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The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the air switching valve in the secondary air injection system. If there is a defect in the sensor or the sensor circuit, the voltage level deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the pressure sensor or circuit and sets a DTC. MONITOR STRATEGY Related DTCs P2431: Air flow/Pressure sensor circuit rationality P2432: Air flow/Pressure sensor circuit range check (Low voltage) P2433: Air flow/Pressure sensor circuit range check (High voltage) P2436: Air flow/Pressure sensor circuit rationality P2437: Air flow/Pressure sensor circuit range check (Low voltage) P2438: Air flow/Pressure sensor circuit range check (High voltage) Required Sensors/Components (Main) Pressure sensor Required Sensors/Components (Related) - Duration P2432, P2433, P2437, P2438: 0.5 seconds P2431, P2436: 5 seconds MIL Operation P2432, P2433, P2437, P2438: Immediate P2431, P2436: 2 driving cycles TYPICAL ENABLING CONDITIONS P2431 and P2436: Monitor runs whenever following DTCs not present P2432, P2433, P2437, P2438 (AIR Pressure Sensor - Low/High) Starter OFF Battery voltage 8 V or more Ignition switch ON P2432, P2433, P2437 and P2438 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2431-P2433... |