Toyota Tundra. Manual — part 1644

Fig. 317: Fuel Flow Diagram (Fuel Pressure Switching Valve On)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 318: Fuel Flow Diagram (Fuel Pressure Switching Valve Off)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

WIRING DIAGRAM

Fig. 319: Fuel Pressure Switching System - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

NOTE:

Make sure that "Alcohol Density Learning" in the Data List has been completed
before performing the following troubleshooting procedures.
When "Alcohol Density Learning" has not been completed, start the engine and

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:49 PM

Page 669

© 2006 Mitchell Repair Information Company, LLC.

HINT:

When the DTCs are cleared using the Techstream, the alcohol concentration learned value is also cleared.

The engine is difficult to start if the alcohol concentration of the fuel in the fuel tank is high. Therefore, it may
be necessary to crank the engine a few times before it starts.

1. CHECK FUEL LEAK

a. Visually check for fuel leaks.

OK:

No fuel leaks.

HINT:

The fuel pressure is normally 270 to 330 kPa when the fuel pressure switching valve is off,
and 370 to 430 kPa when the valve is on.

If there is a fuel leak, the fuel pressure is below 270 kPa when the fuel pressure switching
valve is off, and below 370 kPa when the valve is on.

NG: REPAIR OR REPLACE FUEL LEAKAGE POINT

OK: Go to Next Step

2. INSPECT FUEL PRESSURE REGULATOR (for HIGH PRESSURE)

a. Install the pressure gauge (See ON-VEHICLE INSPECTION ).

b. Start the engine.

c. Check that the fuel pressure discharge when the ignition switch is turned off.

Fig. 320: Fuel Pressure Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

drive the vehicle at 32 km/h (20 mph) or more and maintain a constant speed for
2 minutes or more.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:49 PM

Page 670

© 2006 Mitchell Repair Information Company, LLC.

HINT:

If the fuel pressure in the high pressure side pressure regulator cannot remain stable, the fuel
pressure changes to below 270 kPa when the fuel pressure switching valve is off, and to below 370
kPa when the fuel pressure switching valve is on.

Result

RESULT CHART

B: REPLACE FUEL PRESSURE REGULATOR (for HIGH PRESSURE) (See REMOVAL )

A: Go to Next Step

3. CHECK FUEL PUMP CONTROL SYSTEM

a. Check the fuel pump control circuit (See FUEL PUMP CONTROL CIRCUIT ).

HINT:

The fuel pump ECU changes the fuel pump drive voltage between high, middle, and low.
The fuel pump is regulated at a voltage consistent with the fuel consumption amount.

The fuel pump ECU changes the drive voltage to high when starting the engine and during
heavy loads, and low when the engine is idling.

4. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PRESSURE SWITCHING VALVE)

a. Install the pressure gauge (See ON-VEHICLE INSPECTION ).

HINT:

In order to reduce the rise in fuel temperature, open the hood during the inspection.

b. Chock the wheels.

c. Securely apply the parking brake.

d. Warm up the engine until the engine coolant temperature is 75°C (167°F) or more.

e. Connect the Techstream to the DLC3.

f. Allow the engine to idle and turn the A/C on (MAX COOL, blower motor on maximum setting).

g. Depress the brake pedal and move the shift lever to D.

Result

Proceed
to

Fuel pressure remains almost constant or discharges gradually after a sudden drop

A

Fuel pressure drops suddenly, and when return hose of the fuel pressure regulator for
high pressure is pinched shut, the sudden fuel pressure drop (fuel pressure drops to 270
kPa or less) stops

B

NOTE:

Check the fuel pump control circuit and proceed to the next step.

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:49 PM

Page 671

© 2006 Mitchell Repair Information Company, LLC.

HINT:

When checking the fuel pressure, it is okay if the shift lever is in N or the air conditioner is off.

h. Enter the following menus: Powertrain/Engine and ECT/Active Test/Activate the Fuel Pressure

Switching Valve/All Data/Short FT #1 and Short FT #2.

i. Using the Active Test, switch the fuel pressure switching valve to "High" and "Low".

j. Check the change in Short FT and the fuel pressure.

HINT:

When performing the Active Test, wait approximately 20 seconds for the Short FT value to
stabilize.

Result

ACTIVE TEST RESULT

HINT:

When normal:

PRESSURE SPECIFICATIONS

Reference values when performing Active Test (E85 Fuel):

ACTIVE TEST REFERENCE VALUE (E85 FUEL)

Result

Condition

Proceed
to

Short FT change is below 7% and fuel pressure does
not change 30 kPa or more

Performing switching between
"High" and "Low"

A

Anything except above

Performing switching between
"High" and "Low"

B

Change in Short FT while performing Active Test 10 to 20%
Active Test State

Low

High

Normal Fuel Pressure

270 to 330 kPa 370 to 430 kPa

Data List

Low

High

AFS Voltage B1 S1

3.23 V 3.10 V

AFS Voltage B2 S1

3.26 V 3.05 V

O2S B1 S2

0.11V 0.33 V

O2S B2 S2

0.13 V 0.21V

Short FT #1

11.7% -16.5%

Long FT #1

-2.4% -2.4%

Short FT #2

11.7% -16.5%

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Saturday, June 19, 2010 7:34:49 PM

Page 672

© 2006 Mitchell Repair Information Company, LLC.

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Политика конфиденциальности