Toyota Sequoia (2005). Manual - part 174

–

DIAGNOSTICS

ENGINE

DI–491

685

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 ”Confirmation Monitor”).

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.

EVAP–Key–off monitor

MID

TID

Scaling

Description of Test Value

Minimum Test Limit

Maximum Test Limit

$3D

$C9

Multiply by 0.01

(kPa)

Test value for small leak (P0456):

Refer to pressure D*.

Minimum test limit for small

leak

Maximum test limit for small

leak

$3D

$CA

Multiply by 0.01

(kPa)

Test value for gross leak (P0455):

Refer to pressure E*.

Minimum test limit for gross

leak

Maximum test limit for gross

leak

$3D

$CB

Multiply by 0.01

(kPa)

Test value for vacuum pump stuck OFF

(P2401):

Refer to pressure A*.

Minimum test limit for vacuum

pump stuck OFF

Maximum test limit for vacuum

pump stuck OFF

$3D

$CD

Multiply by 0.01

(kPa)

Test value for vacuum pump stuck ON

(P2402):

Refer to pressure A*.

Minimum test limit for vacuum

pump stuck ON

Maximum test limit for vacuum

pump stuck ON

$3D

$CE

Multiply by 0.01

(kPa)

Test value for vent valve stuck OFF

(vent) (P2420):

Refer to pressure C*.

Minimum test limit for vent

valve stuck ON

Maximum test limit for vent

valve stuck ON

$3D

$CF

Multiply by 0.01

(kPa)

Test value for vent valve stuck ON

(closed) (P2419):

Refer to pressure A*.

Minimum test limit for vent

valve stuck OFF

Maximum test limit for vent

valve stuck OFF

$3D

$D0

Multiply by 0.01

(kPa)

Test value for 0.02 inch orifice low flow

(P043E):

Refer to pressure B*.

Minimum test limit for 0.02

inch orifice low flow

Maximum test limit for 0.02

inch orifice low flow

$3D

$D1

Multiply by 0.01

(kPa)

Test value for 0.02 inch orifice high flow

(P043F):

Refer to pressure A*.

Minimum test limit for 0.02

inch orifice high flow

Maximum test limit for 0.02

inch orifice high flow

$3D

$D4

Multiply by 0.01

(kPa)

Test value for purge VSV stuck close

(P0441):

Refer to pressure F*.

Minimum test limit for purge

VSV stuck close

Maximum test limit for purge

VSV stuck close

$3D

$D5

Multiply by 0.01

(kPa)

Test value for purge VSV stuck open

(P0441):

Refer to pressure E*.

Minimum test limit for purge

VSV stuck open

Maximum test limit for purge

VSV stuck open

$3D

$D7

Multiply by 0.01

(kPa)

Test value for purge flow (P0441):

Refer to pressure G*.

Minimum test limit for purge

flow

Maximum test limit for purge

flow

* Pressure A to G are indicated as shown in the diagram below.

A23517

Key–off Monitor

Purge VSV

Vent Valve

Atmosphere (0 kPa)

Criterion 1 (–1.2 kPa)

Criterion 5 (–4.3 kPa)

Elapsed Time (Seconds)

10

4

EVAP Pressure 
(Reference)

Pump

Monitor Start

ON (Open)

ON (Close)

ON

A

B

C

60

D

G

Within 720

Criterion 2 (Criterion 4 x 0.2)

Criterion 3 (0.3 kPa)

Criterion 4

E

F

Criterion 6 (0.3 kPa)

10

60

Purge Flow Monitor

Sequence

Purge VSV

Vent Valve

Criterion 7 (0.1 kPa)

EVAP Pressure
(Reference)

Criterion 8 (1kPa)

If pressure change in sequence 1 is
greater than criterion 7, purge flow moni-
tor is completed (functioning normally).

ON (Close)

1

2

ON (Open)

If pressure change in sequence 1 is
smaller than criterion 7, sequence 2 is
run.

If pressure change in sequence 2 is
smaller than criterion 8, purge flow is in-
sufficient.

DI–492

–

DIAGNOSTICS

ENGINE

686

–

DIAGNOSTICS

ENGINE

DI–493

687

ECM Power Source Circuit

CIRCUIT DESCRIPTION

When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and
the EFI relay control circuit in the ECM sends a signal to terminal MREL of the ECM switching on the EFI
relay.
This signal causes current to flow to the coil, closing the contacts of the EFI relay and supplying power to
terminal +B of the ECM.

DID8K–01

A23555

F10
Fusible
Link
Block

9

+B

Battery

E1

1

8

1

E4

E6

BR

4D

B–R

6

7

I18 Ignition SW

2

W–R

1C

1E

1C

2

1

3

B

IG2

IA4

B–W

ECM

Engine Room J/B

EFI Relay

1

D

IGSW

MREL

E4

E4

17

IGN1

4E

Instrument Panel J/B

Sub J/B No. 4

5

AM2

Instrument Panel J/B

1

1

6

AM2

1J

2D

2F

2C

2H

5

3

2

IA4

J/C

5

4

B

14

12

2

J16

A

EB

ED

D

J5
J/C

W–B

2H

2

B–R

B–W

B–R

B–R

EFI No. 1

W–R

B–O

B–O

DI–494

–

DIAGNOSTICS

ENGINE

688

WIRING DIAGRAM