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Toyota FJ Cruiser (GSJ 10, 15 series). Instruction - part 70

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–235

DTC SUMMARY

DTC

P0450

Evaporative Emission Control System Pressure
Sensor / Switch

DTC

P0451

Evaporative Emission Control System Pressure
Sensor Range / Performance

DTC

P0452

Evaporative Emission Control System Pressure
Sensor / Switch Low Input

DTC

P0453

Evaporative Emission Control System Pressure
Sensor / Switch High Input

DTC

Monitoring Items

Malfunction Detection Conditions

Trouble Areas

Detection

Timings

Detection

Logic

P0450

Canister pressure sensor
voltage fluctuation
abnormal

Sensor output voltage rapidly fluctuates
beyond upper and lower malfunction
thresholds for 0.5 seconds.

•

Canister pump module

•

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

•

ECM

•

EVAP
monitoring
(ignition OFF)

•

Ignition ON

1 trip

P0451

Canister pressure sensor
noise

Sensor output voltage fluctuates
frequently within certain time period.

•

Canister pump module

•

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

•

EVAP
monitoring
(ignition OFF)

•

Engine
running

2 trip

Canister pressure sensor
signal becomes fixed/flat

Sensor output voltage does not vary
within certain time period.

•

Canister pump module

•

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

•

EVAP
monitoring
(ignition OFF)

2 trip

P0452

Canister pressure sensor
voltage low

Sensor output voltage less than 0.45 V
for 0.5 seconds.

•

Canister pump module

•

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

•

Ignition ON

•

EVAP
monitoring
(ignition OFF)

1 trip

ES–236

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

HINT:
The canister pressure sensor is built into the canister pump module.

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System (See page

ES-352

MONITOR DESCRIPTION

1. DTC P0450: Canister pressure sensor voltage abnormal fluctuation

If the canister pressure sensor voltage output [pressure] rapidly fluctuates between less than 0.45 V
[42.1 kPa-a (315.9 mmHg-a)] and more than 4.9 V [123.8 kPa-a (928.4 mmHg-a)], the ECM interprets
this as an open or short circuit malfunction in the canister pressure sensor or its circuit, and stops the
EVAP (Evaporative Emission) system monitor. The ECM then illuminates the MIL and sets the DTC (1
trip detection logic).

P0453

Canister pressure sensor
voltage high

Sensor output voltage more than 4.9 V
for 0.5 seconds.

•

Canister pump module

•

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

•

Ignition ON

•

EVAP
monitoring
(ignition OFF)

1 trip

DTC

Monitoring Items

Malfunction Detection Conditions

Trouble Areas

Detection

Timings

Detection

Logic

Canister Pressure Sensor Specification:

Pressure

Output Voltage

4.900 V

4.150 V

1.425 V

0.450 V

Malfunction Area

Usable Range

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

HINT:

110

(825)

(450)

kPa-a

(mmHg-a)

A115543E05

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–237

2. DTC P0451: Canister pressure sensor noise or fixed/flat

If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the
EVAP system monitor. The ECM interprets this as noise from the canister pressure sensor, and stops
the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC.
Alternatively, if the sensor voltage output does not change for 10 seconds, the ECM interprets this as
the sensor being fixed/flat, and stops the monitor. The ECM then illuminates the MIL and sets the DTC.
(Both the malfunctions are detected by 2 trip detection logic).

3. DTC P0452: Canister pressure sensor voltage low

If the canister pressure sensor voltage output [pressure] is below 0.45 V [42.1 kPa-a (315.9 mmHg-a)],
the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or its
circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1 trip
detection logic).

4. DTC P0453: Canister pressure sensor voltage high

If the canister pressure sensor voltage output [pressure] is 4.9 V [123.8 kPa-a (928.4 mmHg-a)] or
more, the ECM interprets this as an open or short circuit malfunction in the canister pressure sensor or
its circuit, and stops the EVAP system monitor. The ECM then illuminates the MIL and sets the DTC (1
trip detection logic).

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

P0451 (Noise monitor):

P0451 (Fixed/flat monitor):

P0450, P0452 and P0453:

Required Sensors/Components

Canister pump module

Frequency of Operation

Once per driving cycle: P0451 sensor fixed/flat
Continuous: P0451 sensor noise, P0450, P0452 and P0453

Duration

0.5 seconds: P0450, P0452 and P0453
Within 15 seconds: P0451

MIL Operation

Immediate: P0450, P0452 and P0453
2 driving cycles: P0451

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Atmospheric pressure (absolute pressure)

70 to 110 kPa-a (525 to 825 mmHg-a)

Battery voltage

10.5 V or more

Intake air temperature

4.4

°to 35°C (40° to 95°F)

Canister pressure sensor malfunction (P0450, P0452, 0453)

Not detected

Either of following conditions met

A or B

A. Engine condition

Running

B. Time after key off

5 or 7 or 9.5 hours

Monitor runs whenever following DTCs not present

None

Battery voltage

10.5 V or more

Intake air temperature

4.4

°to 35°C (40° to 95°F)

Canister pressure sensor malfunction (P0450, P0452, 0453)

Not detected

Atmospheric pressure (absolute pressure)

70 to 110 kPa-a (525 to 825 mmHg-a)

Time after key off

5 or 7 or 9.5 hours

Monitor runs whenever following DTCs not present

None

Either of following conditions met

(a) or (b)

(a) Ignition switch

(b) Soak timer

ES–238

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

TYPICAL MALFUNCTION THRESHOLDS

P0450: Canister pressure sensor chattering

P0451: Canister pressure sensor noise

P0451: Canister pressure sensor fixed/flat

P0452: Canister pressure sensor low voltage

P0453: Canister pressure sensor high voltage

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
•

When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle
condition. For example, do not tighten the fuel cap.

•

Do not disassemble the canister pump module.

•

An intelligent tester is required to conduct the following diagnostic troubleshooting procedure.

(a) Connect an intelligent tester to the DLC3.
(b) Turn the ignition switch ON (do not start the engine).

EVAP pressure

Less than 42.1 kPa-a (315.9 mmHg-a), or more than 123.8 kPa-a
(928.4 mmHg-a)

Frequency that EVAP pressure change 0.3 kPa-g (2.25 mmHg-g) or
more

10 times or more in 10 seconds

EVAP pressure change during reference pressure

Less than 0.65 kPa-g (4.87 mmHg-g)

EVAP pressure

Less than 42.1 kPa-a (315.9 mmHg-a)

EVAP pressure

More than 123.8 kPa-a (928.4 mmHg-a)

CONFIRM DTC AND EVAP PRESSURE

SGND

VOUT

VCC

Canister Pump Module

ECM

PPMP

5 V

Canister
Pressure
Sensor

L10

E47

A133419E01

Content .. 68 69 70 71 ..