Dtc P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1
DESCRIPTION
MONITOR DESCRIPTION
MONITOR STRATEGY
CONFIRMATION DRIVING PATTERN
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR (AIR PRESSURE SENSOR - ECM)
INSPECT ECM (SENSOR POWER SOURCE CIRCUIT)
READ DATA LIST (PUMP PRESSURE (ABSOLUTE))
DTC P2431 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank1 |
DTC P2432 Secondary Air Injection System Air Flow / Pressure Sensor Circuit Low Bank1 |
DTC 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, an air 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 air 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.
DTC No.
| DTC Detection Condition
| Trouble Area
|
P2431
| Air pressure sensor indicates less than 45.63 kPa (342 mmHg), or more than 135 kPa (1013 mmHg) (2 trip detection logic)
| - Air pressure sensor
- Open or short in air pressure sensor circuit
- ECM
|
P2432
| While engine running, voltage output of air pressure sensor remains below 0.5 V (1 trip detection logic)
| - Air pressure sensor
- Open or short in air pressure sensor circuit
- ECM
|
P2433
| While engine running, voltage output of air pressure sensor remains above 4.5 V (1 trip detection logic)
| - Air pressure sensor
- Open or short in air pressure sensor circuit
- ECM
|
MONITOR DESCRIPTION
The ECM monitors the pressure in the secondary air passage using the air pressure sensor located on the cylinder head cover.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 air pressure sensor or circuit and stores a DTC.
MONITOR STRATEGY
Required Sensors/Components
| Air pressure sensor
|
Frequency of Operation
| Continuous
|
CONFIRMATION DRIVING PATTERN
- NOTICE:
- This Secondary 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 GTS is prohibited, the GTS display indicates the prohibition (WAIT or ERROR).
If ERROR is displayed on the GTS during the test, stop the engine for 10 minutes, and then try again.
- Performing the Secondary Air Injection Check repeatedly may cause damage to the secondary air injection system. If necessary, leave an interval of several minutes between System Check operations to prevent the system from overheating.
- When performing the Secondary 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 Secondary Air Injection Check operation finishes.
- Start the engine and warm it up.
- Turn the ignition switch off.
- Connect the GTS to the DLC3.
- Turn the ignition switch to ON.
- Turn the GTS on.
- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the GTS on.
- Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Automatic Mode.
- Start the engine after the GTS initialization is finished.
- Perform the System Check operation by pressing Next.
- Perform the following to confirm the secondary air injection system pending DTCs: Press the Exit.
- Check for pending DTCs.
- HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- After the "Air injection check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
- Input the DTC: P2431, P2432 or P2433.
- Check the DTC judgment result.
GTS Display
| Description
|
NORMAL
| - DTC judgment completed
- System normal
|
ABNORMAL
| - DTC judgment completed
- System abnormal
|
INCOMPLETE
| - DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
|
N/A
| - Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
|
- HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- Turn the ignition switch off.
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Read freeze frame data using the GTS. 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.
| 1.CHECK HARNESS AND CONNECTOR (AIR PRESSURE SENSOR - ECM) |
Disconnect the air pressure sensor connector.
Disconnect the ECM connectors.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
C137-1 (E2) - C153-25 (EAIP)
| Always
| Below 1 Ω
|
C137-2 (AIP) - C153-26 (AIP)
| Always
| Below 1 Ω
|
C137-3 (VC) - C153-20 (VCAI)
| Always
| Below 1 Ω
|
C137-2 (AIP) or C153-26 (AIP) - Body ground
| Always
| 10 kΩ or higher
|
C137-3 (VC) or C153-20 (VCAI) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 2.INSPECT ECM (SENSOR POWER SOURCE CIRCUIT) |
Disconnect the air pressure sensor connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection
| Switch Condition
| Specified Condition
|
C137-3 (VC) - C137-1 (E2)
| Ignition switch ON
| 4.5 to 5.5 V
|
Text in Illustration*a
| Front view of wire harness connector
(to Air Pressure Sensor)
|
| 3.READ DATA LIST (PUMP PRESSURE (ABSOLUTE)) |
Connect a pressure gauge to the air pressure sensor as shown in the illustration.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Air pump pressure (absolute).
Check that the pressure displayed on the GTS fluctuates when applying the pressure to the air pressure sensor with the pressure gauge.
- OK:
- Pressure fluctuates in response to pressure applied with pressure gauge.
- HINT:
- The GTS displays the air pump pressure (Air pump pressure (absolute)) as absolute pressure.
| | REPLACE AIR PRESSURE SENSOR |
|
|
