2001 TOYOTA SEQUOIA engine

DI±308
± DIAGNOSTICSENGINE
502 Author: Date:
2005 SEQUOIA (RM1146U)
5 Inspect signal plate tooth of LH camshaft timing pulley.
NG Replace LH camshaft timing pulley.
OK
Replace camshaft position sensor.

± DIAGNOSTICSENGINE
DI±309
503 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1440 Secondary Air Injection System Control
Valve Circuit Bank 1
DTC P1443 Secondary Air Injection System Control
Valve Circuit Bank 2
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI±234.
DTC No.DTC Detection ConditionTrouble Area
P1440
AIV1 terminal voltage becomes less than half of the +B voltage
while the VSV for air injection control is not operating.
(1 trip detection logic)
Open or short in VSV for air injection control circuit (Bank 1)

VSV power source

VSV for air injection control (Bank 1)

ECM
P1443
AIV2 terminal voltage becomes less than half of the +B voltage
while the VSV for air injection control is not operating.
(1 trip detection logic)
Open or short in VSV for air injection control circuit (Bank 2)

VSV power source

VSV for air injection control (Bank 2)

ECM
MONITOR DESCRIPTION
The ECM detects an open or short in the circuit of the VSV for air injection control according to the AIV1
(AIV2) terminal voltage, stores the DTC, and then illuminates the MIL. When the AIV1 (AIV2) terminal voltage
is less than half of the +B voltage while the VSV for air injection control is not operating, the ECM determines
it as a malfunction.
MONITOR STRATEGY
RltdDTC
P1440Secondary air injection system control valve cir-
cuit (Bank 1) range check
Related DTCs
P1443Secondary air injection system control valve cir-
cuit (Bank 2) range check
Required sensors/componentsVSV for air injection control
Frequency of operationContinuous
Duration0.5 sec.
MIL operationImmediate
Sequence of operationNone
DIDMQ±01

DI±310
± DIAGNOSTICSENGINE
504 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
P1440:
EngineRunning
Air switching valve No. 2 (Bank 1)Not operating
P1443:
EngineRunning
Air switching valve No. 2 (Bank 2)Not operating
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P1440:
Air switching valve No. 2 (Bank 1) output terminal levelLow
P1443:
Air switching valve No. 2 (Bank 2) output terminal levelLow

A23564
Engine Room J/B
EFI Relay
2
1EFI No.2
EFI No.1
3
5 2A2
J5
J/C A
EDW±B1
2F
Battery BF10
FL Block
4
5B
2D1
2H6E4 B±W
IA4
B±W8
MREL
14P±L L±B
E8 E8
2726
AIV2 AIV1 V14
VSV for Air Injection Control
(Bank 1)
V12
VSV for Air Injection Control
(Bank 2)
G±R G±R
G±R
G±R
IG422 J/C J16
BB G±R
IA44
G±R
AA J/C J2
G±RECM
± DIAGNOSTICSENGINE
DI±311
505 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

B17440
V14
V15
Wire Harness Side:
VSV for Air Injection
Control Connector
B17412
E8
AIV1
AIV2
B17440
V14
V15
Wire Harness Side:
VSV for Air Injection
Control Connector
DI±312
± DIAGNOSTICSENGINE
506 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check VSV for air injection control power source.
PREPARATION:
(a) Disconnect the VSV for air injection control connector.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between the terminal 1 of the VSV con-
nector and body ground.
OK:
Standard: 9 V or more
NG Check and replace harness and connector.
OK
2 Check for open and short circuit in harness and connector between ECM and
VSV for air injection control
PREPARATION:
(a) Disconnect the E8 ECM connector.
(b) Disconnect the VSV for air injection control connector.
CHECK:
Measure the resistance between the VSV connector and ECM.
OK:
Standard:
Tester connectionSpecified condition
E8±27 (AIV1) ± V14±2Below 1 W
E8±26 (AIV2) ± V15±2Below 1 W
CHECK:
Measure the resistance between the VSV connector and body
ground.
OK:
Standard:
Tester connectionSpecified condition
E8±27 (AIV1) or V14±2 and Body
ground10 KW or higher
E8±26 (AIV1) or V15±2 and Body
ground10 KW or higher
NG Repair or replace harness or connector.
OK

B17515
± DIAGNOSTICSENGINE
DI±313
507 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check resistance of VSV for air injection control.
PREPARATION:
(a) Disconnect the connector from the VSV.
(b) Disconnect the 2 vacuum hoses from the VSV.
CHECK:
Measure the resistance between the VSV terminals.
OK:
Standard:
Tester ConnectionSpecified Condition
1 ± 233 to 39 W at 20°C (68°F)
1 ± Body ground10 kW or higher
2 ± Body ground10 kW or higher
NG Replace VSV for air injection control.
OK
Replace ECM. (See page SF±80)

DI±314
± DIAGNOSTICSENGINE
508 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P1441 Secondary Air Injection System Switching
Valve No.2 Stuck Open Bank 1
DTC P1444 Secondary Air Injection System Switching
Valve No.2 Stuck Open Bank 2
DTC P2440 Secondary Air Injection System Switching
Valve Stuck Open Bank 1
CIRCUIT DESCRIPTION
Refer to DTC P0412 on page DI±234.
DTC No.DTC Detection ConditionTrouble Area
P1441
Air switching valve No.2 (bank 1) stuck open:
The pressure sensor detects exhaust pulsation, when both of
air switching valve No.2 are OFF (and air switching valve ON).
(2 trip detection logic)
VSV for air injection control circuit (Bank 1)

Air switching valve No.2 (Bank 1)

VSV for air injection system (Bank 1)

ECM
P1444
Air switching valve No.2 (bank 2) stuck open:
The pressure sensor detects exhaust pulsation, when both of
air switching valve No.2 are OFF (and air switching valve ON).
(2 trip detection logic)
VSV for air injection control circuit (Bank 2)

Air switching valve No.2 (Bank 2)

VSV for air injection system (Bank 2)

ECM
P2440
Air switching valve stuck open:
The pressure sensor detects exhaust pulsation when the sys-
tem does not operate (both of air switching valve No.2 OFF,
and air switching valve OFF and air pump OFF).
This DTC means open stuck of air switching valve and ºair
switching valve No.2 (bank 1 or bank 2)º
(1 trip detection logic)
Air switching valve

Air switching valve No.2 (Bank 1 and/or 2)

VSV for air injection system (Bank 1 and/or 2)

Air injection driver

Air injection driver circuit

ECM
DIDMR±01

B17424
Monitor Operation Outline
Running
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF Engine
Air pump
ASV
(Electromagnetic Type)
ASV No.2 (Bank 1)
(Vacuum Type)*
System Air Pressure ASV No.2 (Bank 2)
(Vacuum Type)*
AB C D E F
*: ASV No.2 opens alternately per a trip.
± DIAGNOSTICSENGINE
DI±315
509 Author: Date:
2005 SEQUOIA (RM1146U)
MONITOR DESCRIPTION
The ECM detects pressure change with the pressure sensor to determine malfunctioning parts in the system,
and stores the DTCs. The ECM measures pressure and/or exhaust pulsation of the system at 6 points, A
to F, when the air injection system is in operation or when not in operation. When the pressure is high, the
ECM determines the that pump operates. When exhaust pulsation is detected, the ECM determines that the
ASV is open. The ECM determines malfunction parts based on the measured value, and stores the DTCs.
Points A and B:
ECM detects pressure changes (decrease), and determines that the ASV No.2 is open.
Points C and F:
ECM detects pressure and exhaust pulsation, and determines the pressure pattern of the system.
Point D:
ECM operates the system, as indicated by the dashed lines, to determine which of the ASV No.2 is malfunc-
tioning only when pressure changes cannot be detected at point A or B.
Point E:
ECM detects exhaust pulsation to determine the condition of the system.
Pressure condition in Secondary Air Injection System (Point C and F)
Pattern 1:
Air PumpON
Air Switching Valve and Air Switching Valve No.2Open
Pressure1 kPa or more
Pulsation detectionExhaust gas pulsation detected