Toyota Tundra. Manual — part 1410

Fig. 205: Identifying D9 Throttle Body & D74 ECM Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go to Next Step

3. INSPECT THROTTLE BODY ASSEMBLY

a. Check for foreign objects between the throttle valve and the housing.

OK: No foreign objects between throttle valve and housing.

NG : REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY

OK : Go to Next Step

4. INSPECT THROTTLE VALVE

a. Check if the throttle valve opens and closes smoothly.

OK: Throttle valve opens and closes smoothly.

NG : REPLACE THROTTLE BODY ASSEMBLY (See REMOVAL )

OK : REPLACE ECM (See REMOVAL )

DTC P2111 THROTTLE ACTUATOR CONTROL SYSTEM - STUCK OPEN; DTC P2112
THROTTLE ACTUATOR CONTROL SYSTEM - STUCK CLOSED

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

DESCRIPTION

The throttle actuator is operated by the ECM, and opens and closes the throttle valve using gears. The opening
angle of the throttle valve is detected by the Throttle Position (TP) sensor, which is mounted on the throttle
body. The TP sensor provides feedback to the ECM so that it can control the throttle actuator (throttle valve)
appropriately in response to driver inputs.

HINT:

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

DTC DETECTION CONDITION AND TROUBLE AREA

MONITOR DESCRIPTION

The ECM determines that there is a malfunction in the ETCS when the throttle valve remains at a fixed angle
despite a high drive current from the ECM. The ECM illuminates the MIL and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set when the accelerator pedal is fully depressed and
released quickly (to fully open and close the throttle valve) after the engine is next started.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

DTC

Code

DTC Detection Condition

Trouble Area

P2111

Throttle actuator does not close when signaled by ECM (1 trip
detection logic)



Throttle actuator



Throttle body
assembly



Throttle valve

P2112

Throttle actuator does not open when signaled by ECM (1 trip
detection logic)



Throttle actuator



Throttle body
assembly



Throttle valve

Related DTCs

P2111: Throttle actuator stuck open
P2112: Throttle actuator stuck closed

Required Sensors/Components (Main)

Throttle actuator

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

0.5 seconds

MIL Operation

Immediate

Sequence of Operation

None

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

All:

TYPICAL ENABLING CONDITIONS - ALL

P2111 (Throttle actuator stuck open):

TYPICAL ENABLING CONDITIONS - P2111 (THROTTLE ACTUATOR STUCK OPEN)

P2112 (Throttle actuator stuck closed):

TYPICAL ENABLING CONDITIONS - P2112 (THROTTLE ACTUATOR STUCK CLOSED)

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

FAIL-SAFE

When either of these DTCs, or other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions
are set, 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

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

All of following conditions met

-

Throttle actuator current

2 A or higher

Duty cycle to close throttle

80% or more

All of following conditions met

-

Throttle actuator current

2 A or higher

Duty cycle to open throttle

80% or more

TP sensor voltage change

No change

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

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 P2111 OR P2112)

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

RESULT REFERENCE

HINT:

If any DTCs other than P2111 or P2112 are output, troubleshoot those DTCs first.

B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A : Go to Next Step

2. INSPECT THROTTLE BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

a. Check for contamination between the throttle valve and the housing. If necessary, clean the throttle

body. & check that the throttle valve moves smoothly.

OK: Throttle valve is not contaminated with foreign objects and moves smoothly.

NG : REPLACE THROTTLE BODY ASSEMBLY (See REMOVAL )

OK : Go to Next Step

3. CHECK WHETHER DTC OUTPUT RECURS (DTC P2111 OR P2112)

a. Connect the Techstream to the DLC3.

Result

Proceed To

P2111 or P2112 is output

A

P2111 or P2112 and other DTCs are output

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra