Last Modified: 4-30-2014 6.6 C Doc ID: RM000001BRG002X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1442,P1445,P2441; Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 1; 2006 MY LX470 [05/2005 -        ]

DTC

P1442

Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 1

DTC

P1445

Stuck Close in Secondary Air Injection Vacuum Switching Valve Bank 2

DTC

P2441

Secondary Air Injection System Switching Valve Stuck Close Bank1

DESCRIPTION

Refer to DTC P0412 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0412; Secondary Air Injection System Switching Valve "A" Circuit+ .

DTC No.

DTC Detection Condition

Trouble Area

P1442

No. 2 air switching valve (bank 1) stuck closed:

No pressure change (decrease) after the ECM sends an open No. 2 air switching valve (bank 1) signal.

(2 trip detection logic)
  • VSV for air injection system circuit (bank 1)
  • Vacuum hose (VSV for air injection system - No. 2 air switching valve)
  • Air injector pipe (No. 2 air switching valve - exhaust manifold)
  • No. 2 air switching valve (bank 1)
  • VSV for air injection system (bank 1)
  • ECM

P1445

No. 2 air switching valve (bank 2) stuck closed:

No pressure change (decrease) after the ECM sends an open No. 2 air switching valve (bank 2) signal.

(2 trip detection logic)
  • VSV for air injection system circuit (Bank 2)
  • Vacuum hose (VSV for air injection system - No. 2 air switching valve )
  • Air injector pipe (No. 2 air switching valve - exhaust manifold)
  • No. 2 air switching valve (bank 2)
  • VSV for air injection system (bank 2)
  • ECM

P2441

Air switching valve stuck closed:

The pressure sensor does not detect exhaust pulsation when system operates. (All of air switching valve ON)

This DTC means either of the following conditions is met.

  1. Electromagnetic air switching valve stuck closed.
  2. Both of "No. 2 air switching valve (bank 1)" and "No. 2 air switching valve (Bank 2)" are stuck closed.

    (2 trip detection logic)
  • Vacuum hoses (Throttle body - VSVs for air injection system)
  • Air switching valve
  • Air injector pipe (No. 2 air switching valve - exhaust manifold)
  • Air injection hose
  • No. 2 air switching valve (bank 1 and/or 2)
  • VSV for air injection system (bank 1 and/or 2)
  • Air injection control driver
  • Air injection control driver circuit
  • ECM

MONITOR DESCRIPTION

Refer to DTC P1441, P1444 and P2440 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1441,P1444,P2440; Stuck Open in Secondary Air Injection Vacuum Switching Valve Bank 1+ .

MONITOR STRATEGY

Related DTCs

(Case 1) P1442 AIR VSV stuck close bank 1

(Case 2) P1445 AIR VSV stuck close bank 2

(Case 3) P2441 AIR valve stuck close

Required sensors/Components

AIR pressure sensor, AIR valve, AIR VSV bank 1, AIR VSV bank 2

Frequency of operation

Once per driving cycle

Duration

Within 60 seconds

MIL operation

2 driving cycles

Sequence operation

None

TYPICAL ENABLING CONDITIONS

Common conditions

This monitor runs whenever these DTCs are not present
  • P0010 - P0022: VVT system
  • P0031 - P0052: Front A/F sensor heater
  • P0100 - P0103: MAF sensor
  • P0110 - P0113: IAT sensor
  • P0115 - P0118: ECT sensor
  • P0120 - P2125: TP sensor
  • P0125: Closed loop
  • P0171 - P0175: Fuel trim
  • P0300 - P0308: Misfire
  • P0325 - P0333: Knock sensor
  • P0335: CKP sensor
  • P0340 - P0346: VVT sensor
  • P0351 - P0358: Igniter
  • P0441 - P2420: EVAP system
  • P0500: VSS
  • P1340: CMP sensor
  • P2195 - P2A03: A/F sensor
  • P2430 - P2433: AIR pressure sensor

Atmospheric pressure

45 kPa or higher

Battery voltage

11.5 V or higher

Sequence 1 - 5 are performed to monitor AIR

-

[Sequence 1]

-

Idle

ON

AIR

In operation

AIR pump

ON

AIR valve

ON

AIR VSV bank 1

ON (OFF)

AIR VSV bank 2

OFF (ON)

[Sequence 2]

-

Idle

ON

AIR

In operation

AIR valve

ON

AIR VSV bank 1

ON

AIR VSV bank 2

ON

[Sequence 3]

-

Engine RPM

Less than 3,750 rpm

AIR

In operation

AIR pump

ON

AIR valve

ON

AIR VSV bank 1

ON

AIR VSV bank 2

ON

[Sequence 4-a]

Performed when AIR pressure changes at sequence 2

Engine RPM

Less than 3,750 rpm

AIR

Not operating

AIR pump

OFF

AIR valve

OFF

AIR VSV bank 1

OFF

AIR VSV bank 2

OFF

[Sequence 4-b]

Performed when AIR pressure does not change at sequence 2

Engine RPM

Less than 3,750 rpm

AIR

Not operating

AIR pump

ON

AIR valve

ON

AIR VSV bank 1

ON (OFF)

AIR VSV bank 2

OFF (ON)

[Sequence 5]

-

Engine RPM

Less than 3,750 rpm

AIR

Not operating

AIR pump

OFF

AIR valve

ON

AIR VSV bank 1

OFF

AIR VSV bank 2

OFF

TYPICAL MALFUNCTION THRESHOLDS

Thresholds for Case 1

Averaged AIR pressure at sequence 3

More than 1 kPa

Cumulative AIR pressure pulse at sequence 3

More than 15 kPa

Averaged AIR pressure at sequence 5

Less than 5 kPa

Cumulative AIR pressure pulse at sequence 5

Less than 30 kPa

Thresholds for Case 2

Averaged AIR pressure at sequence 3

More than 1 kPa

Cumulative AIR pressure pulse at sequence 3

More than 15 kPa

Averaged AIR pressure at sequence 5

Less than 5 kPa

Cumulative AIR pressure pulse at sequence 5

Less than 30 kPa

Thresholds for Case 3

Averaged AIR pressure at sequence 3

More than 1 kPa

Cumulative AIR pressure pulse at sequence 3

Less than 15 kPa

Averaged AIR pressure at sequence 5

Less than 5 kPa

Cumulative AIR pressure pulse at sequence 5

Less than 30 kPa

MONITOR RESULT

Refer to CHECKING MONITOR STATUS 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: CHECKING MONITOR STATUS .

Monitor ID

Test ID

Scaling

Unit

Description

$71

$E1

Multiply by 0.01

g/sec.

AIR amount for AIR insufficient

$71

$E2

Multiply by 0.01

kPa

Averaged AIR pressure for AIR pump ON stuck

$71

$E3

Multiply by 0.01

kPa

Averaged AIR pressure for AIR pump OFF stuck

$71

$E4

Multiply by 0.01

kPa

AIR pressure pulse for AIR valve and AIR VSV open stuck

$71

$E5

Multiply by 0.01

kPa

AIR pressure pulse for AIR valve and AIR VSV close stuck

$71

$E6

Multiply by 0.01

kPa

AIR pressure difference for AIR valve

$71

$E7

Multiply by 0.01

kPa

AIR pressure difference for AIR VSV bank 1

$71

$E8

Multiply by 0.01

kPa

AIR pressure difference for AIR VSV bank 2

$71

$E9

Multiply by 0.01

kPa

AIR pressure pulse for AIR VSV stuck open bank 1 and bank 2

WIRING DIAGRAM

Refer to DTC P0412 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0412; Secondary Air Injection System Switching Valve "A" Circuit+ .

INSPECTION PROCEDURE

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.

PROCEDURE

1.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO SECONDARY AIR INJECTION SYSTEM DTCS)

(a) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(b) Turn the ignition switch ON and turn the tester ON.

(c) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(d) Read DTCs.

Result

Display (DTC Output)

Proceed to

"P1442 and/or P1445" and P2441

A

P1442 and/or P1445

B

"P1442 and/or P1445 and/or P2441" and other DTCs

C

HINT:

If any DTCs other than P1441 and/or P1444 and P2440 are output, troubleshoot those DTCs first.

B

GO TO STEP 5

C

GO TO DTC CHART

A

2.

CHECK VACUUM HOSES (THROTTLE BODY - VSV FOR AIR INJECTION SYSTEM)

(a) Check that the vacuum hoses between the throttle body and VSV for air injection system are securely connected.

OK:

The vacuum hoses are securely connected.

(b) Inspect the vacuum hoses for blockages and damage.

OK:

The vacuum hoses have no blockages and damage.
NG

REPAIR OR REPLACE VACUUM HOSES

OK

3.

CHECK PIPES AND HOSES (CONNECTION OF AIR INJECTION SYSTEM)

(a) Remove the intake manifold 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REMOVAL+ .

(b) Check all pipes and hoses of the air injection system.

OK:

All air injection pipes and hoses are securely connected.

(c) Check all pipes and hoses for blockage or damage.

OK:

All air injection pipes and hoses have no blockages and damage.
NG

REPAIR OR REPLACE AIR INJECTION SYSTEM PIPING AND HOSES

OK

4.

CHECK AIR SWITCHING VALVE (OPERATION)

(a) Remove the intake manifold 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE MECHANICAL: CYLINDER HEAD: REMOVAL+ .

(b) Remove the Air Switching Valve (ASV).

(c) Blow air into port A and check that air is not discharged from port B.

OK:

Not discharged

(d) Apply battery positive voltage across the terminals.

(e) Blow air into port A and check that air is discharged from port B.

OK:

Discharged

NG

REPLACE AIR SWITCHING VALVE AND GO TO STEP 6

OK

5.

CHECK NO. 2 AIR SWITCHING VALVE (OPERATION)

(a) Start the engine and warm it up.

(b) Turn the ignition switch OFF.

(c) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(d) Turn the ignition switch ON and push the intelligent tester main switch ON.

(e) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 5 and 6.

HINT:

OPERATION 5: AP: ON; EASV: OPEN; ASV1: OPEN; ASV2: CLOSE

OPERATION 6: AP: ON; EASV: OPEN; ASV1: CLOSE; ASV2: OPEN

NOTICE:

  • 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 (AI 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.

(f) Read value of the A/F BANK1 and BANK2 on the intelligent tester.

Air switching valve No. 2 operation

Air fuel ratio

Open

18 or more

Closed

Approximately 14.5

HINT:

  • When the No. 2 ASV operates normally, the A/F value is 18 or more when the valve is open, and approximately 14.5 when the valve is closed.
  • Perform the following procedures only on the bank of which the valve is not open.
NEXT

6.

CHECK VSV (FOR AIR INJECTION SYSTEM)

(a) Turn the ignition switch OFF.

(b) Disconnect the vacuum hoses from the VSV for air injection system.

(c) Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.

(d) Start the engine and turn the tester ON.

(e) When the air switching valve is operated using the intelligent tester, check that negative pressure from port A.

(f) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / AIR INJ CHECK / MANUAL / OPERATION 2.

HINT:

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

NOTICE:

  • 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 (AI 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:

Negative pressure from port A

(g) Reconnect the vacuum hose.
NG

GO TO STEP 10

OK

7.

CHECK VACUUM HOSES (AIR SWITCHING VALVE - VSV FOR AIR INJECTION SYSTEM)

(a) Check that the vacuum hoses between the No. 2 air switching valve(s) and VSV for air injection system are securely connected.

OK:

The vacuum hose(s) are securely connected.

(b) Check the vacuum hoses for blockages and damage.

OK:

The vacuum hoses have no blockages and damage.
NG

REPAIR OR REPLACE VACUUM HOSES

OK

8.

CHECK NO. 2 AIR SWITCHING VALVE (OPERATION)

(a) Remove the No. 2 air switching valve.

(b) Blow air into port B and check that air is not discharged from port C.

OK:

Not discharged from port C

(c) Apply vacuum 30 kPa (225 mmHg) to port A, blow air into port B and check that air is discharged from port C.

OK:

Discharged from port C

NG

REPLACE NO. 2 AIR SWITCHING VALVE

OK

9.

CHECK AIR INJECTION PIPE (NO. 2 AIR SWITCHING VALVE - EXHAUST MANIFOLD)

(a) Check that the air injection pipe between the No. 2 air switching valve(s) and exhaust manifold are securely connected.

OK:

The air injection pipe is securely connected.

(b) Check the air injection pipe for blockages and damage.

OK:

The air injection pipe has no blockages and damage.
NG

REPAIR OR REPLACE AIR INJECTION PIPE

OK

CHECK FOR INTERMITTENT PROBLEMS

10.

CHECK VSV (FOR AIR INJECTION SYSTEM)

(a) Disconnect the 2 vacuum hoses.

(b) Disconnect the VSV for air injection system connector.

(c) Blow air into port B. Check that air does not flow from port A.

OK:

Air does not flow from port A

(d) Apply battery positive voltage across the terminals. Then blow air into port B and check that air flows from port A.

OK:

Air flows from port A

NG

REPLACE VSV

OK

REPLACE ECM