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P2430



DTC P2430

Diagnostic Instructions

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

DTC Descriptor

DTC P2430
- Secondary Air Injection (AIR) System Pressure Sensor Circuit




Diagnostic Fault Information




Typical Scan Tool Data

Circuit/System Description

The secondary air injection (AIR) system aids in the reduction of hydrocarbon emissions during a cold start. The system forces fresh filtered air into the exhaust stream in order to accelerate the catalyst operation. An electric air pump, the secondary AIR injection pump, provides filtered air on demand to the AIR control solenoid valve/pressure sensor assembly. The AIR control solenoid valve/pressure sensor assembly controls the flow of air from the AIR pump to the exhaust manifold. The AIR valve relay supplies the current needed to operate the AIR control solenoid valve/pressure sensor assembly. A pressure sensor is used to monitor the air flow from the AIR pump. The powertrain control module (PCM) supplies the internal pressure sensor with a 5-volt reference, an electrical ground, and a signal circuit.

The AIR diagnostic uses 3 phases to test the AIR system:

1. DTCs P0411 and P2430 run during Phase 1
2. DTCs P2430 and P2440 run during Phase 2
3. DTC P2444 runs during Phase 3

During phase 1, both the AIR pump and the solenoid valve are activated. Normal secondary air function occurs. Expected system pressure is 8-10 kPa above barometric pressure (BARO).

During phase 2, only the AIR pump is activated. The solenoid valve is closed. Pressure sensor performance and solenoid valve deactivation are tested. Expected system pressure is 20-25 kPa above BARO.

During phase 3, neither the AIR pump nor the solenoid valve is activated. AIR pump deactivation is tested. Expected system pressure equals BARO.

In all 3 phases, testing is accomplished by comparing the measured pressure against the expected pressure. The PCM can detect faults in the AIR pump, AIR control solenoid valve/pressure sensor assembly, and the exhaust check valve. The pressure sensor can also detect leaks and restrictions in the secondary AIR system plumbing.

Conditions for Running the DTC

* DTCs P0412, P0418, P0606, P1635, P1639, P2432, P2433 are not set.
* More than 60 minutes has elapsed since the last cold start.
* The AIR pump is commanded ON.
* DTC P2430 runs continuously when the above conditions are met.

Conditions for Setting the DTC

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

Action Taken When the DTC Sets

DTC P2430 is a type B DTC.

Conditions for Clearing the MIL/DTC

DTC P2430 is a type B DTC.

Circuit/System Verification

1. Engine running, observe that the AIR Pressure Sensor parameter approximately equals BARO.
2. Engine running, enable the AIR solenoid with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 8-10 kPa above BARO.

• If less than the specified range, verify that the pump is activating. If pump activation is normal, inspect the hoses/pipes between the pump and the solenoid valve for leaks and obstructions.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the AIR solenoid valve.
2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal 1 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 PCM.

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

• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM.

• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the PCM.

4. Verify the scan tool AIR Pressure Sensor parameter is less than 0.5 volt.

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

5. Install a 3A fused jumper wire between the signal circuit terminal 2 and the 5-volt reference circuit terminal 3. Verify the scan tool AIR Pressure Sensor parameter is greater than 4.9 volts.

• 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 PCM.

6. Connect all electrical connectors.
7. Engine RUNNING, enable the AIR solenoid valve with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 8-10 kPa above BARO.

• If not within the specified range, continue with this procedure.

8. Remove the AIR inlet hose from the AIR pump.
9. Engine RUNNING, enable the AIR solenoid valve with a scan tool and observe that the AIR Pressure Sensor parameter increases to 8-10 kPa above BARO.

• If within the specified range, the AIR pump inlet hoses/pipes are restricted. Remove the restriction or replace the hose/pipe.
• If not within the specified range, continue with this procedure.

10. Disconnect the hose from the AIR pump outlet.
11. Disconnect the hose quick-connect from the AIR solenoid valve inlet.
12. Install a length of standard 1 inch I.D. (25.4 mm) hose from the AIR pump outlet to the AIR solenoid valve inlet.
13. Engine RUNNING, enable the AIR solenoid valve with a scan tool and observe that the AIR Pressure Sensor parameter increases to 8-10 kPa above BARO.

• If within the specified range, the AIR pump outlet hoses/pipes are restricted or leaking. Remove the restriction or replace the hose/pipe.
• If less than the specified range, replace the AIR pump.
• If more than the specified range, continue with this procedure.

14. Remove the AIR solenoid valve.
15. Leave the standard hose and harness connector connected.
16. Engine RUNNING, enable the AIR solenoid valve with a scan tool and observe that the AIR Pressure Sensor parameter increases to approximately 7 kPa above BARO.

• If more than the specified range, replace the AIR solenoid valve.
• If within the specified range, test/inspect the cylinder head for restriction.

Component Testing

Solenoid Valve

Apply fused battery voltage and ground to the solenoid and verify that the valve opens and closes completely as voltage is applied to and removed from the solenoid. Observe that the valve is not obstructed or leaking.

If the valve operates incorrectly, leaks, or is obstructed, remove the obstruction or replace the valve.

Repair Instructions

* Secondary Air Injection Pump Replacement
* Secondary Air Injection Solenoid Valve Replacement
* Secondary Air Injection Pump Hose Replacement
* Control Module References for control module replacement, setup and programming Engine Control Module Programming and Setup

Repair Verification

1. With the key ON and the engine OFF, observe that the AIR Pressure Sensor parameter is approximately equal to BARO.
2. With the engine running, enable the AIR pump with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 20-25 kPa above BARO.
3. With the engine running, enable the AIR Solenoid with a scan tool and observe that the AIR Pressure Sensor parameter equals approximately 8-10 kPa above BARO.

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