Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 69

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–231

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(b)Purge VSV stuck closed

In operation D, the canister pressure sensor measures the EVAP system pressure. The pressure 
measurement for purge VSV monitor is begun when the purge VSV is turned ON (open) after the 
EVAP leak check. When the measured pressure indicates an increase of 0.3 kPa-g (2.25 mmHg-g) 
or more, the purge VSV is functioning normally. If the pressure does not increase, the ECM 
interprets this as the purge VSV being stuck closed. The ECM illuminates the MIL and sets the DTC 
(2 trip detection logic).

2. PURGE FLOW MONITOR

The purge flow monitor consists of the two step monitors. The 1st monitor is conducted every time and 
the 2nd monitor is activated if necessary.

EVAP Pressure when Purge VSV Stuck Closed:

Purge VSV

Vent Valve

Leak Detection 
Pump

EVAP Pressure

Positive

Negative

First Reference 
Pressure

Sequence

Time

10 seconds

60 
seconds

10 
seconds

60 
seconds

Malfunction

ON: Open

OFF: Closed

OFF: Vent

ON: Closed

OK

ON

ON

ON

A

B

C

D

E

Within 15 minutes

A106059E06

OK

OK

EVAP Pressure

Vent Valve

Purge VSV

EVAP Pressure During Purge Flow Monitor:

Open

0.1 kPa-g (0.75 mmHg-g)

0.5 kPa-g (3.75 mmHg-g)

Malfunction

1st Monitor 2nd Monitor

ON (Closed)

A112640E01

ES–232

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES

•

The 1st monitor
While the engine is running and the purge VSV is ON (open), the ECM monitors the purge flow by 
measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd 
monitor.

•

The 2nd monitor
The vent valve is turned ON (closed) and the EVAP pressure is then 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.

OBD II MONITOR SPECIFICATIONS

1.

Key-off Monitor

Monitor Strategy

Typical Enabling Conditions

2.

Key-off monitor sequence 1 to 8

1. Atmospheric pressure measurement

2. First reference pressure measurement

3. Vent valve stuck closed check

Required Sensors/Components

Purge VSV and canister pump module

Frequency of Operation

Once per driving cycle

Duration

Within 15 minutes (varies with fuel in tank)

MIL Operation

2 driving cycles

Sequence of Operation

None

EVAP key-off monitor runs when all of following conditions met

-

Atmospheric pressure

70 to 110 kPa-a (525 to 825 mmHg-a)

Battery voltage

10.5 V or more

Vehicle speed

Below 2.5 mph (4 km/h)

Ignition switch

OFF

Time after key off

5 or 7 or 9.5 hours

Canister pressure sensor malfunction (P0450, P0451, P0452 and 
P0453)

Not detected

Purge VSV

Not operated by scan tool

Vent valve

Not operated by scan tool

Leak detection pump

Not operated by scan tool

Both of following conditions met before key off

Conditions 1 and 2

1. Duration that vehicle driven

5 minutes or more

2. EVAP purge operation

Performed

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

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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4. Vacuum introduction

5. Purge VSV stuck closed check

6. Second reference pressure measurement

7. Leak check 

8. Atmospheric pressure measurement

Typical Malfunction Thresholds

OBD II MONITOR SPECIFICATIONS

1.

Purge Flow Monitor

Monitor Strategy

Typical Enabling Conditions

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)

Purge VSV stuck open:

-

EVAP pressure when vacuum introduction complete

Higher than reference pressure x 0.2

Purge VSV stuck closed:

-

EVAP pressure change after purge VSV ON (open)

Less than 0.3 kPa-g (2.25 mmHg-g)

Required Sensors/Components

Purge VSV and canister pump module

Frequency of Operation

Once per driving cycle

Duration

Within 10 minutes

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

P0011 (VVT System 1 - Advance)
P0012 (VVT System 1 - Retard)
P0021 (VVT System 2 - Advance)
P0022 (VVT System 2 - Retard)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for Closed Loop)
P0171, P0172, P0174, P0175 (Fuel system)
P0300 - P0306 (Misfire)
P0335 (CKP sensor)
P0340 (CMP sensor)
P0351 - P0356 (Igniter)
P0450 - P0453 (EVAP press sensor)
P0500 (VSS)

Engine

Running

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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Typical Malfunction Thresholds

MONITOR RESULT

Refer to CHECKING MONITOR STATUS (See page 

ES-20

).

ECT

4.4

°C (40°F) or more

IAT

4.4

°C (40°F) or more

Canister pressure sensor malfunction

Not detected

Purge VSV

Not operated by scan tool

EVAP system check

Not operated by scan tool

Battery voltage

10 V or more

Purge duty cycle

8 % or more

Both of following conditions met

Conditions 1 and 2

1. EVAP pressure change when purge operation started

Less than 0.1 kPa-g (0.75 mmHg-g)

2. EVAP pressure change during purge operation when vent valve 
closed

Less than 0.5 kPa-g (3.75 mmHg-g)