Toyota Tundra. Manual — part 1171

(ignition switch turned to 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 sets 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 a Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the tester ON.

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

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 present

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 more

(d) Time after engine start

736 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 more

(b) ECT before engine start

-10°C (14°F) or more

Deviated ECT and IAT

Less than -20°C (-36°F) or more than 20°C (36°F)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

e. Read DTCs.

Result

RESULT CHART

HINT:

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

B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE 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 a Techstream to the DLC3.

c. Turn the ignition switch to ON.

d. Turn the tester ON.

e. Enter the following menu: 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's 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 )

OK : Go to next step

Result

Proceed To

P011B

A

P011B and other DTCs

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

3. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

a. Connect a Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the tester ON.

d. Enter the following menu: 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 if 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.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 74: Throttle/Pedal Position Sensor/Switch Circuit Diagram

DTC TROUBLE DETECTION CONDITION CHART

DTC

No.

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



TP sensor (built into
throttle body)

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra