Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 96

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–339

ES

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

).

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–340

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

DTC SUMMARY

HINT:
The vent valve is built into the canister pump module.

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

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

P2419

Evaporative Emission System Switching Valve
Control Circuit Low

DTC

P2420

Evaporative Emission System Switching Valve
Control Circuit High

DTCs

Monitoring Items

Malfunction Detection Conditions

Trouble Areas

Detection

Timings

Detection

Logic

P2419

Vent valve stuck closed

P043E, P043F, P2401, P2402 and
P2419 present when one of following
conditions met during key-off EVAP
monitor:
•

EVAP pressure just after reference
pressure measurement greater than
-1 kPa-g (-7.5 mmHg-g)

•

Reference pressure less than -4.85
kPa-g (-36.4 mmHg-g)

•

Reference pressure greater than -
1.057 kPa-g (-7.93 mmHg-g)

•

Reference pressure not saturated

•

Reference pressure difference
between first and second 0.7 kPa-g
(5.25 mmHg-g) or more

HINT:
Typical example values

•

Canister pump module
(Reference orifice, leak
detection pump, vent
valve)

•

Connector/wire harness
(Canister pump module -
ECM)

•

EVAP system hose (pipe
from air inlet port to
canister pump module,
canister filter, fuel tank
vent hose)

•

ECM

While ignition
switch OFF

2 trip

P2420

Vent valve stuck open
(vent)

Following condition met during key-off
EVAP monitor:
•

EVAP pressure change when vent
valve closed (ON) less than 0.3 kPa-
g (2.25 mmHg-g)

•

Canister pump module
(Reference orifice, leak
detection pump, vent
valve)

•

Connector/wire harness
(Canister pump module -
ECM)

•

ECM

While ignition
switch OFF

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–341

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–342

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

1. P2419: Vent valve stuck closed

In operation B, the leak detection pump creates negative pressure (a vacuum) through the reference
orifice. The EVAP system pressure is then measured by the ECM, using the canister pressure sensor,
to determine the reference pressure. If the pressure exceeds -1.057 kPa-g (-7.93 mmHg-g) 4 seconds
after the leak detection pump is turned ON, the ECM interprets this as the vent valve being stuck
closed.
The ECM illuminates the MIL and sets the DTC (2 trip detection logic).

EVAP Pressure when Vent Valve Stuck ON:

Purge VSV

Vent Valve

Leak Detection
Pump

EVAP Pressure

Positive

Negative

First Reference
Pressure

Time

10 seconds

60
seconds

10
seconds

60
seconds

4 seconds

Malfunction

OK

ON

ON

ON

ON: Open

OFF: Closed

ON: Closed

OFF: Vent

Sequence

A

B

C

D

E

Within 15 minutes

A106066E04