1Ur-Fe Engine Control. Dtc P2444 Secondary Air Injection System Pump Stuck On Bank1

DTC No.	DTC Detection Condition	Trouble Area
P2444	Secondary air pressure is higher than 2.5 kPa (19 mmHg) despite the ECM commanding the air pump to turn off (2 trip detection logic).	Short in air pump circuit Open or short in pressure sensor circuit Pressure sensor Air injection control driver ECM
P2445	Secondary air pressure is below 1 kPa (8 mmHg) despite the ECM commanding the air pump to turn on (2 trip detection logic).	Air pump assembly Open in air pump circuit Air injection system piping Pressure sensor Open or short in pressure sensor circuit Air injection control driver EGR valve assembly ECM Open or short in air pump heater circuit No. 2 integration relay (AIR PMP HTR)

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 mainly indicate a malfunction in which the air pump is stuck off.

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 Secondary 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 Secondary 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 Secondary Air Injection Check operation finishes.

Start the engine and warm it up.
Turn the engine switch off.
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) (Click here).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) 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 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 "Secondary 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 or P2445.

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 engine switch off.

WIRING DIAGRAM

Refer to DTC P0412 (Click here).

INSPECTION PROCEDURE

HINT:

By using the GTS to perform the Secondary 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 / Secondary Air Injection Check / Automatic Mode after the repair.
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.

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.

1.CHECK FOR ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444 OR P2445)

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

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

Read DTCs.

Result
Result	Proceed to
P2444 and/or P2445 is output (w/ Air Pump Heater)	A
P2444 and/or P2445 is output (w/o Air Pump Heater)	B
P2444 and/or P2445 and P0418 are output	C
P2444 and/or P2445 and other DTCs (except P0418) are output	D

HINT:

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

Go to step 8

GO TO AIR PUMP INSPECTION PROCEDURE (Click here)

GO TO DTC CHART (Click here)

A

2.CHECK FREEZE FRAME DATA

Connect the GTS to the DLC3.

Turn the engine switch on (IG) and turn the GTS on.

Read the values of Air Pump Freeze, Air Switching Valve Freeze and Air Switching Valve2 Freeze from the freeze frame data recorded previously.

Referring to the following table, proceed to the appropriate step according to the result of the data reading.

Result
Result
Proceed to
Air Pump Freeze
Air Switching Valve Freeze
Air Switching Valve2 Freeze
OFF
OFF
OFF
A
Except above
B

Go to step 8

A

3.PERFORM ACTIVE TEST USING GTS (ACTIVATE THE AIR PUMP HEATER)

Land Cruiser. Urj200, 202 Grj200 Vdj200.1Ur-Fe Engine Control.Sfi System.
Dtc
P2444 Secondary Air Injection System Pump Stuck On Bank1

Disconnect the air pump connector.

Connect the GTS to the DLC3.

Turn the engine switch on (IG) and turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT/ Active Test / Activate the Air Pump Heater.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
C139-1 (APH+) - Body ground
Activate the Air Pump Heater is ON
11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to Air Pump Assembly)

Text in Illustration
*a	Front view of wire harness connector (to Air Pump Assembly)

Reconnect the air pump connector.

Go to step 5

OK

4.INSPECT AIR PUMP ASSEMBLY (HEATER RESISTANCE)

Inspect the air pump assembly (Click here).

REPLACE AIR PUMP (Click here)

OK

5.INSPECT NO. 2 INTEGRATION RELAY (AIR PMP HTR)

Inspect the No. 2 integration relay (AIR PMP HTR) (Click here).

REPLACE AIR PUMP HEATER RELAY (AI-PMP HTR)

OK

6.CHECK NO. 2 INTEGRATION RELAY (AIR PMP HTR) (POWER SOURCE)

Remove the No. 2 integration relay (AIR PMP HTR).

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
for RHD
Tester Connection
Condition
Specified Condition
1X-1 - Body ground
Always
11 to 14 V
for LHD
Tester Connection
Condition
Specified Condition
1Y-1 - Body ground
Always
11 to 14 V
Text in Illustration
*a
Front view of wire harness connector
(to No. 2 integration relay)

for RHD
Tester Connection	Condition	Specified Condition
1X-1 - Body ground	Always	11 to 14 V

for LHD
Tester Connection	Condition	Specified Condition
1Y-1 - Body ground	Always	11 to 14 V

Text in Illustration
*a	Front view of wire harness connector (to No. 2 integration relay)

Reinstall the No. 2 integration relay (AIR PMP HTR).

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.CHECK HARNESS AND CONNECTOR (AIR PUMP - AIR PUMP HEATER RELAY (AIR PMP HTR), BODY GROUND)

Remove the No. 2 integration relay (AIR PMP HTR).

Disconnect the air pump connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
1P-9 - C139-1 (APH+)
Always
Below 1 Ω
C139-3 (APHG) - Body ground
Always
Below 1 Ω
1P-9 or C139-1 (APH+) - Body ground
Always
10 kΩ or higher

Reinstall the No. 2 integration relay (AIR PMP HTR).

Reconnect the air pump connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.PERFORM ACTIVE TEST USING GTS (SECONDARY AIR INJECTION SYSTEM OPERATION)

Start the engine and warm it up.

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary 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 GTS 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 GTS indicate the conditions shown in the table below.

Standard:

GTS Operation
Air Pump
Air Switching Valve
PRESSURE*
AIR PUMP: ON, ASV: OPEN
ON
ON
1 kPa or higher [A]
AIR PUMP: OFF, ASV: CLOSE
OFF
OFF
Below 2.5 kPa [B]
*: Average pumping pressure. The pressure should be 1 kPa or higher when the secondary air injection system operates.
Standard:
The pressures for [A] and [B] should differ by 1 kPa or more.

Turn the engine switch off.
NOTICE:
1. 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.
2. Performing Secondary 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.
3. When performing the Secondary 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.
4. Turn the engine switch off when the Secondary Air Injection Check operation finishes.

Go to step 10

OK

9.CHECK WHETHER DTC OUTPUT RECURS (DTC P2444 OR P2445)

Start the engine and warm it up.

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Clear DTCs (if stored) (Click here).

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 ENTER (Next).

Perform the following to confirm the secondary air injection system pending codes: Press the Exit button.

Check pending DTCs.

Turn the engine switch off.
NOTICE:
1. When performing the Secondary 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.
2. Turn the engine switch off when the Secondary Air Injection Check operation finishes.
Result
Result
Proceed to
P2444 or P2445 is output
A
No pending DTC is output
B

CHECK FOR INTERMITTENT PROBLEMS (Click here)

A

10.INSPECT AIR SWITCHING VALVE ASSEMBLY (PRESSURE SENSOR)

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Data List / Air pump pressure (Absolute) and Air Pump2 Pressure (Absolute).

Check the pressure displayed on the GTS.
Standard pressure:
45 to 135 kPa
HINT:
The GTS displays the air pump pressure as absolute pressure.

Result
Result	Proceed to
OK	A
NG (for Bank 1)	B
NG (for Bank 2)	C

REPLACE AIR SWITCHING VALVE ASSEMBLY (Click here)

A

11.CHECK SECONDARY AIR INJECTION SYSTEM PIPE CONNECTIONS

Check that all the pipes and hoses between the air pump and air switching valve are securely connected.

Inspect the pipes and hoses for blockages and damage.
OK:
Secondary air injection system piping has no blockages or damage.

REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING

OK

12.INSPECT AIR INJECTION CONTROL DRIVER (AIR INJECTION CONTROL DRIVER POWER SOURCE CIRCUIT)

Disconnect the air injection control driver connectors.

Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified Condition
C61-1 (E) - Body ground
Always
Below 1 Ω

Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Condition
Specified Condition
C60-1 (BATT) - Body ground
Always
11 to 14 V (near battery voltage)
C61-5 (+B) - Body ground
Engine switch on (IG)
11 to 14 V (near battery voltage)
Text in Illustration
*a
Front view of wire harness connector
(to Air Injection Control Driver)

REPAIR OR REPLACE AIR INJECTION CONTROL DRIVER POWER SOURCE CIRCUIT

OK

13.CHECK HARNESS AND CONNECTOR (ECM - AIR INJECTION CONTROL DRIVER)

Disconnect the ECM connector.

Disconnect the air injection control driver connectors.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

for RHD
Tester Connection
Condition
Specified Condition
C46-54 (AIRP) - C61-4 (SIP)
Always
Below 1 Ω
C46-54 (AIRP) or C61-4(SIP) - Body ground
Always
10 kΩ or higher

for LHD
Tester Connection
Condition
Specified Condition
C45-54 (AIRP) - C61-4 (SIP)
Always
Below 1 Ω
C45-54 (AIRP) or C61-4(SIP) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

14.CHECK AIR PUMP ASSEMBLY

Inspect the air pump assembly (Click here).

Go to step 17

Go to step 15

15.REPLACE AIR PUMP ASSEMBLY

Replace the air pump assembly (Click here).

NEXT

16.CHECK WHETHER DTC OUTPUT RECURS (DTC P2444 OR P2445)

Start the engine and warm it up.

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Clear DTCs (if stored) (Click here).

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 ENTER (Next).

Perform the following to confirm the secondary air injection system pending codes: Press the Exit button.

Check pending DTCs.
OK:
No pending DTC is output.

Turn the engine switch off.
NOTICE:
1. When performing the Secondary 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.
2. Turn the engine switch off when the Secondary Air Injection Check operation finishes.

Go to step 17

END

17.PERFORM ACTIVE TEST USING GTS

Disconnect the air injection control driver connector.

Connect terminals DI and SIV of the wire harness connector for the air injection control driver.
Text in Illustration
*1
Air Injection Control Driver
*2
ECM
*a
Front view of wire harness connector
(to Air Injection Control Driver)

Connect the GTS to the DLC3.

Turn the engine switch on (IG) and turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP: ON, ASV 1: OPEN, ASV 2: OPEN.
HINT:
When Manual Mode is selected, the GTS 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.

Measure the voltage between the SIV and E terminals of the ECM connector when the secondary air injection system is ON and OFF.

Turn the engine switch off.
NOTICE:
1. Performing Secondary 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.
2. When performing the Secondary 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.
3. Turn the engine switch off when the Secondary Air Injection Check operation finishes.
Standard Voltage:

Tester Connection
Condition
Specified Condition
C61-3 (SIV) - C61-1 (E)
AIR PUMP: ON, ASV: OPEN
0.5 to 2 V
C61-3 (SIV) - C61-1 (E)
AIR PUMP: OFF, ASV: CLOSE
11 to 14 V

Connect terminals DI and SIP of the wire harness connector for the air injection control driver.
Text in Illustration
*1
Air Injection Control Driver
*2
ECM
*a
Front view of wire harness connector
(to Air Injection Control Driver)

Connect the GTS to the DLC3.

Turn the engine switch on (IG) and turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Utility / Secondary Air Injection Check / Manual Mode / AIR PUMP: ON, ASV 1: OPEN, ASV 2: OPEN.
HINT:
When Manual Mode is selected, the GTS 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.

Measure the voltage between the SIP and E terminals of the ECM connector when the secondary air injection system is ON and OFF.

Turn the engine switch off.
NOTICE:
1. Performing Secondary 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.
2. When performing the Secondary 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.
3. Turn the engine switch off when the Secondary Air Injection Check operation finishes.
Standard Voltage:

Tester Connection
Condition
Specified Condition
C61-4 (SIP) - C61-1 (E)
AIR PUMP: ON, ASV: OPEN
0.5 to 2 V
C61-4 (SIP) - C61-1 (E)
AIR PUMP: OFF, ASV: CLOSE
11 to 14 V

Reconnect the air injection control driver connector.

REPLACE ECM (Click here)

OK

18.REPLACE AIR INJECTION CONTROL DRIVER

Replace the air injection control driver (Click here).

NEXT

19.CHECK WHETHER DTC OUTPUT RECURS (DTC P2444 OR P2445)

Start the engine and warm it up.

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Clear DTCs (if stored) (Click here).

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 ENTER (Next).

Perform the following to confirm the secondary air injection system pending codes: Press the Exit button.

Check pending DTCs.
OK:
No pending DTC is output.

Turn the engine switch off.
NOTICE:
1. When performing the Secondary 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.
2. Turn the engine switch off when the Secondary Air Injection Check operation finishes.

REPLACE ECM (Click here)

END

Result			Proceed to
Air Pump Freeze	Air Switching Valve Freeze	Air Switching Valve2 Freeze	Proceed to
OFF	OFF	OFF	A
Except above			B

GTS Operation	Air Pump	Air Switching Valve	PRESSURE*
AIR PUMP: ON, ASV: OPEN	ON	ON	1 kPa or higher [A]
AIR PUMP: OFF, ASV: CLOSE	OFF	OFF	Below 2.5 kPa [B]

Result	Proceed to
P2444 or P2445 is output	A
No pending DTC is output	B

*1	Air Injection Control Driver
*2	ECM
*a	Front view of wire harness connector (to Air Injection Control Driver)