Toyota Tundra. Manual — part 1602

MONITOR DESCRIPTION

The ECM determines the actual opening angle of the throttle valve from the TP sensor signal. The actual
opening angle is compared to the target opening angle commanded by the ECM. If the difference between these
two values is outside the standard range, the ECM interprets this as a malfunction in the ETCS. The ECM then
illuminates the MIL and stores the DTC.

If the malfunction is not repaired successfully, the DTC is stored when the accelerator pedal is quickly released
(to close the throttle valve) after the engine speed reaches 5000 RPM by the accelerator pedal being fully
depressed (fully open the throttle valve).

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS

detection logic)

Related DTCs

P2119 ETCS malfunction

Required Sensors/Components (Main)

Throttle actuator

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

Within 1 second

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

System guard*

ON

System guard is ON when the following conditions set

-

Throttle actuator

ON

Throttle actuator duty calculation

Executing

Throttle position sensor

Fail determined

Throttle actuator current-cut operation

Not executing

Throttle actuator power supply

4 V or higher

Throttle actuator

Fail determined

Either of following conditions A or B met

-

A. Difference between commanded closed throttle position and current closed

hrottle position

0.3 V or more for 1
second

B. Difference between commanded open throttle position and current open

0.3 V or more for 0.6

2009 Toyota Tundra

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

FAIL-SAFE

When this DTC, or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions are stored,
the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the
throttle valve is returned to a 7° throttle angle by the return spring. The ECM then adjusts the engine output by
controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal
opening angle, to allow the vehicle to continue at a minimal speed. If the accelerator pedal is depressed firmly
and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned OFF.

WIRING DIAGRAM

Refer to DTC P2102 .

INSPECTION PROCEDURE

HINT

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data
from the time the malfunction occurred.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2119)

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 DTCs.

Result

DTC OUTPUT RESULT

HINT

If any DTCs other than P2119 are output, troubleshoot those DTCs first.

B: GO TO DTC CHART

hrottle position

seconds

Result

Proceed to

P2119 is output

A

P2119 and other DTCs are output

B

2009 Toyota Tundra

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

A: Go to Next Step

2. CHECK WHETHER DTC OUTPUT RECURS (DTC P2119)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Clear DTCs (See DTC CHECK/CLEAR ).

e. Allow the engine to idle for 15 seconds or more.

f. Fully depress and release the accelerator pedal several times quickly.

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

h. Read DTCs.

OK:

No DTC output.

HINT

The output voltage of the throttle position sensor can be checked using the Techstream. Variations
in the output voltage indicate that the throttle actuator is in operation. To check the output voltage
using the Techstream, enter the following menus Powertrain/Engine and ECT/ETCS/Throttle
Position No. 1.

NG: REPLACE THROTTLE BODY ASSEMBLY (See REMOVAL )

OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

DTC P2120 THROTTLE/PEDAL POSITION SENSOR/SWITCH D CIRCUIT; DTC P2122
THROTTLE/PEDAL POSITION SENSOR/SWITCH D CIRCUIT LOW INPUT; DTC P2123
THROTTLE/PEDAL POSITION SENSOR/SWITCH D CIRCUIT HIGH INPUT; DTC P2125
THROTTLE/PEDAL POSITION SENSOR/SWITCH E CIRCUIT; DTC P2127 THROTTLE/PEDAL
POSITION SENSOR/SWITCH E CIRCUIT LOW INPUT; DTC P2128 THROTTLE/PEDAL
POSITION SENSOR/SWITCH E CIRCUIT HIGH INPUT; DTC P2138 THROTTLE/PEDAL
POSITION SENSOR/SWITCH D / E VOLTAGE CORRELATION

DESCRIPTION

HINT

This ETCS (Electronic Throttle Control System) does not use a throttle cable.

The APP sensor is mounted on the accelerator pedal bracket and has 2 sensor circuits VPA (main) and VPA2
(sub). This sensor is a non-contact type and 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 voltage, which is applied to

2009 Toyota Tundra

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

terminals VPA and VPA2 of the ECM, varies between 0.5 V and 4.5 V in proportion to the operating angle of
the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal opening angle
(throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the
VPA circuit and is used to check the APP sensor itself. The ECM monitors the actual accelerator pedal opening
angle (throttle valve opening angle) through the signals from VPA and VPA2, and controls the throttle actuator
according to these signals.

Fig. 228: APP Sensor Circuit With 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

P2120

VPA fluctuates rapidly beyond
upper and lower malfunction
thresholds for 0.5 seconds or more
(1 trip detection logic)



APP sensor



ECM

P2122

VPA 0.4 V or less for 0.5 seconds
or more when accelerator pedal
fully released (1 trip detection
logic)



APP sensor



Open in VCPA circuit



Open or ground short in
VPA circuit



ECM

P2123

VPA 4.8 V or more for 2.0 seconds
or more (1 trip detection logic)



APP sensor



Open in EPA circuit



ECM

VPA2 fluctuates rapidly beyond



APP sensor

2009 Toyota Tundra

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