Toyota Tundra. Manual — part 1233

TYPICAL ENABLING CONDITIONS

P2112 (Throttle actuator stuck closed)

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

P2111 (Throttle actuator stuck open)

TYPICAL MALFUNCTION THRESHOLDS

P2112 (Throttle actuator stuck closed)

TYPICAL MALFUNCTION THRESHOLDS

FAIL-SAFE

When either of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System)
malfunctions, is 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 6° 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 running 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

All of following conditions are met:

-

System guard*

ON

Throttle actuator current

2 A or more

Duty cycle to close throttle

80% or more

All of following conditions are met:

-

System guard*

ON

Throttle actuator current

2 A or more

Duty cycle to open throttle

80% or more

*System guard set when following conditions are met:

-

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 more

Throttle actuator

Fail determined

TP sensor voltage change for 0.016 seconds

Less than 0.1 V for 0.5 seconds or more

TP sensor voltage change for 0.016 seconds

Less than 0.1 V for 0.5 seconds or more

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-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 ON.

c. Turn the Techstream ON.

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

e. Read DTCs.

Result

RESULT CHART

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 (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.

Display (DTC Output)

Proceed To

P2111 or P2112

A

P2111 or P2112 and other DTCs

B

2008 Toyota Tundra

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

b. Turn the ignition switch ON.

c. Turn the Techstream ON.

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

e. Start the engine, and fully depress and release the accelerator pedal quickly (to fully open and close

the throttle valve).

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

g. Read DTCs.

Result

RESULT CHART

B : REPLACE ECM (See REMOVAL )

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

DTC P2118 THROTTLE ACTUATOR CONTROL MOTOR CURRENT RANGE/PERFORMANCE

DESCRIPTION

The ETCS (Electronic Throttle Control System) has a dedicated power supply circuit. The voltage (+BM) is
monitored and when it is low (less than 4 V), the ECM determines that there is a malfunction in the ETCS and
cuts off the current to the throttle actuator.

When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is
low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the
ignition switch OFF. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

HINT:

The ETCS does not use a throttle cable.

Display (DTC Output) Proceed To

No DTC

A

P2111 or P2112

B

2008 Toyota Tundra

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

Fig. 190: Throttle Actuator Control Motor Current Range / Performance - Circuit Diagram

DTC TROUBLE DETECTION CONDITION CHART

MONITOR DESCRIPTION

The ECM monitors the battery supply voltage applied to the throttle actuator.

When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an
open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC.

If the malfunction is not repaired successfully, the DTC is set 5 seconds after the engine is next started.

MONITOR STRATEGY

MONITOR STRATEGY

DTC

No.

DTC Detection Condition

Trouble Area

P2118

Open in ETCS power source (+BM) circuit (1 trip
detection logic)



Open in ETCS power source
circuit



Battery



Battery terminals



ETCS fuse



ECM

Related DTCs

P2118: Throttle actuator power supply

Required Sensors/Components (Main)

Throttle actuator, throttle valve, ETCS fuse

2008 Toyota Tundra

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