P2431

DTC P2430 or P2431

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 Descriptor

DTC P2430
- Secondary Air Injection System Pressure Sensor Circuit

DTC P2431
- Secondary Air Injection System Pressure Sensor Performance

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 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-volt reference circuit and supplies a ground to the low reference circuit. The sensor provides a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.

Ignition voltage is supplied to the secondary air injection pump and air injection check valve relay. The ECM controls the relay by grounding the control circuit, which activates the relay. When the relay contact closes, voltage is supplied to the pump and the valve, which turns the pump on and opens the valve.

The diagnostic uses 3 phases to test the secondary air injection system:

* DTCs P0411 and P2430 run during Phase 1

* DTCs P2430 and P2440 run during Phase 2

* DTC P2444 runs during Phase 3

During phase 1, both the secondary air injection pump and the secondary air injection check valve are activated. Normal secondary air function occurs. Expected system pressure is 6-14 kPa (0.9-2.0 psi) above BARO.

During phase 2, only the secondary air injection pump is activated. The check valve is closed. Pressure sensor performance and check valve deactivation are tested. Expected system pressure is 18-28 kPa (2.6-4.0 psi) above BARO.

During phase 3, neither the secondary air injection pump nor the secondary air injection check valve are activated. Secondary air injection pump deactivation is tested. Expected system pressure equals BARO.

Conditions for Running the DTC

P2430

* DTC P0412, P0418, P0606, P0641, P0651, P2430, P2431, P2432, or P2433 is not set.

* The engine has been OFF for greater than 10 s.

* The ignition voltage is greater than 10 V.

* The engine speed is less than 3,000 RPM.

* The intake air temperature (IAT) is greater than -12°C (+10°F).

* The engine coolant temperature (ECT) is between -12 and +38°C (10-100°F).

* The barometric pressure (BARO) is greater than 60 kPa (8.7 psi).

* The manifold absolute pressure (MAP) sensor is greater than 20 kPa (2.9 psi).

* The mass air flow (MAF) is less than 50 g/s.

* The secondary air injection pump is commanded ON.

* DTC P2430 runs once per ignition cycle when the above conditions are met for greater than 5 s.

P2431

* DTC P0101, P0102, P0103, P0300, P0301, P0302, P0304, P0411, P0412, P0418, P0606, P0641, P0651, P2430, P2432, or P2433 is not set.

* The engine has been OFF for greater than 10 s.

* The ignition voltage is greater than 10 V.

* The engine speed is less than 3,000 RPM.

* The intake air temperature (IAT) is greater than -12°C (+10°F).

* The engine coolant temperature (ECT) is between -12 and +38°C (10-100°F).

* The barometric pressure (BARO) is greater than 60 kPa (8.7 psi).

* The manifold absolute pressure (MAP) sensor is greater than 20 kPa (2.9 psi).

* The mass air flow (MAF) is less than 50 g/s.

* The secondary air injection pump is commanded ON.

* DTC P2431 runs continuously when the above conditions are met for greater than 15 s.

Conditions for Setting the DTC

P2430

The ECM determines that the pressure sensor value change is less than 0.5 kPa and the signal variation is less than 1 kPa for greater than 5 s when the secondary air injection pump is commanded ON.

P2431

* The difference between the actual system pressure and BARO is greater than 14 kPa (2.0 psi) or less than -10 kPa -1.5 psi) for greater than 15 s when the secondary air injection pump is commanded OFF.
OR

* The difference between the actual system pressure and BARO is greater than 50 kPa (7.3 psi) for greater than 15 s when the secondary air injection pump is commanded ON.

Action Taken When the DTC Sets

DTCs P2430 and P2431 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P2430 and P2431 are Type B DTCs.

Diagnostic Aids

Ice buildup due to condensation/water in the air passages or pump may cause these DTCs to set.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1

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

Special Tools

J-36169-HD - Fused Jumper

Circuit/System Verification

Note: Verify the battery is fully charged before proceeding with this diagnostic procedure. The secondary air injection pump output will vary with system voltage.

1. Vehicle in Service Mode

2. Verify that DTC P0411, P0412, P0418, P2432, P2433, P2440, or P2444 is not set.

• If any of the DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

• If none of the DTCs are set.

3. Verify the scan tool BARO pressure parameter is within the range specified in the Altitude Versus Barometric Pressure Altitude Versus Barometric Pressure table.

• If not within the specified range
Refer to DTC P0106 P0106 for further diagnosis.

• If within the specified range

Note: To prevent the secondary air injection pump from overheating, do not operate the pump consecutively for greater than 2 minutes. The pump is provided with a thermal protector that will automatically reset when allowed to cool. Engine coolant temperature must be greater than 5°C (41°F) to enable scan tool device control.

4. Verify the secondary air injection pump turns ON and OFF when commanding the Secondary Air Injection Pump Relay ON and OFF with a scan tool.

• If the secondary air injection pump does not turn ON and OFF
Refer to Circuit/System Testing-Secondary Air Injection Pump Malfunction

• If the secondary air injection pump turns ON and OFF

5. Verify the scan tool Secondary Air Injection Pressure Sensor parameter and the BARO pressure parameter are within 3 kPa (0.4 psi).

• If not within the specified range
Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range.

• If within the specified range

6. Engine running

7. Command the Secondary Air Injection Pump Relay ON with a scan tool. Verify the scan tool Secondary Air Injection Pressure Sensor parameter increases between 18-28 kPa (2.6-4.0 psi).

• If not within the specified range
Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range.

• If within the specified range

8. Command the Secondary Air Injection System to Active with a scan tool. Verify the scan tool Secondary Air Injection Pressure Sensor parameter increases between 6-14 kPa (0.9-2.0 psi).

• If not within the specified range
Refer to Circuit/System Testing-Secondary Air Injection System Pressure Not In Range.

• If within the specified range

9. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

10. Verify the DTC does not set.

• If the DTC sets
Refer to Circuit/System Verification-step 1

• If the DTC does not set

11. All OK

Circuit/System Testing

Secondary Air Injection Pump Malfunction

1. Vehicle OFF, disconnect the KR25 secondary air injection pump relay.

2. Verify a test lamp illuminates between the B+ circuit terminal 87 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Vehicle OFF

2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.

• If the test lamp does not illuminate and the circuit fuse is open

1. Vehicle OFF

2. Test for infinite resistance between the B+ circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Disconnect the harness connector at the G21 secondary air injection pump.

4. Test for infinite resistance between the control circuit terminal 1 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

5. Test or replace the G21 secondary air injection pump

• If the test lamp illuminates

3. Disconnect the harness connector at the G21 secondary air injection pump.

4. Vehicle OFF and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the G21 secondary air injection pump ground circuit terminal 2 and ground.

• If 10 ohms or greater

1. Vehicle OFF.

2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

5. Connect the harness connector at the G21 secondary air injection pump.

6. Connect a 40 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30.

Note: To prevent the secondary air injection pump from overheating, do not operate the pump consecutively for greater than 2 minutes. The pump is provided with a thermal protector that will automatically reset when allowed to cool.

7. Verify the G21 secondary air injection pump is activated.

• If the G21 secondary air injection pump does not activate

1. Vehicle OFF, disconnect the harness connector at the G21 secondary air injection pump.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms,

3. Test or replace the G21 secondary air injection pump.

• If the G21 secondary air injection pump activates

8. Test or replace the KR25 secondary air injection pump relay.

Secondary Air Injection System Pressure Not In Range

1. Verify the following conditions do not exist:

* Hoses/pipes restricted or blocked

* Hoses/pipes leaking or disconnected

* Damaged secondary air injection check valve

* Restricted or blocked cylinder head secondary air injection inlet ports and passages

• If a condition is located
Repair or replace the affected component as necessary.

• If all components test normal

2. Remove the Q29 secondary air injection solenoid valve.

3. Connect the harness connector at the Q29 secondary air injection solenoid valve.

4. Connect the secondary air injection pipe to the Q29 secondary air injection solenoid valve.

5. Vehicle in Service Mode, command the Secondary Air Injection System to Active with a scan tool. Verify there is airflow through the Q29 secondary air injection solenoid valve.

• If NO airflow
Replace the Q29 secondary air injection solenoid valve.

• If airflow

6. Command the Secondary Air Injection Pump Relay ON with a scan tool. Verify there is NO airflow through the Q29 secondary air injection solenoid valve.

• If airflow
Replace the Q29 secondary air injection solenoid valve.

• If no airflow

7. Replace the G21 secondary air injection pump.

Component Testing

Relay Test

1. Vehicle OFF, disconnect the appropriate relay.

2. Test for 70-110 ohms between terminals 85-86.

• If not within the specified range
Replace the relay.

• If within the specified range

3. Test for infinite resistance between the terminals listed below:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

• If less than infinite resistance
Replace the relay.

• If infinite resistance

4. Install a 15 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.

5. Test for less than 2 ohms between terminals 30 and 87.

• If 2 ohms or greater
Replace the relay.

• If less than 2 ohms

6. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)

* Secondary Air Injection Pump Replacement Service and Repair

* Secondary Air Injection Check Valve Replacement Service and Repair for secondary air injection solenoid valve replacement

* Secondary Air Injection Pipe Replacement Secondary Air Injection Pipe Replacement

* Secondary Air Injection Pump Air Cleaner Hose Replacement Secondary Air Injection Pump Air Cleaner Hose Replacement