P2433

DTC P2430-P2433

Diagnostic Instructions

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

DTC Descriptors
DTC P2430
- Secondary Air Injection System Pressure Sensor Circuit

DTC P2431
- Secondary Air Injection System Pressure Sensor Performance

DTC P2432
- Secondary Air Injection System Pressure Sensor Circuit Low Voltage

DTC P2433
- Secondary Air Injection System Pressure Sensor Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. A secondary air injection pressure sensor is used to monitor the air flow from the secondary air injection pump. The Engine Control Module (ECM) supplies voltage to the 5 V reference circuit and provides a ground for the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.

Conditions for Running the DTC

DTC P2430
* DTCs P0412, P0418, P0606, P0641 or P0651 are not set.
* Greater than 60 min has elapsed since the last cold start.
* The barometric pressure (BARO) is greater than 60 kPa (8.7 psi).
* The intake air temperature (IAT) is greater than -11°C (12°F).
* The engine coolant temperature (ECT) is between -11 to +60°C (12-140°F).
* The ignition voltage is between 10-32 V.
* The manifold absolute pressure (MAP) sensor is greater than 20 kPa (2.9 psi).
* The engine speed is less than 5,000 RPM.
* The mass air flow (MAF) is less than 50 g/s.
* The AIR pump is commanded ON.
* DTC P2430 runs continuously when the above conditions are met.

DTC P2431
* DTCs P0101, P0102, P0103, P0300, P0301, P0302, P0304, P0412, P0418, P0606, P0641 or P0651 are not set.
* The barometric pressure (BARO) is greater than 60 kPa (8.7 psi).
* The intake air temperature (IAT) is warmer than -11°C (12°F).
* The engine coolant temperature (ECT) is between -11 to +60°C (12-140°F).
* The ignition voltage is between 10-32 V.
* The manifold absolute pressure (MAP) sensor is greater than 20 kPa (2.9 psi).
* Run/Crank is not active.
* The engine speed is less than 5,000 RPM.
* The mass air flow (MAF) is less than 50 g/s.
* Greater than 60 minutes has elapsed since the last cold start.
* DTC P2431 runs continuously when the above conditions are met.

P2432 and P2433
* DTCs P0606, P0641, or P0651 are not set.
* The ignition is ON or the engine is running.
* DTC P2432 and P2433 run continuously when the above conditions are met.

Conditions for Setting the DTC

P2430

The ECM determines that the pressure sensor value change is less than a calibrated value.

P2431
* The ECM determines that the difference between the Secondary Air Injection pressure sensor and the BARO sensor signal is greater than 14 kPa (2.0 psi) or less than -10 kPa (-1.5 psi) when the Secondary Air Injection Pump is commanded OFF.
OR
* The ECM determines that the difference between the Secondary Air Injection pressure sensor and the BARO sensor signal is greater than 50 kPa (21.8 psi) when the Secondary Air Injection Pump is commanded ON.

DTC P2432

The Secondary Air Pressure sensor signal is less than 0.3 V for greater than 5 s.

DTC P2433

The Secondary Air Pressure sensor signal is greater than 4.7 V for greater than 5 s.

Action Taken When the DTC Sets

DTCs P2430, P2431, P2432 and P2433 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P2430, P2431, P2432 and P2433 are Type B DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Secondary Air Injection System Description (Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the diagnostic trouble code (DTC) information with a scan tool. Verify that DTC P0651 is not set.

• If DTC P0651 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.

2. Compare the scan tool BARO pressure parameter to the Altitude Versus Barometric Pressure (Altitude Versus Barometric Pressure) table. The BARO should be within the specified range displayed in the table for the specific altitude.

• If not within the specified range, refer to DTC P0106 (P0106) for further diagnosis.

3. Compare the scan tool Secondary Air Injection Pressure Sensor pressure parameter to the BARO reading. The readings should be within 3 kPa (0.4 psi).
4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: The Secondary Air Pressure sensor is an integral part of the Secondary Air Injection Solenoid Valve.

1. Ignition OFF, disconnect the harness connector at the Q29 Secondary Air Injection Solenoid Valve.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the low reference circuit terminal 3 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is less than 0.5 V.

• If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 1. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is greater than 4.8 V.

• If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

6. If all circuits test normal, test or replace the Q29 Secondary Air Injection Solenoid Valve.

Repair Instructions

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

* Secondary Air Injection Check Valve Replacement (Secondary Air Injection Check Valve Replacement)
* Control Module References (Programming and Relearning) for Engine Control Module replacement, setup, and programming