2001 TOYOTA SEQUOIA Service Repair Manual

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Page 529 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17530
Port C
Port B Port A
Air
B17531
Port C
Port BPort A
Air
± DIAGNOSTICSENGINE
DI±327
521 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check air switching valve No.2 operation.
PREPARATION:
Remove

Page 530 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17516
Air
Port A
B17517
Air
Port A
DI±328
± DIAGNOSTICSENGINE
522 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check VSV for air injection control.
PREPARATION:
Disconnect the connector from the VS

Page 531 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17412
E8
AIV1
AIV2
B17437
V14
VSV Connector V15
Wire Harness Side:
± DIAGNOSTICSENGINE
DI±329
523 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check for open and short circuit in harness and connect

Page 532 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±330
± DIAGNOSTICSENGINE
524 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1442 Secondary Air Injection System Switching
Valve No.2 Stuck Close Bank 1
DTC P1445 Secondary Air Injection System Swit

DI±330
± DIAGNOSTICSENGINE
524 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1442 Secondary Air Injection System Switching
Valve No.2 Stuck Close Bank 1
DTC P1445 Secondary Air Injection System Switching
Valve No.2 Stuck Close Bank 2
DTC P2441 Secondary Air Injection System Switching
Valve Stuck Close Bank 1
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI±234.
DTC No.DTC Detection ConditionTrouble Area
P1442
Air switching valve No.2 (bank 1) stuck close:
No pressure change (decrease) after the ECM sends an open
air switching valve No.2 (bank 1) signal.
(2 trip detection logic)
VSV for air injection control circuit (Bank 1)
Vacuum hose (VSV for air injection control ± air switching
valve No.2)
Air injector pipe (Air switching valve No.2 ± exhaust manifold)
Air switching valve No.2 (Bank 1)
VSV for air injection control (Bank 1)
ECM
P1445
Air switching valve No.2 (bank 2) stuck close:
No pressure change (decrease) after the ECM sends an open
air switching valve No.2 (bank 2) signal.
(2 trip detection logic)
VSV for air injection control circuit (Bank 2)
Vacuum hose (VSV for air injection control ± air switching
valve No.2)
Air injector pipe (Air switching valve No.2 ± exhaust manifold)
Air switching valve No.2 (Bank 2)
VSV for air injection control (Bank 2)
ECM
P2441
Air switching valve stuck close:
The pressure sensor does not detect exhaust pulsation when
system operates. (All of air switching valve ON)
This DTC means either of following conditions.
(a) Electromagnetic air switching valve stuck closed.
(b) Both of ºair switching valve No.2 bank 1º and ºair switching
valve No.2 bank 2º stuck closed.
(2 trip detection logic)Vacuum hoses (Throttle body ± VSVs for air injection control)
Air switching valve
Air injector pipe (Air switching valve No.2 ± exhaust manifold)
Air injection hose
Air switching valve No.2 (Bank 1 and/or 2)
VSV for air injection control (Bank 1 and/or 2)
Air injection driver
Air injection driver circuit
ECM
MONITOR DESCRIPTION
Refer to DTC P1441, P1444 and P2440 on page DI±314.
DIDMS±01

Page 533 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSENGINE
DI±331
525 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR STRATEGY
P1442Air switching valve No. 2 (Bank 1) is stuck closed
Related DTCsP1445Air switching valve No. 2 (Bank 2) i

Page 534 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±332
± DIAGNOSTICSENGINE
526 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
P1442: Air switching valve No. 2 bank 1 is stuck closed
Detection CriteriaThreshold
Both of fol

DI±332
± DIAGNOSTICSENGINE
526 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
P1442: Air switching valve No. 2 bank 1 is stuck closed
Detection CriteriaThreshold
Both of following conditions are metCondition 1 and 2
1. Cumulative pressure pulsation15 kPa (113 mmHg) or more
(when AI ON (Air pump ON, all of air switching valves are ON)
2. Air pressure changeLess than 1 kPa (7.5 mmHg)
(when opening air switching valve No. 2 (Bank 1))
P1445: Air switching valve No. 2 bank 2 is stuck closed
Detection CriteriaThreshold
Both of following conditions are metCondition 1 and 2
1. Cumulative pressure pulsation15 kPa (113 mmHg) or more
(when AI ON (Air pump ON, all of air switching valves are ON)
2. Air pressure changeLess than 1 kPa (7.5 mmHg)
(when opening air switching valve No. 2 (Bank 2))
P2441: Electromagnetic air switching valve is stuck closed or air switching valve No. 2 (Bank 1 and
Bank 2) are stuck closed
Cumulative pressure pulsationLess than 15 kPa (113 mmHg)
(when AI ON (Air pump ON, all of air switching valves are ON)
MONITOR RESULT
Refer to page DI±26 for detailed information.
The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (refer to ºConfirmation Monitorº).
MID (Monitor Identification Data) is assigned to each emissions±related component.
TID (Test Identification Data) is assigned to each test value.
Scaling is used to calculate the test value indicated on generic OBD ll scan tools.
Secondary air injection (AIR) system
MIDTIDScalingDescription of Test ValueMinimum Test LimitMaximum Test Limit
$71$E1Multiply by 0.01
(g/s)Test value of AIR amount insufficientMinimum test limitMaximum test limit
$71$E2Multiply by 0.01
(kPa)Test value of AIR pump stuck ONMinimum test limitMaximum test limit
$71$E3Multiply by 0.01
(kPa)Test value of AIR pump stuck OFFMinimum test limitMaximum test limit
$71$E4Multiply by 0.01
(kPa)Test value of AIR control valve ONMinimum test limitMaximum test limit
$71$E5Multiply by 0.01
(kPa)Test value of AIR control valve OFFMinimum test limitMaximum test limit
$71$E6Multiply by 0.01
(kPa)Test value of AIR pressure change for
AIR valveMinimum test limitMaximum test limit
$71$E7Multiply by 0.01
(kPa)Test value of AIR pressure change for
AIR VSV bank 1Minimum test limitMaximum test limit
$71$E8Multiply by 0.01
(kPa)Test value of AIR pressure change for
AIR VSV bank 2Minimum test limitMaximum test limit
$71$E9Multiply by 0.01
(kPa)Test value of AIR pressure pulsation for
AIR VSV when AIR pressure is lowMinimum test limitMaximum test limit

Page 535 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17426
± DIAGNOSTICSENGINE
DI±333
527 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Refer to DTC P1441, P1444 and P2440 on page DI±314.
INSPECTION PROCEDURE
1 Check any other DTCs output

Page 536 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B17440
A46
Air Switching Valve Connector Wire Harness Side:
DI±334
± DIAGNOSTICSENGINE
528 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check voltage between terminal 1 of air switching valve and body

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