P1445
DTC P1442 Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 1DTC P1445 Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 2
DTC P2441 secondary Air Injection System Switching Valve Stuck Close Bank1
DTC Detection Condition:
The Secondary Air Injection (AI) system pumps air to the exhaust port to accelerate the activation of the catalyst. The secondary air injection system consists of the ECM, air pump, Air Switching Valve (ASV) (EASV), No. 2 Air Switching Valve (No. 2 ASV) (ASV1, 2), pressure sensor and Air Injection Control Driver (AID). The Air Switching Valve (ASV) (EASV) is an electromagnetic type and No. 2 Air Switching Valve (No. 2 ASV) (ASV1, 2) is a vacuum type.
The secondary air injection system pumps pressurized air to the exhaust port by the air pump through the ASV and No. 2 ASV. The ASV assists the No. 2 ASV. The No. 2 ASV also controls air supply.
The ECM sends signals to the AID, and then the AID operates the air pump and ASV. The pressure sensor detects pressure and exhaust pulsation in the system when the system operates and when it does not operate, and sends the data to the ECM.
MONITOR DESCRIPTION
Monitor Strategy:
Typical Malfunction Thresholds (Part 1):
Typical Malfunction Thresholds (Part 2):
Typical Malfunction Thresholds (Part 1):
Typical Malfunction Thresholds (Part 2):
The ECM detects pressure change with the pressure sensor to determine malfunctioning parts in the system, and stores the DTCs. The ECM measures pressure and/or exhaust pulsation of the system at 6 points, A to F, when the air injection system is in operation or when not in operation. When the pressure is high, the ECM determines that the pump operates. When exhaust pulsation is detected, the ECM determines that the Air Switching Valve (ASV) is open. The ECM determines malfunction parts based on the measured value, and stores the DTCs.
Points A and B: ECM detects pressure changes (decrease), and determines that the No. 2 Air Switching Valve (No. 2 ASV) is open.
Points C and F: ECM detects pressure and exhaust pulsation, and determines the pressure pattern of the system.
Point D: ECM operates the system, as indicated by the dashed lines, to determine which of the No. 2 ASV is malfunctioning only when pressure changes cannot be detected at point A or B.
Point E:ECM detects exhaust pulsation to determine the condition of the system.
MONITOR RESULT
Refer to CHECKING MONITOR STATUS Mode 6 Data
Wiring Diagram:
Step 1:
Step 1(Continued)-4:
Step 4(Continued)-5:
Step 5(Continued)-6:
Step 7-8:
Step 9-10:
INSPECTION PROCEDURE
HINT: Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.