Toyota Tundra. Manual — part 1583



Read freeze frame data using the Techstream. The ECM records vehicle and driving condition
information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data
can be helpful in determining whether the vehicle was running or stopped, whether the engine was
warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of
a malfunction.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050B)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

e. Read the DTCs.

Result

DTC OUTPUT RESULT

HINT:

If any DTCs other than P050B are output, troubleshoot those DTCs first.

NG: GO TO DTC CHART

OK: Go to Next Step

2. CHECK THROTTLE BODY

a. Check that there are no deposits around the throttle valve.

OK:

No deposits around the throttle valve.

NG: Go to step 8

OK: Go to Next Step



Generator



Vane pump

Rough idle when engine is cold (immediately after
engine start)

Abnormal
combustion

Fuel quality

Display (DTC Output) Proceed to

P050B

A

P050B and other DTCs

B

2009 Toyota Tundra

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

3

PERFORM ACTIVE TEST USING TECHSTREAM (OCV OPERATION)

a

Connect the Techstream to the DLC3

b

Start the engine and turn the Techstream ON

c

Warm up the engine

d

Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the VVT System
(Bank 1) or Control the VVT System (Bank 2)

e

Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream

OK

OIL CONTROL VALVE OPERATING CONDITIONS

NG: Go to step 9

OK: Go to Next Step

4

CHECK PCV SYSTEM

a

Start the engine

b

Pinch the positive crankcase PCV hose

c

Check the engine speed

OK:

The engine speed rises when the PCV hose is pinched.

NG: Go to step 10

OK: Go to Next Step

5

CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

a

Visually check that the air cleaner filter element is not excessively contaminated with dirt or oil

OK:

The air cleaner filter element is not excessively contaminated with dirt or oil.

NG: Go to step 11

OK: Go to Next Step

6

CHECK AIR INDUCTION SYSTEM

Operation

Specified Condition

OCV OFF Normal engine speed

OCV ON Soon after OCV switched from OFF to ON, engine Idles roughly or stalls

2009 Toyota Tundra

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

a

Check the air induction system for vacuum leaks (see ON-VEHICLE INSPECTION )

OK:

No leakage from the air induction system.

NG: Go to step 12

OK: Go to Next Step

7

REPLACE MASS AIR FLOW METER

a

Replace the mass air flow meter (see REMOVAL )

NEXT: Go to step 13

8

REPAIR OR REPLACE THROTTLE BODY

a

Repair or replace the throttle body (see REMOVAL )

NEXT: Go to step 13

9

CHECK AND REPAIR VVT SYSTEM

NEXT: Go to step 13

10

REPAIR OR REPLACE PCV SYSTEM

NEXT: Go to step 13

11

REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

NEXT: Go to step 13

12

REPAIR OR REPLACE AIR INDUCTION SYSTEM

13

CHECK WHETHER DTC OUTPUT RECURS (DTC P050B)

a

Connect the Techstream to the DLC3

b

Turn the ignition switch to ON

c

Turn the Techstream ON

d

Clear the DTCs (see DTC CHECK/CLEAR )

e

Switch the ECM from normal mode to check mode using the Techstream (see CHECK MODE
PROCEDURE )

NOTE:

For this operation, the engine must be cold (the same level as the engine
coolant temperature recorded in the freeze frame data).

2009 Toyota Tundra

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

f

Start the engine and idle it for one minute

g

Check that the idling is stable and fast

OK:

Stable fast idle

h

Read the DTCs

OK:

No DTC is output.

NG: REPLACE ECM (See REMOVAL )

OK: END

DTC P0550 POWER STEERING PRESSURE SENSOR CIRCUIT MALFUNCTION; DTC P0552
POWER STEERING PRESSURE SENSOR CIRCUIT LOW INPUT; DTC P0553 POWER STEERING
PRESSURE SENSOR CIRCUIT HIGH INPUT

DESCRIPTION

The power steering oil pressure sensor is turned ON when a power steering wheel load occurs by turning the
steering wheel The ECM regulates the engine idling RPM according to the voltage output of the sensor

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

DTC

DTC Detection Condition

Trouble Area

P0550

Power steering oil pressure sensor
voltage less than 0 28 V, or more
than 4 9 V for 0 5 seconds while
engine running (1 trip detection
logic)



Open or short in power
steering oil pressure sensor
circuit



Power steering oil pressure
sensor



ECM

P0552

Power steering oil pressure sensor
voltage less than 0 28 V for 0 5
seconds while engine running (1
trip detection logic)



Open or short in power
steering oil pressure sensor
circuit



Power steering oil pressure
sensor



ECM

P0553

Power steering oil pressure sensor
voltage more than 4 9 V for 0 5
seconds while engine running (1



Open or short in power
steering oil pressure sensor
circuit



Power steering oil pressure

2009 Toyota Tundra

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