Part 1

1UR-FE ENGINE CONTROL: SFI SYSTEM: P2444,P2445,P2447: Secondary Air Injection System Pump Stuck On Bank1
P2447 - Secondary Air Injection System Pump Stuck Off Bank 2

DESCRIPTION

The secondary air injection system injects air into the exhaust port of the cylinder head using an electric air pump, starting when the engine is started cold and operating until the catalyst warms up, in order to promote combustion of unburned fuel and decrease the amount of hydrocarbons (HC) and carbon monoxide (CO) in the exhaust gas.









MONITOR DESCRIPTION

The ECM monitors the pressure in the secondary air passage using the pressure sensor located on the air switching valve of the secondary air injection system. The sensor measures the pressure in the secondary air passage and transmits a signal to the ECM.

If either of the following conditions occurs, the ECM interprets it as a malfunction of the secondary air injection system, and illuminates the MIL and stores a DTC:

- The pressure indicated by the pressure sensor does not reach threshold levels despite the ECM turning on the air pump.

- The pressure indicated by the pressure sensor exceeds threshold levels despite the ECM turning off the air pump.

Example:

- DTC P2444 mainly indicates a malfunction in which the air pump is stuck on.

- DTC P2445 and P2447 mainly indicate a malfunction in which the air pump is stuck off.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





















P2445, P2447 Secondary Air Injection Insufficient









TYPICAL MALFUNCTION THRESHOLDS

P2444 Air Pump is Stuck ON





P2445, P2447 Air Pump is Stuck OFF





P2445, P2447 Secondary Air Injection Insufficient





Secondary Air Injection ON (Condition 1)





Secondary Air Injection ON (Condition 2)





Secondary Air Injection ON (Condition 3)





Secondary Air Injection ON (Condition 4)





Secondary Air Injection OFF (Condition 1)





Secondary Air Injection OFF (Condition 2)





Secondary Air Injection OFF (Condition 3)





Secondary Air Injection OFF (Condition 4)





MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data.

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 engine switch turned on (IG) or the engine running.
- Turn the engine switch off when the Air Injection Check operation finishes.
- Start the engine and warm it up.

- Turn the engine switch off.

- Connect the Techstream to the DLC3.

- Turn the engine switch on (IG).

- Turn the Techstream on.

- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) DTC Check / Clear.

- Turn the engine switch off and wait for at least 30 seconds.

- Turn the engine switch on (IG) and turn the Techstream on.

- Enter the following menus: Powertrain / Engine and ECT / Utility / Air injection check / Automatic Mode.

- Start the engine after the Techstream initialization is finished.

- Perform the System Check operation by pressing ENTER (Next).

- Perform the following to confirm the secondary air injection system pending codes: Press ENTER (Exit).

- Check for pending DTCs.

OK:

No pending DTC is output.

- After "Air injection check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

- Input the DTC: P2444, P2445 or P2447.

- 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.
- If the judgment 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 no permanent DTC is output, the system is normal.
- If a permanent DTC is output, the system is malfunctioning.
- Turn the engine switch off.

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Determination by ECM monitoring:

The ECM locates malfunctions in the secondary air injection system by detecting the pressure in the secondary air injection passage between the air pump and air switching valve and stores a DTC. Soon after a cold engine start, the monitor runs for a short time while the secondary air injection system is both ON and OFF. The ECM detects both the pressure and the exhaust pulsation and compares them.

The following 8 patterns are secondary air injection system pressure conditions in the secondary air injection system passage.

Pressure Condition in Secondary Air Injection System Case 1





Pressure Condition in Secondary Air Injection System Case 2





Pressure Condition in Secondary Air Injection System Case 3





Pressure Condition in Secondary Air Injection System Case 4





Pressure Condition in Secondary Air Injection System Case 5





Pressure Condition in Secondary Air Injection System Case 6





Pressure Condition in Secondary Air Injection System Case 7





Pressure Condition in Secondary Air Injection System Case 8





If the detected pressure is high, the air pump is assumed to be ON and if it alternates sharply, the air switching valve is assumed to be open. The ECM locates malfunctions from the combination of pressures detected when the secondary air injection system is ON and OFF.

HINT
The exhaust pulsation value is calculated in the ECM. If the calculated value exceeds a certain level, the ECM determines that the exhaust pulsation is in the secondary air injection system.

HINT
- In case 3 and 7, as the pressure sensor detects a slight pump operation pulsation, the detected value is not constant. Since the pump outlet is blocked by closing the air switching valve, the average pressure is higher than in case 1 (approximately 12 to 20 kPa).
- In case 1, the average pressure is approximately 3 to 11 kPa. The value of 1 kPa indicated in the table above is a threshold for detecting pump malfunctions.






HINT
- By using the Techstream to perform the Air Injection Check operation in the System Check, the air-fuel ratio and the pressure in the secondary air injection system passage can be checked while the secondary air injection system is operating. This helps technicians to troubleshoot the system when it malfunctions. Furthermore, pending codes also can be checked by performing Utility / Air Injection Check / Automatic Mode after the repair.
- 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.
- System Check:

- The pressure in the secondary air passage can be checked using the Techstream.

- Start the engine and warm it up.

- Turn the engine switch off.

- Connect the Techstream to the DLC3.

- Turn the engine switch on (IG).

- Turn the Techstream on.

- Enter the following menus: Powertrain / Engine and ECT / Utility / Air Injection Check / Manual Mode / AIR PUMP: ON, ASV1: OPEN, ASV2: OPEN and AIR PUMP: OFF, ASV1 CLOSE, ASV2 CLOSE.

HINT
When Manual Mode is selected, the Techstream initialization (atmospheric pressure measurement) is performed automatically. The initialization takes 10 seconds. After the initialization, AIR PUMP and ASV operation can be selected.

- Start the engine.

- Perform the secondary air injection system forced operation while the engine is idling.

- Check that the air pump (AIR PUMP), air switching valve (ASV) and pressure in the secondary air injection system passage (PRESSURE) displayed on the Techstream indicate the conditions shown in the table below.

Standard:





- *1: Average pumping pressure (gauge pressure). The pressure should be 1 kPa or higher when the secondary air injection system operates.

- *2: The cumulative exhaust pulsation calculated by the ECM. If the calculated value exceeds a certain level, the ECM determines that the exhaust pulsation is in the secondary air injection system.

- Turn the engine switch off.

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 engine switch turned on (IG) or the engine running.
- Turn the engine switch off when the Air Injection Check operation finishes.
HINT
- 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 FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444, P2445 AND/OR P2447)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read DTCs.

Result





HINT
If any DTCs other than P0418, P2444, P2445 and/or P2447 are output, troubleshoot those DTCs first.

C -- GO TO DTC CHART SFI System

B -- GO TO AIR PUMP INSPECTION PROCEDURE
A -- Continue to next step.