Content .. 66 67 68 69 ..

Toyota Corolla (2004+). Manual - part 68

05-241

DIAGNOSTICS

SFI SYSTEM (April, 2003)

INSPECT FUEL TANK INLET VALVE ASSY

NG REPLACE FUEL TANK INLET VALVE ASSY

INSPECT FUEL TANK ASSY

NG REPLACE FUEL TANK ASSY

IT IS LIKELY THAT VEHICLE USER DID NOT PROPERLY CLOSE FUEL TANK CAP

05-242

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

052NT-10

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

MONITOR DESCRIPTION

DTC P0451, P0452 or P0453 is recorded by the ECM when the vapor pressure sensor malfunctions.

P0451

The ECM senses pressure in the fuel tank using the vapor pressure sensor. The ECM supplies the sensor

with a regulated 5 V reference-voltage and the sensor returns a signal voltage between 0.5 V and 4.5 V

according to the pressure level in the fuel tank.

When the pressure in the fuel tank is low, the output voltage of the vapor pressure sensor is low. When it

is high, the output voltage is high.

For this DTC P0451, the ECM checks for a ”noisy” sensor or a ”stuck” sensor.

The ECM checks for the ”noisy” sensor by monitoring the fuel tank pressures when the vehicle is stationary

and there should be little variation in the tank pressure. If the indicated pressure varies beyond specified

limits, the ECM will illuminate the MIL and a DTC is set.

The ECM checks for the ”stuck” sensor by monitoring the fuel tank pressure for an extended time period.

If the indicated pressure does not change over this period, the ECM will conclude that the fuel tank pressure

sensor is malfunctioning. The ECM will illuminate the MIL and a DTC is set.

P0452 and P0453

The ECM senses pressure in the fuel tank using the vapor pressure sensor. The ECM supplies the sensor

with a regulated 5 V reference-voltage and the sensor returns a signal voltage between 0.5 V and 4.5 V

according to the pressure level in the fuel tank.

When the pressure in the fuel tank is low, the output voltage of the vapor pressure sensor is low. When it

is high, the output voltage is high.

If the output voltage of the vapor pressure sensor is out of the normal range, the ECM will determine that

there is a malfunction in the sensor or sensor circuit.

When pressure indicated by the vapor pressure sensor deviates below -3.999 kpa (-30 mmHg) or above

1.999 kpa (15 mmHg), the ECM interprets this as a malfunction in the vapor pressure sensor. The ECM will

turn on the MIL and a DTC will be set.

05-243

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

Fig. 1

ECM

Vapor Pressure

Sensor

VSV for

(6)

Pressure

VSV for

VSV

Fuel Tank Over

Switching Valve

CCV

for EVAP

(1)

Fill Check Valve

(4)

(2)

(5)

(10)

(7)

(8)

(11)

(9)

(3)

Charcoal Canister

Fuel Tank

A73631

DTC No.

DTC Detection Condition

Trouble Area

F Vapor pressure sensor’s voltage output extremely changes

under the following conditions: (a) and (b) (2 trip detection

logic):

(a) Vehicle speed: 0 km/h (0mph), Engine speed: Idling, and

VSV for pressure switching valve: OFF

P0451

(b) Vapor pressure sensor value greater than opening pressure

F Open or short in vapor pressure sensor circuit

F Vapor pressure sensor

value of charcoal canister

F ECM

F Vapor pressure sensor’s voltage output remains at fixed value

P0452

Open in vapor pressure sensor circuit

P0453

Short in vapor pressure sensor circuit

MONITOR STRATEGY

P0451

Evaporative emission control system pressure

Related DTCs

P0451

sensor range/performance

Main sensors

Vapor pressure sensor

Required sensors/components

Mass air flow sensor, engine coolant temperature

Related sensors

sensor

Frequency of operation

Once per driving cycle

Signal fluctuation (noise) monitoring: 10 seconds

Duration

No signal change (stuck) monitoring: 20 minutes

MIL operation

2 driving cycles

Sequence of operation

None

05-244

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

P0452 and P0453

Evaporative emission control system pressure

P0452

sensor/switch low input

Related DTCs

Evaporative emission control system pressure

P0453

sensor/switch high input

Main sensors

Vapor pressure sensor

Required sensors/components

Mass air flow sensor, engine coolant temperature

Related sensors

sensor

Frequency of operation

Once per driving cycle

Duration

7 seconds

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

P0451

Specification

Item

Minimum

Maximum

The monitor will run whenever the follow-

See ”List of Disable a Monitor” (On page 05-25)

ing DTCs are not present

Signal fluctuation (noise) monitoring:

Altitude

2,400 m (7,872 ft)

Difference between intake air temperature

and engine coolant temperature at engine

-7_C (-19.4_F)

11.1_C (52_F)

start

Engine coolant temperature at engine

4.4_C (40_F)

35_C (95_F)

start

Intake coolant temperature at engine start

4.4_C (40_F)

35_C (95_F)

Vehicle stop and idling

5 seconds

15 seconds

Stuck monitoring:

Altitude

2,400 m (7,872 ft)

Vapor pressure sensor

No malfunction

Difference between intake air temperature

and engine coolant temperature at engine

-7_C (-19.4_F)

11.1_C (52_F)

start

Engine coolant temperature at engine

4.4_C (40_F)

35_C (95_F)

start

Intake air coolant temperature at engine

4.4_C (40_F)

35_C (95_F)

start

Time after engine start

6 seconds

P0452 and P0453

Specification

Item

Minimum

Maximum

The monitor will run whenever the follow-

See ”List of Disable a Monitor” (On page 05-25)

ing DTCs are not present

Difference between intake air temperature

and engine coolant temperature at engine

12_C (22_F)

start

Engine coolant temperature at engine

10_C (50_F)

35_C (95_F)

start

Intake air temperature at engine start

10_C (50_F)

35_C (95_F)

Engine

Running

05-245

DIAGNOSTICS

SFI SYSTEM (April, 2003)

TYPICAL MALFUNCTION THRESHOLDS

P0451

Detection Criteria

Threshold

Signal fluctuation (noise) monitoring:

The number of times the output changed

0.667 kpa (5

mmhg) or more during 5 to 15 seconds after idling and ve-

7 times or more

hicle stop

No signal change (stuck) monitoring:

Fuel tank pressure ”no change” time (less than 0.18 kpa

20 minutes or more

(1.35 mmHg) after engine start)

P0452 and P0453

Detection Criteria

Threshold

P0452:

Fuel tank pressure

Less than -3.999 kPa (-30 mmHg)

P0453:

Fuel tank pressure

1.999 kPa (15 mmHg) or more

WIRING DIAGRAM

Refer to DTC No. P0441 on page 05-193.

INSPECTION PROCEDURE

HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output

simultaneously, terminal E2 may be open.

If DTC P0441 (Purge Flow), P0446 (VSV for CCV), P0451, P0452 or P0453 (Evaporative Pressure

Sensor) is output with DTC P0442 or P0456, troubleshoot DTC P0441, P0446, P0451, P0452 or

P0453 first. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.

Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records

the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determin-

ing whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio

was lean or rich, etc. at the time of the malfunction.

If the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor

pressure sensor.

INSPECT ECM(VC VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage between the terminals of the E3

ECM connector.

Standard:

Tester Connection

Specified Condition

VC (E3-18) - E2 (E3-28)

4.5 to 5.5 V

VC (+)

E2 (-)

NG REPLACE ECM (See page 10-11)

ECM Connector

A18294

05-246

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

INSPECT ECM(PTNK VOLTAGE)

(a) Turn the ignition switch ON.

(b) Measure the voltage between the terminals of the E3 and

E6 ECM connectors.

(1)

Disconnect the vacuum hose from the vapor pres-

sure sensor.

Standard (1):

Tester Connection

Specified Condition

E2 (-)

PTNK (+)

PTNK (E6-21) - E2 (E3-28)

2.9 to 3.7 V

(2)

Using the MITYVAC (Hand-Held Vacuum Pump),

apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg)

Vapor Pressure Sensor:

to the vapor pressure sensor.

(1)

(2)

NOTICE:

The vacuum applied to the vapor pressure sensor must be

less than 66.7 kPa (500 mmHg, 19.7 in.Hg).

Standard (2):

Tester Connection

Specified Condition

PTNK (E6-21) - E2 (E3-28)

0.5 V or less

Disconnect

Vacuum

(3)

Reconnect the vacuum hose.

A82252

A82254

OK REPLACE ECM (See page 10-11)

CHECK HARNESS AND CONNECTOR(VAPOR PRESSURE SENSOR - ECM)

(a) Disconnect the V4 vapor pressure sensor connector.

Wire Harness Side:

(b) Disconnect the E3 and E6 ECM connectors.

Vapor Pressure Sensor Connector

(c)

Check the resistance between the wire harness side con-

nectors.

Standard (Check for open):

Tester Connection

Specified Condition

PTNK (V4-2) - PTNK (E6-21)

GND PTNK VCC

GND (V4-1) - E2 (E3-28)

Below 1 W

Front View

VCC (V4-3) - VC (E3-18)

A72886

Standard (Check for short):

Tester Connection

Specified Condition

PTNK (V4-2) or PTNK (E6-21) - Body ground

10 kW or higher

VCC (V4-3) or VC (E3-18) - Body ground

(d) Reconnect the ECM connectors.

(e) Reconnect the vapor pressure sensor connector.

PTNK

NG REPAIR OR REPLACE HARNESS OR

ECM Connector

A79127

CONNECTOR

REPLACE VAPOR PRESSURE SENSOR ASSY

05-247

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

05DIR-01

DTC

P0500

VEHICLE SPEED SENSOR ”A”

CIRCUIT DESCRIPTION

The vehicle equipped with ABS detects a vehicle speed using the stability control ECU and wheel speed

sensor. This sensor monitors a wheel rotation speed and sends the signal to the ECU.

The stability control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM

via the combination meter.

The ECM determines the vehicle speed based on the frequency of these pulse signals.

In the vehicle without ABS, the No. 1 vehicle speed sensor outputs a 4-pulse signal for every revolution of

the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is con-

verted into a more precise rectangular waveform by the waveform shaping circuit inside the combination

meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency

of these pulse signal.

w/ ABS:

4-Pulse

Stability

From Wheel

Control

ECM

Speed Sensor

Combination

ECU

Meter

A79413

w/o ABS:

4-Pulse

No.1 Vehicle

Speed Sensor

Combination Meter

ECM

Q00515

05-248

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

DTC No.

DTC Detection Condition

Trouble Area

The ECM detects following conditions simultaneously 500

times (2 trip detection logic):

F Open or short in speed sensor circuit

F No SP1 (speed sensor) signal while ECM detects SP2 (No. 2

F Speed sensor

speed sensor) signal

P0500

F Combination meter

F Vehicle speed is 6 mph (9 km/h) or more for 4 seconds

F ECM

F Park/Neutral position switch is OFF (Shift lever is in other

F Stability control ECU

than P and N positions)

F Transfer is in other than N position

MONITOR DESCRIPTION

Equipped with ABS:

The ECM assumes that the vehicle is driven when the RPM of the transmission counter gear indicates more

than 300 rpm and it has been over 30 seconds since the park/neutral position switch was turned OFF. If there

is no signal from the vehicle speed sensor with these conditions satisfied, the ECM concludes that there is

a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.

Not equipped with ABS:

The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been

over 4 seconds since the actual vehicle speed was 9 km/h or more.

If there is no signal from the vehicle speed sensor with these conditions satisfied, the ECM concludes that

there is a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.

MONITOR STRATEGY

Related DTCs

P0500

Vehicle speed sensor ”A” pulse input error

Main sensors

Vehicle speed sensor

Required sensors/components

Park/Neutral position switch, engine coolant tem-

Related sensors

perature sensor, combination meter

Frequency of operation

Continuous

w/ ABS: 2 seconds

Duration

w/o ABS: 8 seconds

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Specification

Item

Minimum

Maximum

The monitor will run whenever the follow-

See ”List of Disable a Monitor” (On page 05-25)

ing DTCs are not present

w/o ABS:

Engine coolant temperature

70 _C

Engine speed

2,000 rpm

5,000 rpm

Intake air amount per engine revolution

0.42 g/rev

Fuel cut at high engine speed

Not executing

w/ ABS:

Either of following condition is met

(a) or (b)

(a) Following conditions are met

1 and 2

1. Engine coolant temperature

20_C

2. Time after park/neutralposition switch

10 seconds

ON to OFF

(b) Following conditions are met

1 and 2

1. Engine coolant temperature

20_C

2. Time after park/neutral position switch

30 seconds

ON to OFF

05-249

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

2650 rpm

Engine speed

(vary with throttle opening angle)

2 seconds

(Intake air temperature is -10_C or more)

Detection time on intake air temperature

8 seconds

(Intake air temperature less than -10_C )

Time after IG SW ON

3 seconds

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

Vehicle speed sensor signal

No pulse input

WIRING DIAGRAM

ECM

Combination Meter

Center J/B

SPD

V-W

A84931

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records the

engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether

the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich,

etc. at the time of the malfunction.

CHECK OPERATION OF SPEEDOMETER

(a) Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.

HINT:

The vehicle speed sensor is operating normally if the speedometer display is normal.

NG CHECK SPEEDOMETER CIRCUIT

(See page 05-640)

05-250

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

INSPECT ECM(SPD VOLTAGE)

(a) Shift the lever to the neutral position.

E1 (-)

SPD (+)

(b) Jack up the vehicle.

(c)

Turn the ignition switch ON.

(d) Check the voltage between the terminals of the E4 and E5

ECM connectors as the wheel is turned slowly.

Standard:

Tester Connection

Specified Condition

SPD (E5-17) - E1 (E4-7)

Voltage is generated intermittently

ECM Connector

A18294

HINT:

The output voltage should fluctuate up and down similarly to the

4.5-5.5V

diagram on the left when the wheel is turned slowly.

Turn Wheel

NG REPAIR OR REPLACE HARNESS OR

CONNECTOR

A62954

REPLACE ECM (See page 10-11)

05-251

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

05DIS-01

DTC

P0505

IDLE AIR CONTROL SYSTEM

DTC

P0511

IDLE AIR CONTROL CIRCUIT

CIRCUIT DESCRIPTION

The rotary solenoid type idle air control (IAC) valve is located

under the throttle body and intake air bypassing the throttle

Intake Air

Chamber

valve flows into the IAC valve through the passage.

Throttle Valve

In this way the intake air volume bypassing the throttle valve is

regulated, controls the engine speed.

From

The ECM operates the IAC valve only to perform idle-up and

Air

provide feedback for the target idling speed.

Cleaner

Signal

ECM

Valve

To Cylinder

IAC Valve

A58697

DTC No.

DTC Detecting Condition

Trouble Area

F Open or short in idle air control (IAC) valve circuit

Idle air continues to vary greatly from target speed

F Idle air control (IAC) valve is stuck or closed

P0505

(2 trip detection logic)

F A/C switch circuit

F Air induction system

F PCV valve and hose

P0511

Open or short ISC circuit

F ECM

05-252

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

MONITOR DESCRIPTION

Idle Engine

RPM

Large

Maximum

Target RPM

Learned Value

Angle of ISC

Actual Idle RPM

Minimum

Small

Time

A82389

The idle speeds are determined depending on the volume of air that passes through the IAC valve. When

the volume is large, the idle speed becomes higher. When the volume is small, the idle speed becomes lower.

The IAC valve controls the air volume that bypasses the throttle valve. The engine control module (ECM)

sends duty signals to the IAC valve and drives the IAC valve stepper motor to determine the air volume that

bypasses the throttle valve.

Although the ECM regulates the idle engine RPM with the feedback control in several vehicle stopped, actual

idle RPM does not reach the targeted RPM and a learned valve angle of the idle air control (IAC) remains

at the maximum or remains at the minimum, the ECM determines to detect malfunction in the IAC system.

Example:

If the RPM difference between the targeted and actual idle engine RPMs exceeds 200 rpm (*1) with the ve-

hicle stopped in an idle, and this occurs 5 times, or if the learned value angle of the IAC remains at its maxi-

mum or minimum angle for 5 seconds, P505 is detected.

P0511 is detected as an open/short circuit in the IAC if the rate of duty signal input to the IAC valve has stuck

at 0 or 100 %.

*1: Threshold RPM is varied by an engine load.

05-253

DIAGNOSTICS

SFI SYSTEM (April, 2003)

MONITOR STRATEGY

P0505

Idle air control valve

Related DTCs

P0511

Idle air control valve

Main sensors

Crankshaft position sensor

Required sensors/components

Vehicle speed sensor, engine coolant tempera-

Related sensors

ture sensor

P0505 Functional check: once per driving cycle

Frequency of operation

P0505 Range check, P0511: continuous

P0505 Functional check: 10 minutes

Duration

P0505 Range check, P0511: 10 seconds

P0505 Functional check: 2 driving cycles

MIL operation

P0505 Range check, P0511: Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITION

Specification

Item

Minimum

Maximum

The monitor will run whenever the follow-

See ”List of Disable a Monitor” (On page 05-25)

ing DTCs are not present

P0505 Functional check:

Battery voltage

11 V

Engine coolant temperature

75_C (167_F)

Idle

ON (more than 6 seconds)

Vehicle speed

1.8 mph (3 km/h)

Engine speed

400 rpm

P0505 Range check:

Output signal duty

10 %

90 %

Battery voltage

10 V

P0511:

Output signal duty

10 %

90 %

Battery voltage

10 V

Time after first missing of voltage change

10 sec

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria

Threshold

P0505 Functional check:

Following conditions are met

Case1: A and B (5 times)

(At idle (after running with more than 6.2 mph (10 km/h)

Case2: B (5 seconds)

per trip)

A. Either of the following conditions is met:

1 or 2

1. Deviation of engine speed

Less than - 100 rpm or more than 200 rpm

(When shift position N or A/C ON)

2. Deviation of engine speed

Less than - 100 rpm or more than 150 rpm

(When shift position D or A/C OFF)

B. Either of the following condition is met:

1 or 2

1. IAC flow rate learning value (A/C OFF)

0.5 L/sec or less or 2.75 L/sec or more

2. IAC flow rate learning value (A/C ON)

0.22 L/sec or less or 0.98 L/sec or more

P0505 Range check:

Number of missing output voltage change

2,000 times or more

P0511:

Number of missing output voltage change

1,000 times or more

05-254

DIAGNOSTICS

- SFI SYSTEM (April, 2003)

COMPONENT OPERATING RANGE

Parameter

Standard value

P0505, P0511:

Time while no missing voltage change

0.5 seconds or more

WIRING DIAGRAM

Instrument

Panel J/B

Ignition Switch

AM2

IG2

AM2

B-W

B-R

B-W

EA1

IA4

R-W

B-W

EA1

B-R

ECM

EFI

Relay

EFI

MAIN

IAC Valve

Engine

Rome J/B

B-L

RSO

and R/B

DUTY

9 EA1

VISC

MAIN

W-B

W-B B

W-B

GND 3

Battery

Junction

Connector

A84938

05-255

DIAGNOSTICS

SFI SYSTEM (April, 2003)

INSPECTION PROCEDURE

HINT:

When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a

floor carpet is overlapped on the accelerator pedal, or if not fully releasing the accelerator pedal, etc.,

DTC P505 will possibly be detected.

Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records

the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determin-

ing whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio

was lean or rich, etc. at the time of the malfunction.

Hand-held tester:

CHECK OTHER DTC OUTPUT

(a) Connect the hand-held tester to the DLC3.

(b) Turn the ignition switch ON and push the hand-held tester main switch ON.

(c)

Read the DTCs.

Result:

Display (DTC output)

Proceed to

P0505

P0511 and other DTCs

Go to step 7

CHECK CONNECTION OF PCV HOSE

NG REPAIR OR REPLACE PCV HOSE

CHECK AIR INDUCTION SYSTEM

NG REPAIR OR REPLACE

Content .. 66 67 68 69 ..