Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 68

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–227

ES

1.

Key-off monitor sequence 1 to 8

1. Atmospheric pressure measurement

2. First reference pressure measurement

3. Vent valve stuck closed check

4. Vacuum introduction

5. Purge VSV stuck closed check

6. Second reference pressure measurement

7. Leak check

8. Atmospheric pressure measurement

TYPICAL MALFUNCTION THRESHOLDS

"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa-g (2.14 mmHg-g) in 60
seconds.

MONITOR RESULT

Refer to CHECKING MONITOR STATUS (See page

ES-20

).

ECT

4.4

° to 35°C (40° to 95°F)

IAT

4.4

°to 35°C (40° to 95°F)

Next sequence run if following condition set

-

Atmospheric pressure change

Less than 0.3 kPa-g (2.25 mmHg-g) in 1 second

Next sequence run if all of following conditions set

Condition 1, 2 and 3

1. EVAP pressure just after reference pressure measurement start

-1 kPa-g (-7.5 mmHg-g) or less

2. Reference pressure

-4.85 to -1.057 kPa-g (-36.4 to -7.93 mmHg-g)

3. Reference pressure

Saturated within 60 seconds

Next sequence run if following condition set

-

EVAP pressure change after vent valve ON (closed)

0.3 kPa-g (2.25 mmHg-g) or more

Next sequence run if following condition set

-

EVAP pressure

Saturated within 15 minutes

Next sequence run if following condition set

-

EVAP pressure change after purge VSV ON (open)

0.3 kPa-g (2.25 mmHg-g) or more

Next sequence run if all of following conditions set

Condition 1, 2, 3 and 4

1. EVAP pressure just after reference pressure

-1 kPa-g (-7.5 mmHg-g) or less

2. Reference pressure

-4.85 to -1.057 kPa-g (-36.4 to -7.93 mmHg-g)

3. Reference pressure

Saturated within 60 seconds

4. Reference pressure difference between first and second

Less than 0.7 kPa-g (5.25 mmHg-g)

Next sequence run if following condition set

-

EVAP pressure when vacuum introduction complete

Second reference pressure or less

EVAP monitor complete if following condition set

-

Atmospheric pressure difference between sequence 1 and 8

Within 0.3 kPa-g (2.25 mmHg-g)

One of following conditions met

-

EVAP pressure just after reference pressure measurement start

More than -1 kPa-g (-7.5 mmHg-g)

Reference pressure

Less than -4.85 kPa-g (-36.4 mmHg-g)

Reference pressure

-1.057 kPa-g (-7.93 mmHg-g) or more

Reference pressure

Not saturated within 60 seconds

Reference pressure difference between first and second

0.7 kPa-g (5.25 mmHg-g) or more

ES–228

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

DTC SUMMARY

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System (See page

ES-352

).

INSPECTION PROCEDURE

Refer to the EVAP System (See page

ES-357

).

MONITOR DESCRIPTION

The two monitors, Key-Off and Purge Flow, are used to detect malfunctions relating to DTC P0441. The

Key-Off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours

*

after the ignition

switch is turned to OFF. The purge flow monitor runs while the engine is running.
1. KEY-OFF MONITOR

5 hours

*

after the ignition switch is turned to OFF, the leak detection pump creates negative pressure

(vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the
EVAP pressure.
HINT:

*

: If the engine coolant temperature is not below 35

°C (95°F) 5 hours after the ignition switch is turned

to OFF, the monitor check starts 2 hours later. If it is still not below 35

°C (95°F) 7 hours after the ignition

switch is turned to OFF, the monitor check starts 2.5 hours later.

DTC

P0441

Evaporative Emission Control System Incorrect
Purge Flow

DTC

Monitoring Items

Malfunction Detection Conditions

Trouble Areas

Detection

Timings

Detection

Logic

P0441

Purge VSV (Vacuum
Switching Valve) stuck
open

Leak detection pump creates negative
pressure (vacuum) in EVAP system and
EVAP system pressure measured.
Reference pressure measured at start
and at end of leak check.
If stabilized pressure higher than [second
reference pressure x 0.2], ECM
determines that purge VSV stuck open

•

Purge VSV

•

Connector/wire harness
(Purge VSV - ECM)

•

ECM

•

Canister pump module

•

Leakage from EVAP
system

While ignition
switch OFF

2 trip

Purge VSV stuck closed

After EVAP leak check performed, purge
VSV turned ON (open), and atmospheric
air introduced into EVAP system.
Reference pressure measured at start
and at end of check.
If pressure does not return to near
atmospheric pressure, ECM determines
that purge VSV stuck closed

•

Purge VSV

•

Connector/wire harness
(Purge VSV - ECM)

•

ECM

•

Canister pump module

•

Leakage from EVAP
system

While ignition
switch OFF

2 trip

Purge flow

While engine running, following
conditions successively met:
•

Negative pressure not created in
EVAP system when purge VSV
turned ON (open)

•

EVAP system pressure change less
than 0.5 kPa-g (3.75 mmHg-g) when
vent valve turned ON (closed)

•

Atmospheric pressure change before
and after purge flow monitor less
than 0.1 kPa-g (0.75 mmHg-g)

•

Purge VSV

•

Connector/wire harness
(Purge VSV - ECM)

•

Leakage from EVAP line
(Purge VSV - Intake
manifold)

•

ECM

While engine
running

2 trip

Sequ

ence

Operations

Descriptions

Duration

-

ECM activation

Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF.

-

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–229

ES

*

If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

A

Atmospheric pressure
measurement

Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to
register atmospheric pressure.
If pressure in EVAP system not between 70 kPa-a and 110 kPa-a (525 mmHg-a and 825
mmHg-a), ECM cancels EVAP system monitor.

10 seconds

B

First reference
pressure measurement

In order to determine reference pressure, leak detection pump creates negative pressure
(vacuum) through reference orifice and then ECM checks if leak detection pump and vent
valve operate normally.

60 seconds

C

EVAP system pressure
measurement

Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
measured.
Write down measured value as will be used in leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.

15 minutes

*

D

Purge VSV monitor

Purge VSV opened and then EVAP system pressure measured by ECM.
Large increase indicates normality.

10 seconds

E

Second reference
pressure measurement

After second reference pressure measurement, leak check performed by comparing first and
second reference pressure.
If stabilized system pressure higher than second reference pressure, ECM determines that
EVAP system leaking.

60 seconds

F

Final check

Atmospheric pressure measured and then monitoring result recorded by ECM.

-

Sequ

ence

Operations

Descriptions

Duration

Operation A: Atmospheric Pressure Measurement

Operation C: EVAP System Pressure Measurement

Operation B, E:

Reference Pressure Measurement

Operation D: Purge VSV Monitor

Purge VSV: OFF

Canister

Fuel Tank

Vent Valve: OFF (vent)

Canister Pump Module

Canister Filter

Canister
Pressure
Sensor

Leak Detection Pump: OFF

OFF

ON

ON (closed)

Atmospheric
Pressure

Negative
Pressure

OFF

OFF (vent)

ON

Reference Orifice (0.02 Inch)

ON

ON

ON (closed)

A112612E01

ES–230

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

(a)Purge VSV stuck open

In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system.
The EVAP system pressure is then measured by the ECM using the canister pressure sensor. If the
stabilized system pressure is higher than [second reference pressure x 0.2], the ECM interprets this
as the purge VSV (Vacuum Switching Valve) being stuck open. The ECM illuminates the MIL and
sets the DTC (2 trip detection logic).

EVAP Pressure when Purge Stuck Open:

Purge VSV

Vent Valve

Leak Detection
Pump

10 seconds

60
seconds

60
seconds

10
seconds

Malfunction

ON: Open

OFF: Closed
ON: Closed

OFF: Vent

EVAP Pressure

Positive

Negative

First Reference
Pressure

Sequence

Time

OK

ON

ON

ON

D

E

C

B

A

[Second
Reference
Pressure] x 0.2

Within 15 minutes

A108008E06