Toyota Tundra. Manual — part 1532

monitor runs when the engine started cold after 7 hours or more have elapsed since the engine was stopped
(ignition switch turned off) on the previous trip. If the difference between the ECT and the IAT on a cold start
exceeds 20°C (36°F), the ECM interprets this as a malfunction in the ECT sensor circuit and IAT sensor circuit,
and stores the DTC.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P011B)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

Related DTCs

P011B: Engine Coolant Temperature (ECT)/Intake Air Temperature
(IAT) sensor correlation

Required Sensors/Components
(Main)

ECT/IAT sensor

Required Sensors/Components
(Related)

-

Frequency of Operation

Once per driving cycle

Duration

7 hours or more

MIL Operation

2 driving cycles

Sequence of Operation

None

The monitor will run whenever these DTCs are not stored

P2610 (ECM internal engine off timer)

All of following conditions met

Conditions 1 and 2

1. All of following conditions met

Conditions (a), (b), (c) and (d)

(a) After ignition switch ON and engine not running time

Less than 20 seconds

(b) Soak Time

7 hours or more

(c) Battery voltage

10.5 V or higher

(d) Time after engine start

15 seconds or more

2. Either of the following conditions are met

Condition (a) and (b)

(a) Minimum IAT after engine start

-10°C (14°F) or higher

(b) ECT before engine start

-10°C (14°F) or higher

Deviated temperature (difference between ECT and
IAT)

Below -20°C (-36°F) or higher than 20°C (36°
F)

2009 Toyota Tundra

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

c. Turn the Techstream on.

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

e. Read DTCs.

Result

RESULT REFERENCE

HINT:

If any DTCs other than P011B are output, troubleshoot those DTCs first.

B: GO TO DTC CHART

A: Go to next step.

2. READ VALUE USING TECHSTREAM (INTAKE AIR TEMPERATURE)

a. Leave the vehicle for 7 hours or more.

HINT:

It is necessary leave the vehicle for 7 hours or more to allow conditions similar to the DTC
detection conditions.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch ON.

d. Turn the Techstream on.

e. Enter the following menus: Powertrain/Engine and ECT/All Data/Intake Air.

f. Read the value displayed on the Techstream.

OK: Difference between the intake air temperature and the actual outside air temperature is
within 10°C (18°F).

HINT:

Temperature readings on the vehicle outside temperature gauge (if equipped) are not suitable for
comparing to the IAT reading. The outside temperature gauge has a significant delay built in to
prevent temperature swings from being displayed on its display. Use an accurate thermometer to
determine the outside air temperature.

NG: REPLACE MASS AIR FLOW METER (See REMOVAL )

Result

Proceed to

P011B

A

P011B and other DTCs

B

2009 Toyota Tundra

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

OK: Go to next step.

3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream on.

d. Enter the following menus: Powertrain/Engine and ECT/All Data/Coolant Temp.

e. Read the value displayed on the Techstream.

OK: The difference between the coolant temperature and the actual outside air temperature
is within 10°C (18°F).

HINT:

If the result is not as specified, check that there are heat sources such as a block heater in the engine
compartment.

NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR (See REMOVAL )

OK: REPLACE ECM (See REMOVAL )

DTC P0120 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT MALFUNCTION;
DTC P0122 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW INPUT; DTC
P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220
THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT; DTC P0222 THROTTLE/PEDAL
POSITION SENSOR/SWITCH "B" CIRCUIT LOW INPUT; DTC P0223 THROTTLE/PEDAL
POSITION SENSOR/SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135 THROTTLE/PEDAL
POSITION SENSOR/SWITCH "A"/"B" VOLTAGE CORRELATION

DESCRIPTION

The TP sensor is mounted on the throttle body, and detects the opening angle of the throttle valve. This sensor is
a non-contact type. It uses Hall-effect elements in order to yield accurate signals even in extreme driving
conditions, such as at high speeds as well as very low speeds.

The TP sensor has 2 sensor circuits, each of which transmits a signal, VTA1 and VTA2. VTA1 is used to detect
the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary
between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA terminals
of the ECM.

As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage
increases. The ECM calculates the throttle valve opening angle according to these signals and controls the
throttle actuator in response to driver inputs. These signals are also used in calculations such as air-fuel ratio
correction, power increase correction and fuel-cut control.

2009 Toyota Tundra

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

Fig. 85: Throttle Pedal Position Sensor Output Voltage Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

DTC

DTC Detection Condition

Trouble Area

P0120

Output voltage of VTA1 quickly
fluctuates beyond lower and upper
malfunction thresholds for 2
seconds when accelerator pedal
depressed (1 trip detection logic)



Throttle Position (TP)
sensor (built into throttle
body)



ECM

P0122

Output voltage of VTA1 0.2 V or
less for 2 seconds when accelerator
pedal depressed (1 trip detection
logic)



TP sensor (built into throttle
body)



Short in VTA1 circuit



Open in VC circuit



ECM

P0123

Output voltage of VTA1 4.54 V or
more for 2 seconds when
accelerator pedal depressed (1 trip
detection logic)



TP sensor (built into throttle
body)



Open in VTA1 circuit



Open in E2 circuit



Short between VC and
VTA1 circuits



ECM

P0220

Output voltage of VTA2 quickly
fluctuates beyond lower and upper
malfunction thresholds for 2
seconds when accelerator pedal
depressed (1 trip detection logic)



TP sensor (built into throttle
body)



ECM

P0222

Output voltage of VTA2 1.75 V or
less for 2 seconds when accelerator
pedal depressed (1 trip detection
logic)



TP sensor (built into throttle
body)



Short in VTA2 circuit



Open in VC circuit



ECM



TP sensor (built into throttle

2009 Toyota Tundra

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