Page 537 of 4323

B17436
A23671
Port APort B
Air
A23672
Port APort B
Battery Air
± DIAGNOSTICSENGINE
DI±335
529 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check all air injection pipes and hoses of air injection system.
CHECK:
(a) Remove the intake manifold (see page EM±36).
(b) Check all pipes and hoses of the air injection system.
OK:
All the air injection pipes and hoses are securely con-
nected.
CHECK:
(a) Check all pipes and hoses of the air injection system for
blockage or damage.
OK:
The air injection system pipes and hoses have no
blockage or damage.
NG Repair or replace pipe or hose.
OK
5 Check air switching valve operation.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Remove the air switching valve.
CHECK:
Blow air into port A and check that air is not discharged from port
B.
OK:
Not discharged
CHECK:
(a) Apply battery positive across the terminals.
(b) 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
Page 538 of 4323

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
DI±336
± DIAGNOSTICSENGINE
530 Author: Date:
2005 SEQUOIA (RM1146U)
6 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) Turn the ignition switch to ON 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 open.
NEXT
Page 539 of 4323

A23560
Port A
± DIAGNOSTICSENGINE
DI±337
531 Author: Date:
2005 SEQUOIA (RM1146U)
7 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) Turn the ignition switch to ON and turn the tester ON.
CHECK:
(a) When the air switching valve is operated using the hand±
held tester, check that negative pressure from the port A.
(b) Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/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 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:
Negative pressure from port A
NG Go to step 10.
OK
Page 540 of 4323
A23452
B17530
Port C
Port B Port A
Air
B17531
Port C
Port BPort A
Air
DI±338
± DIAGNOSTICSENGINE
532 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check vacuum hose between air switching valve(s) No.2 and VSV for air injec-
tion control.
CHECK:
(a) Check that the vacuum hoses between the air switching
valve(s) No.2 and VSV for air injection control are secure-
ly connected.
OK:
The vacuum hose(s) are securely connected.
CHECK:
(a) Check the vacuum hoses for blockages and damage.
OK:
The vacuum hoses no blockages and damages.
NG Repair or replace vacuum hose.
OK
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 the
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 the port C.
OK:
Discharged from port C
NG Replace air switching valve No.2.
OK
Page 541 of 4323
A23451
B17516
AirA
B17517
AirA
± DIAGNOSTICSENGINE
DI±339
533 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check air injection pipe between air switching valve No.2 and exhaust manifold.
CHECK:
(a) Check that the air injection pipe between the air switching
valve(s) No.2 and exhaust manifold is securely con-
nected.
OK:
The air injection pipe is securely connected.
CHECK:
(a) Check the air injection pipe for blockages and damage.
OK:
The air injection pipe have no blockages and damage.
NG Repair or replace air injection pipe.
OK
Check for intermittent problems
(See page DI±11).
11 Check VSV for air injection control.
PREPARATION:
Disconnect the 2 vacuum hoses.
CHECK:
Check that air does not flow from the port A as shown in the il-
lustration.
OK:
Not flow from port A
CHECK:
Apply battery positive across the terminals, check that air flows
from the port A.
OK:
Flow from port A
NG Replace VSV for air injection control.
OK
Page 542 of 4323
B17412
E8
AIV1
AIV2
B17437
V14
VSV Connector V15
Wire Harness Side:
DI±340
± DIAGNOSTICSENGINE
534 Author: Date:
2005 SEQUOIA (RM1146U)
12 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
Page 543 of 4323

B17444
Wire Harness Side:
Air Injection Driver Connector
A41
VV
B17440
A46
Air Switching Valve Connector Wire Harness Side:
B17440
A46
Air Switching Valve Connector Wire Harness Side:
± DIAGNOSTICSENGINE
DI±341
535 Author: Date:
2005 SEQUOIA (RM1146U)
13 Check for open and short in harness and connector between air injection driver
and air switching valve.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A41 air injection driver connector.
(c) Disconnect the A46 air switching valve connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
VV (A41±6) ± A46±1Below 1 W
VV (A41±6) or A46±1 ±
Body ground10 kW or higher
NG Repair or replace harness or connector and go
to step 6.
OK
14 Check for open in harness and connector between air switching valve and body
ground.
PREPARATION:
(a) Remove the intake manifold (see page EM±36).
(b) Disconnect the A46 air switching valve connector.
CHECK:
Measure the resistance between the wire harness side connec-
tors and body ground.
OK:
Standard:
Tester ConnectionSpecified Condition
A46±2 ± Body groundBelow 1 W
NG Repair or replace harness or connector and go
to step 6.
OK
Page 544 of 4323
B17444
Wire Harness Side:
Air Injection Driver Connector
A41
SIV
B17417
E4
AIRV
DI±342
± DIAGNOSTICSENGINE
536 Author: Date:
2005 SEQUOIA (RM1146U)
15 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 and go
to step 6.
OK
Replace ECM (See page SF±80).