032 00, P0130 00, P0131 00, P0132 00, P0133 00, P0134 00, P0135 00, P0171 00, P0172 00, P0201 00, P0202 00, P0203 00, P0204 00, P0261 00, P0262 00, P0264 00, P0265 00, P0267 00, P0268 00, P0270 00, P0300 00, P0301 00, P0302 00, P0303 00, P0304 00, P0313 00, P0443 00, P0458 00, P0459 00, P0496 00, P2A01 00 are not set.

• | The engine is running.

• | DTC P2297 00 runs continuously when the above conditions are met for 10 s, or 10 min if fuel level is low.

### Conditions for Setting the DTC

#### P2297 00

• | The ECM detects that the heated oxygen sensor (HO2S) 1 signal voltage is more than a calibrated value but is not out of range.

• | DTC P2297 00 sets within 4 s when the above condition is met continuously, or 50 s when the above condition is met cumulatively.

### Action Taken When the DTC Sets

DTCs P2297 00 is a Type B DTCs.

### Conditions for Clearing the DTC

DTCs P2297 00 is a 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 B52A Heated Oxygen Sensor (HO2S) low signal circuit terminal 4 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 2 parameter is approximately 450 mV.

⇒ | If more than the specified value, test the appropriate B52A Heated Oxygen Sensor (HO2S) high signal circuit terminal 2 for 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 V2 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 B52A Heated Oxygen Sensor (HO2S) parameter toggles between 0 mV and approximately 1000 mV.

⇒ | If the appropriate scan tool B52A Heated Oxygen Sensor (HO2S) 2 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