P2431
1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2431-P2433, P2436-P2438: Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1
P2438 - Secondary Air Injection System Air Flow / Pressure Sensor Circuit High Bank 2
DESCRIPTION
Refer to DTC P0412 P0412.
Refer to DTC P0416 P0416.
MONITOR DESCRIPTION
The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the emission control valve set in the secondary air injection system. Using this pressure value, the ECM determines whether the secondary air injection system is malfunctioning or not.
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 stores a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
P2431 and P2436
P2432, P2433, P2437 and P2438
TYPICAL MALFUNCTION THRESHOLDS
P2431 and P2436
P2432 and P2437
P2433 and P2438
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
NOTICE:
* This Air Injection Check only allows technicians to operate the secondary 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 secondary 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 Air Injection Check repeatedly may cause damage to the secondary air injection system. If it is necessary to repeat the check, 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 the DTCs (even if no DTCs are stored, perform the clear DTC operation) Reading and Clearing Diagnostic Trouble Codes.
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 / 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 secondary air injection system pending codes: Press ENTER (Exit).
13. Check for pending DTCs.
OK:
No pending DTC is output.
14. After Air Injection Check is completed, check All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
15. Input the DTC: P2431, P2432, P2433, P2436, P2437 or P2438.
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 judgment result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
* If no permanent DTC is output, the system is normal.
* If a permanent DTC is output, the system is malfunctioning.
18. Turn the ignition switch off.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT
* Refer to "Data List / Active Test" [Air Pump Pressure (Absolute) and Air Pump2 Pressure (Absolute)] Data List / Active List.
* 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.
* Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
* Bank 2 refers to the bank that does not include the No. 1 cylinder.
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (EMISSION CONTROL VALVE SET - ECM)
(a) Disconnect the emission control valve set connector.
(b) Disconnect the ECM connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK TERMINAL VOLTAGE (VC OF EMISSION CONTROL VALVE SET)
(a) Disconnect the emission control valve set connector.
(b) Turn the ignition switch to 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. REPLACE EMISSION CONTROL VALVE SET
(a) Replace the emission control valve set.
HINT
* Replace the emission control valve set Removal.
* Replace the No. 2 emission control valve set Removal.
NEXT -- Continue to next step.
4. CHECK WHETHER DTC OUTPUT RECURS
(a) Perform the Confirmation Driving Pattern.
Result
B -- REPLACE ECM Removal
A -- END