2001 TOYOTA SEQUOIA engine

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
SIV
B17417
E4
AIRV
DI±324
± DIAGNOSTICSENGINE
518 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check for open and short in harness and connector between air injection driver
and ECM.
PREPARATION:
(a) Disconnect the air injection driver connector.
(b) Disconnect the E4 ECM connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
SIV (A41±3) ± AIRV (E4±4)Below 1 W
SIV (A41±3) or AIRV (E4±4) ±
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF±80).

A16555
AIR INJ CHECK
AIR PUMP............................ON
EASV ............................OPEN
ASV1. .............................OPEN
ASV2...............................OPEN
A/F BANK1......................19.05
A/F BANK2........................14.5
PRESSURE....................17 kPa
PULSATION..............25.39 kPa
AI STATUS...........................OK
Remaining Time 05 sec.
Press [EXIT] to quit
± DIAGNOSTICSENGINE
DI±325
519 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check air switching valve No.2 operation.
PREPARATION:
(a) Start the engine and warm it up.
(b) Turn the ignition switch to OFF.
(c) Connect the hand±held tester to the DLC3.
(d) Start the engine and push the hand±held tester main
switch ON.
CHECK:
(a) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/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 hand±held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
(b) Read value of the A/F BANK1 and BANK2 on the hand±
held tester.
RESULT:
Air switching valve No.2 operationAir±fuel ratio
Open18 or more
CloseApproximately 14.5
HINT:

When the ASV No.2 operates normally, the A/F value is 18 or more when the valve is open, and approx-
imately 14.5 when the valve is closed.

Perform the following procedures only on the bank of which the valve is not close.
NEXT

A23646
Port A
DI±326
± DIAGNOSTICSENGINE
520 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check VSV for air injection control operation.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the vacuum hose from the VSV for air injec-
tion control.
(c) Connect the hand±held tester to the DLC3.
(d) Start the engine and turn the tester ON.
CHECK:
(a) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1
(b) At this time, check that no negative pressure generates
at port A of the VSV.
HINT:
OPERATION 1: AP: OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
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 hand±held tester
is prohibited, the tester displays the prohibition (WAIT or
ERROR). If the ERROR (AI STATUS NG) is displayed on the
tester, stop the engine for 10 minutes and then try again..
OK:
No negative pressure is generated.
NG Go to step 10.
OK

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 the air switching valve No.2.
CHECK:
Blow air into port B and check that air is not discharged from port
C.
OK:
Not discharged from port C
CHECK:
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 air switching valve No.2.
OK
Check for intermittent problems
(See page DI±11).

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 VSV for air injection control.
CHECK:
Check that air does not flow from the port as shown in the il-
lustration.
OK:
Does not flow from port A
CHECK:
Apply battery positive across the terminals, check that air flows
from the ports.
OK:
Flows from port A
NG Replace VSV for air injection control.
OK

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 connector between ECM and
VSV for air injection system control
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the E8 ECM connector.
(c) Disconnect the VSV for air injection system control con-
nector.
CHECK:
Measure the resistance between the VSV connector and ECM.
OK:
Standard:
Tester connectionSpecified condition
E8±27 (AIV1) ± V14±2Below 1 W
E8±26 (AIV1) ± 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
Replace ECM (See page SF±80).

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

± 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) is stuck closedRelated DTCs
P2441Air switching valve and air switching valve No.2
are stuck closed
Required sensors/componentsPressure sensor, Air switching valve No. 2 (Bank 1, 2), Electromagnetic air switching valve
Frequency of operationContinuous
Duration
P1442 (Air switching valve No. 2 (Bank 1) is stuck closed): 20 sec.
P1445 (Air switching valve No. 2 (Bank 2) is stuck closed): 20 sec.
P2441 (Air switching valve is stuck closed): 8 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
P1442, P1445: Air switching valve No. 2 bank 1 and/or bank 2 are stuck closed
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Atmospheric pressure76 kPa (570 mmHg)±
Battery voltage11.5 V±
IdleON
Engine RPM±3,750 rpm
Time after secondary air injection out of
operation10 sec.±
Air injection pressure sensor failNot detected
P2441: Electromagnetic air switching valve is stuck closed or air switching valve No. 2 (Bank 1 and
Bank 2) are stuck closed
ItSpecificationItemMinimumMaximum
The monitor will run whenever this DTC is
not presentSee page DI±18
Atmospheric pressure76 kPa (570 mmHg)±
Battery voltage11.5 V±
Time after secondary air injection in op-
eration6 sec.±
AIR pumpON
Air switching valveON
Air switching valve No. 2 (Bank 1)ON
Air switching valve No. 2 (Bank 2)ON
Engine RPM±3,750 rpm
Delay time after engine started6 sec.±
Air injection pressure sensor failNot detected