P2433
DTC P2433 (WITH RPO CODE NU3)
SYSTEM DESCRIPTION
The DTC P2433 secondary air injection (AIR) system pressure sensor circuit high voltage diagnostic monitors the circuit for a high voltage. The 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 AIR 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. By comparing the measured pressure against the expected pressure, the PCM can detect faults in the AIR pump, the AIR control/shut-off valve, and the exhaust check valve. The pressure sensor can also detect leaks in the AIR system plumbing.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
- DTC P2433 Secondary Air Injection (AIR) System Pressure Sensor Circuit High Voltage
CONDITIONS FOR RUNNING THE DTC
- DTCs P0641, P0651, P0606 are not set.
- The ignition is ON or the engine is running.
- DTC P2433 runs continuously when the above conditions are met.
CONDITIONS FOR SETTING THE DTC
The pressure sensor signal is more than 4.8 volts for at least 12.5 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 PCM illuminates the MIL.
- A DTC will clear the 40 consecutive warm-up cycles have occurred without a fault.
- A DTC can be cleared by using the scan tool Clear Information function.
TEST
