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SFI SYSTEM (w/ EGR System), Diagnostic DTC:P2118

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DTC Code DTC Name
P2118 Throttle Actuator Control Motor Current Range / Performance
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DESCRIPTION

The electronic throttle control system has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (below 4 V), the ECM determines that there is a malfunction in the electronic throttle control system and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the electronic throttle control system 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 power switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

Tip:

This electronic throttle control system does not use a throttle cable.

DTC No. DTC Detection Condition Trouble Area
P2118 An open in electronic throttle control system power source (+BM) circuit (1 trip detection logic).

  • Open in electronic throttle control system power source circuit

  • Auxiliary battery

  • Auxiliary battery terminals

  • ETCS fuse

  • ECM
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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.

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MONITOR STRATEGY

Required Sensors/Components (Main) Throttle actuator, throttle valve (throttle body assembly), ETCS fuse
Frequency of Operation Continuous
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TYPICAL ENABLING CONDITIONS

Auxiliary battery voltage 8 V or higher
Electronic throttle actuator power ON
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TYPICAL MALFUNCTION THRESHOLDS

Throttle actuator power supply voltage (+BM) Below 4 V
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COMPONENT OPERATING RANGE

Throttle actuator power supply voltage (+BM) 11 to 14 V
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CONFIRMATION DRIVING PATTERN


  1. Connect the intelligent tester to the DLC3.

  2. Turn the power switch on (IG) and turn the tester on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).

  4. Turn the power switch off and wait for 30 seconds.

  5. Turn the power switch on (IG) and turn the tester on [A].

  6. Put the engine in inspection mode (maintenance mode) (Click here).

  7. Start the engine.

  8. Slowly depress the accelerator pedal, raise the engine speed to approximately 2500 rpm for approximately 5 seconds, and then idle the engine [B].

  9. Enter the following menus: Powertrain / Engine and ECT / DTC [C].

  10. Read the pending DTCs.

    Tip:

    • 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: P2118.

  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
    UNKNOWN

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
    Tip:

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [C] again.

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FAIL-SAFE

When this DTC or other DTCs relating to 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 5.5° throttle angle by the return spring. The ECM stops the engine and the vehicle can be driven using solely the hybrid system. 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 power switch is then turned off.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tip:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

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PROCEDURE


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    READ VALUE USING INTELLIGENT TESTER (+BM VOLTAGE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / +BM voltage.

    5. Read the value displayed on the tester.

      Table 1. Result
      Result Proceed to
      Less than 11 V, or higher than 14 V A
      11 to 14 V B

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    CHECK HARNESS AND CONNECTOR (ECM - AUXILIARY BATTERY, BODY GROUND)


    1. Disconnect the ECM connectors.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A60-3 (+BM) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D27-19 (ME01) - Body ground Always Below 1 Ω
      D27-104 (E1) - Body ground Always Below 1 Ω

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    CHECK FOR INTERMITTENT PROBLEMSClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE ECMClick here