Toyota Tundra. Manual — part 1600

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS

FAIL-SAFE

When either of these DTCs, 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 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

DTC OUTPUT RESULT

HINT

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

TP sensor voltage change

No change

Result

Proceed to

P2111 or P2112 is output

A

P2111 or P2112 and other DTCs are output

B

2009 Toyota Tundra

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

B: GO TO DTC 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. And 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.

b. Turn the ignition switch to 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

DTC OUTPUT RESULT

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.

Result

Proceed to

No DTC is output

A

P2111 or P2112 is output

B

2009 Toyota Tundra

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

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.

Fig. 223: Throttle Actuator Control Motor System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE 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 stores the DTC.

DTC

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

2009 Toyota Tundra

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

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

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

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

Related DTCs

P2118 Throttle actuator power supply

Required Sensors/Components (Main)

Throttle actuator, throttle valve, ETCS fuse

Required Sensors/Components (Related)

None

Frequency of Operation

Continuous

Duration

0.8 seconds

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Battery voltage

8 V or more

Electronic throttle actuator power

ON

Throttle actuator power supply voltage (+BM)

Less than 4 V

Throttle actuator power supply voltage (+BM)

11 to 14 V

2009 Toyota Tundra

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