Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 101

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–359

ES

•

The 2nd monitor
The vent valve is turned OFF (open) and the EVAP pressure is measured. If the variation in the
pressure is less than 0.5 kPa-g (3.75 mmHg-g), the ECM interprets this as the purge VSV being
stuck closed, and illuminates the MIL and sets DTC P0441 (2 trip detection logic).

Atmospheric pressure check:
In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before
and after conduction of the purge flow monitor, is measured by the ECM.

Components

Operations

Canister

Contains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank.

Cut-off valve

Located in fuel tank. Valve floats and closes when fuel tank 100 % full.

Purge VSV (Vacuum
Switching Valve)

Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In
order to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge
volume to intake manifold controlled by purge VSV duty cycle ratio (current-carrying time). (Open: ON, Closed:
OFF)

Refueling valve

Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and restrictor (diameter:
0.08 inch). When fuel vapor and pressure inside fuel tank increase, valve opens. While EVAP purged, valve
closes and restrictor prevents large amount of vacuum from affecting pressure in fuel tank. Valve opened while
refueling.

Roll-over valve

Located in fuel tank. Valve closes by its own weight when vehicle overturns to prevent fuel from spilling out.

Soak timer

Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+-15 minutes) after ignition switch turned
OFF. This allows fuel to cool down, stabilizing EVAP pressure. When approximately 5 hours elapsed, ECM
activates (refer to fig. 3).

Canister pump module

Consists of (a) to (d) below. Canister pump module cannot be disassembled.

(a) Vent valve

Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When, ECM turns valve OFF,
EVAP system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing
purge VSV, turning on vent valve (closed) and operating leak detection pump (refer to fig. 1).

(b) Canister pressure
sensor

Indicates pressure as voltages. ECM supplies regulated 5 V to canister pressure sensor, and uses feedback from
sensor to monitor EVAP system pressure (refer to fig. 2).

EVAP Purge Flow:

Fuel Cap

Canister Pressure Sensor

Reference Orifice (0.02 inch)

Refueling Valve

To Atmosphere

Vent Valve (OFF)

Canister Pump Module

Canister Filter

Fuel Tank

Soak Timer

To Intake Manifold

ECM

Leak Detection Pump (OFF)

Purge VSV
(ON)

Canister

A122571E02

ES–360

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

(c) Leak detection pump

Creates negative pressure (vacuum) in EVAP system for leak check.

(d) Reference orifice

Has opening with 0.02 inch diameter. Vacuum produced through orifice by closing purge VSV, turning off vent
valve and operating leak detection pump, to monitor reference pressure. Reference pressure indicates small leak
of EVAP.

Components

Operations

Canister Pump Module (fig. 1):

Canister

Canister Pressure
Sensor

Reference Orifice
(0.02 Inch)

: Airflow

Condition: Leak Check

From Refueling
Valve

Leak Detection
Pump: OFF

To Canister
Filter
(Atmosphere)

Leak Detection
Pump: ON

Condition: Purge Flow

Vent Valve: ON
(closed)

Vent Valve: OFF
(vent)

A115902E02

Canister Pressure Sensor Specification (fig. 2):

Pressure

Output Voltage

4.900 V

4.150 V

1.425 V

0.450 V

Malfunction Area

Malfunction Area

Usable Range

Standard atmospheric pressure is 101.3 kPa-a (760 mmHg-a)

HINT:

60

(450)

110

(825)

kPa-a

(mmHg-a)

A115543E06

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–361

ES

IGN

EFI

EFI

Ignition Switch

AM2

IGSW

+B

MREL

ECM

Power Source IC

Main Relay Control IC

Soak Timer IC

Battery

Soak Timer Circuit:

A133428E01

ES–362

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
An intelligent tester is required to conduct the following diagnostic troubleshooting procedure.
HINT:
•

Using an intelligent tester monitor results enables the EVAP (Evaporative Emission) system to be
confirmed.

M

9

8

2

3

4

1

Battery

EFI

EFI No. 2

EFI

B22
Purge VSV

VGND

VLVB

Vent Valve

SGND

VOUT

VCC

MGND

MTRB

Canister
Pressure
Sensor

Leak Detection Pump

L10
Canister Pump Module

ECM

MPMP

MREL

PRG

VPMP

E2

PPMP

VC

5 V

6

2

1

1

2

1

2

3

5

2

1

E47

8

B1

34

E47

5

B1

28

B1

23

E47

22

E47

6

A133429E01