Toyota Tundra. Manual — part 1479

CHECK FOR INTERMITTENT PROBLEMS

HINT:

Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream
when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive
to malfunctions than normal mode (default), which uses 2 trip detection logic.

1. Clear the DTCs (see DTC CHECK/CLEAR ).

2. Switch the ECM from normal mode to check mode using the Techstream (see CHECK MODE

PROCEDUREdd ).

3. Perform a simulation test.

4. Check and wiggle the harness(es), connector(s) and terminal(s).

BASIC INSPECTION

When a malfunction is not confirmed by the DTC check, troubleshooting should be carried out in all circuits
considered to be possible causes of the problem. In many cases, by carrying out the basic engine check shown
in the following flowchart, the location of the problem can be found quickly and efficiently. Therefore, using
this check is essential when performing engine troubleshooting.

1. CHECK BATTERY VOLTAGE

Result

RESULT REFERENCE

NG: CHARGE OR REPLACE BATTERY

OK: Go to next step.

2. CHECK WHETHER ENGINE WILL CRANK

NG: PROCEED TO PROBLEM SYMPTOMS TABLE

OK: Go to next step.

3. CHECK WHETHER ENGINE STARTS

NG: GO TO STEP 6

NOTE:

Conduct this check with the engine stopped and ignition switch off.

Result

Proceed to

11 V or more

OK

Below 11 V

NG

2009 Toyota Tundra

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

OK: Go to next step.

4. CHECK AIR FILTER

a. Visually check that the air filter is not excessively contaminated with dirt or oil.

NG: REPLACE AIR FILTER

OK: Go to next step.

5. CHECK IDLING SPEED

NG: TROUBLESHOOT IDLING SPEED AND PROCEED TO NEXT STEP

OK: Go to next step.

6. CHECK FUEL PRESSURE

NG: TROUBLESHOOT FUEL PRESSURE AND PROCEED TO NEXT STEP

OK: Go to next step.

7. CHECK FOR SPARK

NG: TROUBLESHOOT SPARK AND PROCEED TO NEXT STEP

OK: PROCEED TO PROBLEM SYMPTOMS TABLE

REGISTRATION

HINT:

The VIN is in the form of a 17-digit alphanumeric vehicle identification number. The Techstream is required to
register the VIN.

1. DESCRIPTION

HINT:

This registration section consists of two parts: Read VIN and Write VIN.

NOTE:

The Vehicle Identification Number (VIN) must be input into the replacement
ECM.

NOTE:

The Vehicle Identification Number (VIN) must be input into the replacement
ECM.

2009 Toyota Tundra

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

a. Read VIN: Explains the VIN reading process in a flowchart. This process allows the VIN stored in

the ECM to be read in order to confirm that the two VINs, provided with the vehicle and stored in
the vehicle's ECM, are the same.

b. Write VIN: Explains the VIN writing process in a flowchart. This process allows the VIN to be

input into the ECM. If the ECM is changed, or the ECM VIN and vehicle VIN do not match, the
VIN can be registered, or overwritten in the ECM by following this procedure.

2. READ VIN

a. Confirm the vehicle VIN.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch to ON.

d. Turn the Techstream ON.

e. Enter the following menus: Powertrain/Engine and ECT/Utility/VIN/VIN Read.

3. WRITE VIN

a. Confirm the vehicle VIN.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch to ON.

d. Turn the Techstream ON.

e. Enter the following menus: Powertrain/Engine and ECT/Utility/VIN/VIN Write.

CHECKING MONITOR STATUS

The purpose of the monitor result (mode 06) is to allow access to the results of on-board diagnostic monitoring
tests of specific components/systems that are not continuously monitored. Examples are catalysts, evaporative
emissions (EVAP) and thermostats.

The monitor result allows the OBD II scan tool to display the monitor status, test value, minimum test limit and
maximum test limit. These data are displayed after the vehicle has been driven to run the monitor.

When the test value is not between the minimum and maximum test limits, the ECM (PCM) interprets this as a
malfunction. If the test value is on the borderline of the test limits, the component is likely to malfunction in the
near future.

Perform the following procedures to view the monitor status. Although these procedures refer to the
Lexus/Toyota diagnostic tester , the monitor status can be checked using a generic OBD II scan tool. Refer to
your scan tool operator's manual for specific procedural information.

1. PERFORM MONITOR DRIVE PATTERN

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and the Techstream ON.

c. Clear the DTCs (see DTC CHECK/CLEAR ).

d. Run the vehicle in accordance with the applicable drive pattern described in READINESS

MONITOR DRIVE PATTERN (see READINESS MONITOR DRIVE PATTERN ). Do not turn
the ignition switch off.

2009 Toyota Tundra

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

HINT:

The test results will be lost if the ignition switch is turned off.

2. ACCESS MONITOR RESULT

a. Enter the following menus: Powertrain/Engine and ECT/Monitor/Result. The monitor status

appears after the component name.



PASS: The component is functioning normally.



FAIL: The component is malfunctioning.

b. Confirm that the component is either PASS or FAIL.

c. Select the component and press ENTER. The accuracy test value appears if the monitor status is

either PASS or FAIL.

3. CHECK COMPONENT STATUS

a. Compare the test value with the minimum test limit (MIN LIMIT) and maximum test limit (MAX

LIMIT).

b. If the test value is between the minimum and maximum test limits, the component is functioning

normally. If not, the component is malfunctioning. The test value is usually not near the test limits.
If the test value is on the borderline of the test limits, the component is likely to malfunction in the
near future.

HINT:

The monitor result might on rare occasions be PASS even if the malfunction indicator lamp (MIL)
is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be
caused by an intermittent problem.

4. MONITOR RESULT INFORMATION

If you use a generic scan tool, multiply the test value by the scaling value listed below.

A/F Sensor (for Bank 1 Sensor 1)

MONITOR RESULT INFORMATION - A/F SENSOR

A/F Sensor (for Bank 2 Sensor 1)

MONITOR RESULT INFORMATION - A/F SENSOR

Monitor ID

Test ID

Scaling

Unit

Description

$01

$8E

Multiply by 0.001

V

A/F sensor deterioration level

$01

$91

Multiply by 0.004

mA A/F sensor current

Monitor ID

Test ID

Scaling

Unit

Description

$05

$8E

Multiply by 0.001

V

A/F sensor deterioration level

$05

$91

Multiply by 0.004

mA A/F sensor current

2009 Toyota Tundra

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