Toyota Sequoia (2005). Manual - part 159

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

–

DIAGNOSTICS

ENGINE

DI–431

625

2

Check air injection system pressure.

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.

(e)

Start the engine.

CHECK:
(a)

Select the following menu items: DIAGNOSIS/EN-
HANCED OBD II/SYSTEM CHECK/ AIR INJ CHECK/
MANUAL OPERATION/OPERATION 1 and 2

HINT:
OPERATION 1: AP:OFF, EASV:CLOSE, ASV1:CLOSE,
ASV2:CLOSE
OPERATION 2: AP:ON, EASV:OPEN, ASV1:OPEN,
ASV2:OPEN
(b)

Check that the PRESSURE on the hand–held tester.

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:

Tester operation

PRESSURE

Operation 1

Less then 2.5 kPa

Operation 2

5 to 8 kPa or more

NG

Go to step 4.

OK

B17435

Vacuum Hose

DI–432

–

DIAGNOSTICS

ENGINE

626

3

Check whether DTC output recurs.

PREPARATION:
(a)

Start the engine and warm it up.

(b)

Turn the ignition switch OFF.

(c)

Connect a hand–held tester to the DLC3.

(d)

Turn the ignition switch to ON and turn the tester ON.

(e)

Clear the DTCs (see page 

DI–43

).

(f)

Start the engine.

CHECK:
(a)

Perform SYSTEM CHECK to operate the air injection system.
Select the following menu items: DIAGNOSIS/ENHANCED OBD II/SYSTEM CHECK/AIR INJ
CHECK/AUTOMATIC OPERATION

(b)

After operating the secondary air injection system, confirm the pending codes for the secondary air
injection system by selecting the following  menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO
/ PENDING CODES.

(c)

Read DTCs and check that no DTC is set.

OK:

DTC P2444 or P2445 for the secondary air injection system is not output.

NG

 Go to step 4.

OK

Check for intermittent problems 
(See page 

DI–11

).

4

Check vacuum hose.

CHECK:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Check the vacuum hose connection between the pres-
sure sensor and air switching valve.

OK:

The vacuum hose is securely connected.

CHECK:
(a)

Check the vacuum hose for blockage or damage.

OK:

The vacuum hose has no blockage or damage.

NG

Repair or replace vacuum hose.

OK

B17434

Pressure Gauge

Pressure Sensor

B17436

–

DIAGNOSTICS

ENGINE

DI–433

627

5

Inspect ECM (air voltage).

PREPARATION:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Connect the pressure gauge to the pressure sensor as
shown in the illustration.

(c)

Connect the hand–held tester to the DLC3 on the vehicle.

(d)

Turn the ignition switch ON and  push the hand–held tes-
ter main switch ON (Do not start engine).

(e)

Select the following items: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / AIR PUMP PRS.

CHECK:
Check that the pressure displayed on the hand–held tester fluc-
tuates when applying the pressure to the pressure sensor with
the pressure gauge.
OK:

Pressure fluctuates in response to the pressure ap-
plied with the pressure gauge.

NG

Replace pressure sensor.

OK

6

Check connection of all air injection system piping and hoses.

CHECK:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Check that all the pipes and hoses between the air pump
and air switching valve are securely connected.

OK:

All the air injection pipes and hoses are securely con-
nected.

CHECK:
(a)

Check the pipe and hoses for blockage or damage.

OK:

The air injection system pipes and hoses have no
blockage and damage.

NG

Repair or replace air injection system piping.

OK

B17444

Wire Harness Side:

Air Injection Driver Connector

A41

+B

E

B17443

Wire Harness Side:

Air Injection Driver Connector

A40

BATT

DI–434

–

DIAGNOSTICS

ENGINE

628

7

Inspect air injection driver power source circuit.

PREPARATION:
(a)

Remove the intake manifold (see page 

EM–36

).

(b)

Disconnect the A40 and A41 air injection driver connec-
tors.

(c)

Turn the ignition switch to ON.

CHECK:
Measure the voltage between terminals A41–5 (+B) and A40–1
(BATT) of the air injection driver and body ground.
OK:

Standard:

Tester Connection

Specified Condition

A41–5 (+B) – Body ground

10 V or more

A40–1 (BATT) – Body ground

10 V or more

CHECK:
Measure the resistance between terminal A41–1 (E) of the air
injection driver and body ground.
OK:

Standard:

Tester Connection

Specified Condition

A41–1 (E) – Body ground

Below 1 

Ω

NG

Repair or replace harness or connector.

OK