Toyota Tundra Service Manual: Throttle Actuator Control Motor Circuit Low (P2102,P2103)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Throttle Actuator Control Motor Circuit Low (P2102,P2103)

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 with motor body assembly. The TP sensor provides feedback to the ECM. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT:

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

DTC No.

DTC Detection Condition

Trouble Area

P2102

Conditions (a) and (b) continue for 2.0 seconds (1 trip detection logic):

(a) Throttle actuator duty ratio 80% or more

(b) Throttle actuator current less than 0.5 A

  • Open in throttle actuator circuit
  • Throttle actuator
  • ECM

P2103

Either of following conditions met (1 trip detection logic):

  • Motor driver IC diagnosis signal failure
  • Motor driver IC current limiter port failure
  • Short in throttle actuator circuit
  • Throttle actuator
  • Throttle valve
  • Throttle with motor body assembly
  • ECM

MONITOR DESCRIPTION

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and stores a DTC.

Example:

When the electrical current is less than 0.5 A and the throttle actuator duty ratio exceeds 80%, the ECM interprets this as the current being outside the standard range, and illuminates the MIL and stores a DTC.

If the malfunction is not repaired successfully, a DTC is stored 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

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

25 times: P2103 (Case 1)

0.6 seconds: P2103 (Case 2)

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not present

None

P2102

Throttle actuator

ON

Duty-cycle to throttle actuator

80% or more

Throttle actuator power supply

8 V or more

P2103

Battery voltage

8 V or more

Starter

OFF

Electronic throttle actuator

ON

Either of the following conditions 1 or 2 met:

-

1. Electronic throttle actuator power supply voltage

8 V or more

2. Electronic throttle actuator power

ON

TYPICAL MALFUNCTION THRESHOLDS

P2102

Motor current

Less than 0.5 A

P2103 (Case 1)

Motor driver IC high current inhibit signal

ON

P2103 (Case 2)

Motor driver IC high current limiter monitor input

Fail

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Start the engine.
  7. With the vehicle stationary, fully depress the accelerator pedal and quickly release it [B].
  8. Check that 16 seconds or more have elapsed from the instant when the accelerator pedal is first depressed.
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
  10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P2102 or P2103.
  13. Check the DTC judgment result.

    Tester Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [C] again.
  14. If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

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

CAUTION / NOTICE / HINT

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.
  • 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.

PROCEDURE

1.

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (RESISTANCE OF THROTTLE ACTUATOR)

(a) Disconnect the throttle with motor body assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (M+) - 1 (M-)

20°C (68°F)

0.3 to 100 Ω

HINT:

Perform "Inspection After Repair" after replacing the throttle with motor body assembly (See page ).

NG

REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY

OK

2.

CHECK HARNESS AND CONNECTOR (THROTTLE WITH MOTOR BODY ASSEMBLY - ECM)

(a) Disconnect the throttle body connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D9-2 (M+) - D74-19 (M+)

Always

Below 1 Ω

D9-1 (M-) - D74-18 (M-)

Always

Below 1 Ω

D9-2 (M+) or D74-19 (M+) - Body ground

Always

10 kΩ or higher

D9-1 (M-) or D74-18 (M-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY

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

OK:

No foreign objects between throttle valve and housing.

HINT:

Perform "Inspection After Repair" after cleaning the throttle with motor body assembly (See page ).

NG

REMOVE FOREIGN OBJECT AND CLEAN THROTTLE WITH MOTOR BODY ASSEMBLY

OK

4.

INSPECT THROTTLE VALVE

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

OK:

Throttle valve opens and closes smoothly.

HINT:

Perform "Inspection After Repair" after replacing the throttle with motor body assembly (See page ).

OK

REPLACE ECM

NG

REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY

    Secondary Air Injection System Driver (P1613,P1614)

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