Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 97

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–343

2. P2420: Vent valve stuck open (vent)

In operation C, the vent valve turns ON (closes) and the EVAP system pressure is then measured by
the ECM, using the canister pressure sensor, to conduct an EVAP leak check. If the pressure does not
increase when the vent valve is open, the ECM interprets this as the vent valve being stuck open. The
ECM illuminates the MIL and sets the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Required Sensors/Components

Purge VSV and canister pump module

Frequency of Operation

Once per driving cycle

Duration

Within 15 minutes (varies with amount of fuel in tank)

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

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

EVAP Pressure when Vent Valve Stuck OFF:

Purge VSV

Vent Valve

Leak Detection
Pump

EVAP Pressure

Positive

Negative

First Reference
Pressure

Sequence

Time

10 seconds

60
seconds

10
seconds

Malfunction

OFF: Vent

OFF: Closed

ON: Open

ON: Closed

Within 15 minutes

A106067E04

ES–344

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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.
P2419: Vent valve stuck closed

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

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 set

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

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–345

P2420: Vent valve stuck open (vent)

MONITOR RESULT

Refer to CHECKING MONITOR STATUS (See page

ES-20

Reference pressure difference between first and second

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

EVAP pressure change after EVAP canister vent valve ON

Less than 0.3 kPa-g (2.25 mmHg-g)

ES–346

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

DTC SUMMARY

DESCRIPTION

To ensure the accuracy of the EVAP (Evaporative Emission) monitor values, the soak timer, which is built
into the ECM, measures 5 hours (+-15 minutes) from when the ignition switch is turned OFF, before the
monitor is run. This allows the fuel to cool down, which stabilizes the EVAP pressure. When 5 hours have
elapsed, the ECM turns on.

MONITOR DESCRIPTION

5 hours after the ignition switch is turned OFF, the soak timer activates the ECM to begin the EVAP
system monitor. While the engine is running, the ECM monitors the synchronization of the soak timer and
the CPU clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the
MIL and sets the DTC (2 trip detection logic).

MONITOR STRATEGY

DTC

P2610

ECM / PCM Internal Engine Off Timer Perfor-
mance

DTC

Monitoring Items

Malfunction Detection

Conditions

Trouble Areas

Detection

Timings

Detection

Logic

P2610

Soak timer (built into ECM)

ECM internal malfunction

ECM

Engine
running

2 trip

Required Sensors/Components

ECM

Frequency of Operation

Once per driving cycle

IGN

EFI

Ignition Switch

AM2

IGSW

MREL

ECM

Power Source IC

Main Relay Control IC

Soak Timer IC

Battery

Soak Timer Circuit:

A133428E01

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