Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2444 AND P2445)

Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON and push the intelligent tester main switch ON.
Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES.
Read the DTCs.

Result

RESULT CHART

Display (DTC output)	Proceed to
P2445	A
P2444	B
. P2444 and P2445	B
"P2444 and P2445" and other DTCs	C

HINT:

If any other codes besides P2444 or P2445 is output, perform the troubleshooting for those DTCs first.

B: GO TO step 7

C: GO TO DTC CHART

A: GO TO Next Step

CHECK AIR INJECTION SYSTEM PRESSURE

Start the engine and warm it up.
Turn the ignition switch OFF.
Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON and push the intelligent tester main switch ON.
Start the engine.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 1 and 2.
HINT:

OPERATION 1: AP: OFF; EASV: CLOSE; ASV1: CLOSE; ASV2: CLOSE

OPERATION 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN
Check that the PRESSURE on the intelligent tester.

Fig 1: Intelligent Tester Display - AIR INJ CHECK

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

This test only allows technicians to operate the AI system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
While the AI system operation using the intelligent tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (Al STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.
When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

Standard pressure

TESTER OPERATION CHART

Tester operation	Pressure
Operation 1	Less than 2.5 kPa
Operation 2	5 kPa or more

NG: GO TO step 4

OK: GO TO Next Step

CHECK WHETHER DTC OUTPUT RECURS
1. Start the engine and warm it up.
2. Turn the ignition switch OFF.
3. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Clear the DTCs (see DTC CHECK / CLEAR ).
6. Start the engine.
7. Perform ACTIVE TEST to operate the air injection system.
  NOTE:
  - Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / AUTOMATIC When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
  - Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.
8. After operating the secondary air injection system, confirm the pending codes for the secondary air injection system by entering the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES.
9. Read DTC and check DTC.
OK: DTC P2444 or P2445 for the secondary air injection system is not output.

NG: GO TO step 4

OK: CHECK FOR INTERMITTENT PROBLEMS
CHECK VACUUM HOSE
1. Remove the intake manifold (see REMOVAL ).
2. Check the vacuum hose connection between the pressure sensor and air switching valve.
  OK: The vacuum hose is securely connected.
3. Inspect the vacuum hose for blockage and damage.
OK: The vacuum hose has no blockage and damage.

NG: REPAIR OR REPLACE VACUUM HOSE

Fig 2: Identifying Vacuum Hose
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO Next Step
READ VALUE OF INTELLIGENT TESTER (AIR VOLTAGE)
1. Remove the intake manifold (see REMOVAL ).
2. Connect the pressure gauge to the pressure sensor as shown in the illustration.
3. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
4. Turn the ignition switch ON and push the intelligent tester main switch ON (Do not start engine).
5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / AIR PMP PRS (A).
  HINT:
  
  The value of AIR PMP PRS (A) in the DATA LIST shows absolute pressure.
6. Check that the pressure displayed on the intelligent tester fluctuates when applying the pressure to the pressure sensor with the pressure gauge.
Fig 3: Connecting Pressure Gauge To Pressure Sensor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Pressure fluctuates in response to the pressure applied with pressure gauge.

NG: REPLACE PRESSURE SENSOR

OK: GO TO Next Step
CHECK PIPING AND HOSES (CONNECTION OF ALL AIR INJECTION SYSTEM)
1. Remove the intake manifold (see REMOVAL ).
2. Check that ail the pipes and hoses between the air pump and air switching valve are securely connected.
  OK: All air injection pipes and hoses are securely connected.
3. Check all pipes and hoses for blockages and damage.
OK: All air injection pipes and hoses have no blockages and damage.

NG: REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING AND HOSES

Fig 4: Identifying Pipes And Hoses Of Air Injection System
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO Next Step

INSPECT AIR INJECTION CONTROL DRIVER (POWER SOURCE CIRCUIT)

Disconnect the A52 and A53 Air Injection Control Driver (AID)connectors.

Fig 5: Inspecting Air Injection Control Driver (Power Source Circuit)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch ON.

Measure the voltage between terminals A53-5 (+B) and A52-1 (BATT) of the AID and body ground.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
A53-5 (+B) - Body ground	10 V or more
A52-1 (BATT) - Body ground	10 V or more

Measure the resistance between the terminal A53-1 (E) of the AID and body ground.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
A53-1 (E) - Body ground	Below 1 Ω

Reconnect the AID connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 6: Inspecting Air Injection Control Driver (Power Source Circuit)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO Next Step

INSPECT ECM (AIRP AND AIRV VOLTAGE)

Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON and turn the tester ON.
When the air pump and air switching valve are operated using the intelligent tester, measure voltage between terminal E9-25 (AIRP) and E9-4 (AIRV) of the AID connector and body ground.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 1 and 2.

HINT:

OPERATION 1: AP: OFF; EASV: CLOSE; ASV1: CLOSE; ASV2: CLOSE

OPERATION 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN

Fig 7: Inspecting ECM (AIRP And AIRV Voltage)

NOTE:

This test only allows technicians to operate the AI system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
While the AI system operation using the intelligent tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (Al STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.
When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Air pump operation	Specified Condition
AIRP (E9-25) - Body ground	ON	10 V or more
AIRP (E9-25) - Body ground	OFF	3.5 to 7.7 V*

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Air switching valve (ASV) operation (EASV)	Specified Condition
AIRV (E9-4) - Body ground	OPEN	10 V or more
AIRV (E9-4) - Body ground	CLOSE	3.5 to 7.7 V*
HINT: *: 35 to 55% of the +B voltage.

NG: REPLACE ECM

OK: GO TO Next Step

CHECK HARNESS AND CONNECTOR (AIR INJECTION CONTROL DRIVER - ECM)
1. Check harness and connector (see ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO Next Step
INSPECT AIR PUMP (OPERATION)
1. Remove the hose between EASV and ASV.
2. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
3. Turn the ignition switch ON and turn the tester ON.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / AIR INJ CHECK / MANUAL / OPERATION 2.
5. When the air pump is operated, check that air comes out from the air pump.
HINT:

OPERATION 2: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: OPEN

Fig 8: Identifying Pipes And Hoses
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE:
- This test only allows technicians to operate the AI system for 5 seconds. Furthermore, the test can be performed 4 times a trip. If the test is repeated, intervals of at least 30 seconds are required between tests.
  While the AI system operation using the intelligent tester is prohibited, the tester displays the prohibition (WAIT or ERROR). If ERROR (Al STATUS NG) is displayed on the tester, stop the engine for 10 minutes and then try again.
- When performing the AIR INJ CHECK operation after the battery cable has been reconnected, wait for 7 minutes with the ignition switch turned ON or the engine running.
- Turn the ignition switch OFF when the AIR INJ CHECK operation finishes.
OK: Air comes out from the air pump

NG: REPLACE AIR PUMP

OK: CHECK WHETHER DTC OUTPUT NOT RECURS