Toyota Tundra. Manual — part 1598

malfunction is not repaired successfully, a DTC is set when the engine is quickly revved to a high RPM several
times after the engine is started and has idled for 5 seconds.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

P2102:

TYPICAL ENABLING CONDITIONS - P2102

P2103:

TYPICAL ENABLING CONDITIONS - P2103

TYPICAL MALFUNCTION THRESHOLDS

P2102:

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P2102

P2103:

Related DTCs

P2102 Throttle actuator current (low current)
P2103 Throttle actuator current (high current)

Required Sensors/Components (Main)

Throttle actuator (throttle body)

Required Sensors/Components (Related)

None

Frequency of Operation

Continuous

Duration

2 seconds P2102
Within 1 second P2103

MIL Operation

Immediate

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

Throttle actuator

Activated

Duty-cycle ratio to open throttle actuator

80% or more

Throttle actuator power supply

8 V or more

Throttle actuator

Activated

Throttle actuator power supply

8 V or more

Battery voltage

8 V or more

Starter

OFF

Throttle actuator current

Less than 0.5 A

2009 Toyota Tundra

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

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS - P2103

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

Either of the following conditions is met

Condition 1 or 2

1. Hybrid IC diagnosis signal

Fails 25 times

2. Hybrid IC current limiter port

Fails for 0.6 seconds

2009 Toyota Tundra

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

Fig. 220: Throttle Control Actuator Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

2009 Toyota Tundra

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

data from the time the malfunction occurred.



The throttle actuator current (Throttle Motor Current) and the throttle actuator duty ratio (Throttle Motor
Open Duty/Throttle Motor Close Duty) can be read using the Techstream. However, the ECM shuts off
the throttle actuator current when the ETCS malfunctions.

1. INSPECT THROTTLE BODY (RESISTANCE OF THROTTLE ACTUATOR)

a. Disconnect the D9 throttle body connector.

2009 Toyota Tundra

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