P2431
2TR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2431-P2433: Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2433 - Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank1
DESCRIPTION
The secondary air injection system consists of an air pump, the air switching valve, a pressure sensor, the air injection control driver and the ECM. For a short time after cold engine starts, the air injection system pumps secondary air to the exhaust port of the cylinder head to purify the exhaust emissions. The secondary air is supplied by the air pump and is pumped to the exhaust port through the air switching valve.
The air injection control driver drives the air switching valve and the air pump according to command signals transmitted by the ECM. The pressure sensor detects the pressure in the secondary air passage when the air injection system is ON and OFF, and transmits pressure signal to the ECM.
The air injection control driver is not only equipped to drive the pump and valve, but also with a diagnosis function to detect malfunctions in the air injection system circuit.
HINT
As a large current is required to drive the air pump and air switching valve, an air injection control driver is included in this system.
MONITOR DESCRIPTION
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
TYPICAL ENABLING CONDITIONS
P2431 Case 1:
P2432 and P2433
TYPICAL MALFUNCTION THRESHOLDS
P2431:
P2432:
P2433:
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
NOTICE:
* This Air Injection Check only allows technicians to operate the Air Injection system for a maximum of 5 seconds.
Furthermore, the check can only be performed up to 4 times per trip. If the test is repeated, intervals of at least 30 seconds are required between checks.
While Air Injection system operation using the Techstream is prohibited, the Techstream display indicates the prohibition (WAIT or ERROR).
If ERROR is displayed on the Techstream during the test, stop the engine for 10 minutes, and then try again.
* Performing the Air Injection Check repeatedly may cause damage to the Air Injection system. If necessary, leave an interval of several minutes between System Check operations to prevent the system from overheating.
* When performing the Air Injection Check operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned to ON or the engine running.
* Turn the ignition switch off when the Air Injection Check operation finishes.
1. Start the engine and warm it up.
2. Turn the ignition switch off.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the Techstream on.
6. Clear DTCs (if output) DTC Check / Clear.
7. Turn the ignition switch off and wait for at least 30 seconds.
8. Turn the ignition switch to ON and turn the Techstream on.
9. Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.
10. Start the engine after the Techstream initialization is finished.
11. Perform the System Check operation by pressing ENTER (Next).
12. Perform the following to confirm the Air Injection system pending codes: Press the ENTER (Exit).
13. Check for pending DTCs.
OK:
No pending DTC is output.
14. After the "Air injection check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P2431, P2432 or P2433.
16. Check the DTC judgment result.
HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
17. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
18. Turn the ignition switch off.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
* Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
* If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - ECM)
(a) Disconnect the pressure sensor connector.
(b) Disconnect the ECM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
(d) Reconnect the pressure sensor connector.
(e) Reconnect the ECM connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. INSPECT ECM (SENSOR POWER SOURCE CIRCUIT)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(b) Turn the ignition switch ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE ECM Removal
OK -- Continue to next step.
3. READ DATA LIST (PUMP PRESSURE (ABSOLUTE))
(a) Connect a pressure gauge to the air pressure sensor as shown in the illustration.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Powertrain / Engine and ECT / Data List / Air pump pressure (absolute).
(f) Check that the pressure displayed on the Techstream fluctuates when applying the pressure to the pressure sensor with the pressure gauge.
Text in Illustration
OK:
Pressure fluctuates in response to pressure applied with pressure gauge.
HINT
The Techstream displays the air pump pressure (Air pump pressure (absolute)) as absolute pressure.
NG -- REPLACE PRESSURE SENSOR
OK -- REPLACE ECM Removal