Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 67

1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

ES–223

ES

DTC SUMMARY

HINT:
The reference orifice is located inside 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

P043E

Evaporative Emission System Reference Ori-
fice Clog Up

DTC

P043F

Evaporative Emission System Reference Ori-
fice High Flow

DTCs

Monitoring Items

Malfunction Detection Conditions

Trouble Areas

Detection 

Timings

Detection 

Logic

P043E

Reference orifice clogged

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

P043F

Reference orifice high-flow

•

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

Sequ

ence

Operations

Descriptions

Duration

-

ECM activation

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

-

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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

(a) P043E: Reference orifice clogged
In operation B, the leak detection pump creates negative pressure (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 is lower than -4.85 kPa-g (-36.4 mmHg-g), the ECM 
interprets this as a clog malfunction in the reference orifice, and stops the EVAP system monitor.
The ECM then illuminates the MIL and sets the DTC (2 trip detection logic).

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)

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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(b) P043F: Reference orifice high-flow
In operation B, the leak detection pump creates negative pressure (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 is higher than -1.057 kPa-g (-7.93 mmHg-g), the ECM 
interprets this as a high-flow malfunction in the reference orifice, and stops the EVAP system monitor. The 
ECM then illuminates the MIL and sets the DTC (2 trip detection logic).

EVAP Pressure when Reference Orifice Clogged:

Purge VSV

Vent Valve

Leak Detection 
Pump

EVAP Pressure

10 seconds

60 
seconds

60 
seconds

Within 15 minutes

10 
seconds

Malfunction

OK

ON

ON

ON

Positive

Negative

First Reference  
Pressure

Sequence

Time

A

B

C

D

E

ON: Open

OFF: Closed
ON: Closed

OFF: Vent

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1GR-FE ENGINE CONTROL SYSTEM  –  SFI SYSTEM

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MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Required Sensors/Components

Canister pump module

Frequency of Operation

Once per driving cycle

Duration

Within 2 minutes

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

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

EVAP Pressure when Reference Orifice High-flow Malfunction:

Pruge VSV

10 seconds

60 
seconds

60 
seconds

Malfunction

OK

ON

ON

ON

10 
seconds

Vent Valve

Leak Detection 
Pump

EVAP Pressure

Positive

Negative

First Reference  
Pressure

Sequence

Time

A

B

C

D

E

ON: Open

OFF: Closed
ON: Closed

OFF: Vent

Within 15 minutes

A106057E05