System Description
The DTC P2430 Secondary Air Injection (AIR) System Pressure Sensor Circuit diagnostic detects an out of range sensor signal. The AIR system helps reduce exhaust emissions. The system forces fresh filtered air into the exhaust stream in order to accelerate the catalyst operation. An electric air pump, the AIR pump, provides filtered air on demand to the AIR shut-off valve. The AIR shut-off valve controls the flow of air from the AIR pump to the exhaust manifold. The AIR solenoid valve supplies the manifold vacuum that is used to operate the AIR shut-off valve. A pressure sensor is used to monitor the air flow from the AIR pump. The powertrain control module (PCM) supplies the pressure sensor with a 5-volt reference, an electrical ground, and a signal return circuit that has a 5-volt bias. By comparing the measured pressure against the expected pressure the pressure sensor can detect faults in the AIR pump, AIR shut-off valve, and the AIR solenoid valve. The pressure sensor can also detect leaks in the secondary AIR system plumbing.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2430 Secondary Air Injection (AIR) System Pressure Sensor Circuit
Conditions for Running the DTC
| • | The ignition is ON or the engine is running. |
| • | DTC P2430 runs continuously once the above condition has been met. |
Conditions for Setting the DTC
The pressure sensor signal is less than 0.1 volt for at least 0.5 seconds.
OR
The pressure sensor signal is more than 4.8 volts for at least 0.5 seconds.
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL). |
| • | The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Freeze Frame buffer. |
Conditions for Clearing the MIL/DTC
| • | The MIL turns OFF after 3 consecutively passing trips without a fault present. |
| • | A DTC will clear after 40 consecutive warm-up cycles have occurred without a fault. |
| • | A DTC can be cleared by using the scan tool Clear Information function. |
Diagnostic Aids
| • | An intermittent malfunction may be caused by a fault in an AIR pressure sensor electrical circuits. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions . |
| • | If the DTC cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set. |
| • | Operating the vehicle in Check Mode will increase the ability of the PCM to detect engine control system malfunctions. Refer to Check Mode in Service Bay Test . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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The Diagnostic System Check - Vehicle prompts the technician to complete some basic checks and store the Freeze Frame data on the scan tool, if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
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This step determines if DTC P2430 is the result of a hard failure or an intermittent condition. Normal pressure sensor input voltage is approximately 1.6 volts with the ignition ON, AIR pump OFF.
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This step checks for an open or a short in the pressure sensor 5-volt reference.
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This step checks for an open or short in the pressure sensor input circuit.
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This step checks for an open in the pressure sensor ground circuit.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views | ||||
Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | |
Is the pressure sensor input circuit voltage within the specified value? | 1.5-1.6 V | Go to Step 3 | Go to Step 4 | |
3 |
Did the pressure sensor voltage increase to at least the specified value when the AIR pump was ON? | 1.9-2.1 V | Go to Diagnostic Aids | Go to Step 4 |
Does the voltage equal the specified value? | 5 V | Go to Step 5 | Go to Step 6 | |
Measure the voltage from the pressure sensor input circuit on the harness side using a DMM. Is the voltage near the specified value? | 4.9 V | Go to Step 8 | Go to Step 7 | |
6 | Repair the open in the reference voltage circuit of the pressure sensor between the sensor and SP108. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | Go to Step 12 | -- |
7 |
Was a repair necessary? | -- | Go to Step 12 | Go to Step 11 |
Probe the pressure sensor ground circuit on the harness side with a test lamp connected to B+. Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 9 | |
9 | Repair the open in the ground circuit of the pressure sensor between the sensor and the splice in the sensor ground circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | Go to Step 12 | -- |
10 | Replace the AIR pressure sensor. Refer to Secondary Air Injection Pressure Sensor Replacement . Is the action complete? | -- | Go to Step 12 | -- |
11 | Replace the powertrain control module (PCM). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the action complete? | -- | Go to Step 12 | -- |
12 |
Does the DTC run and pass? | -- | Go to Step 13 | Go to Step 2 |
13 | With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |
