SFI SYSTEM (w/ Electronic Throttle Control System), Diagnostic DTC:P0122, P0123, P0222, P0223

DTC Code DTC Name
P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input
P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input
P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input
P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input

DESCRIPTION

Tech Tips

This ETC (Electrical Throttle Control System) does not use a throttle cable.

The Throttle Position (TP) sensor is mounted on the throttle body assembly, and detects the opening angle of the throttle valve.

The TP sensor has two sensor circuits which each transmits a signal, VTA1 and VTA2. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary between 0 V and 5 V. The VTA1 sensor signal voltage vary in proportion to the throttle valve opening angle, and are transmitted to the VTA terminals of the ECM.

As the valve closes, the VTA1 sensor output voltage decreases and as the valve opens, the VTA1 sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs.

A013815E01
DTC No. DTC Detection Condition Trouble Area
P0122

Output voltage of VTA1 0.2 V or less for 0.14 seconds or more

(1 trip detection logic).

  • TP sensor (built into throttle body assembly)


  • Open or short in VTA1 circuit


  • Open in VC circuit


  • ECM
P0123

Output voltage of VTA1 4.6 V or more

(1 trip detection logic).

  • TP sensor (built into throttle body assembly)


  • Open in VTA1 circuit


  • Open in E2 circuit


  • Short between VC and VTA1 circuits


  • ECM
P0222

Output voltage of VTA2 0.156 V or less when engine speed is 1200 rpm or more for 0.14 seconds or more

(1 trip detection logic).

  • TP sensor (built into throttle body assembly)


  • Open or short in VTA2 circuit


  • Open in VC circuit


  • ECM
P0223

Output voltage of VTA2 4.883 V or more

(1 trip detection logic).

  • TP sensor (built into throttle body assembly)


  • Open in VTA2 circuit


  • Open in E2 circuit


  • Short between VC and VTA2 circuits


  • ECM

Tech Tips


  • Detection is always being performed for P0122, P0123 and P0223 when the ignition switch is ON or the engine is running.

  • Detection for P0222 is performed when the engine speed is 1200 rpm or greater.

WIRING DIAGRAM

A0137P5E02

INSPECTION PROCEDURE

Note

After replacing the ECM and/or throttle body assembly, perform electronic throttle learning Click here.

Tech Tips

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.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (THROTTLE BODY ASSEMBLY - ECM)


    1. A0138FJE01

      Disconnect the throttle body assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B28-3 (VC) - B25-57 (VC) Always Below 1 Ω
      B28-6 (VTA) - B25-14 (VTA1) Always Below 1 Ω
      B28-5 (VTA2) - B25-15 (VTA2) Always Below 1 Ω
      B28-2 (E2) - B25-35 (ETA) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B28-3 (VC) or B25-57 (VC) - Body ground Always 10 kΩ or higher
      B28-6 (VTA) or B25-14 (VTA1) - Body ground Always 10 kΩ or higher
      B28-5 (VTA2) or B25-15 (VTA2) - Body ground Always 10 kΩ or higher
      B28-2 (E2) or B25-35 (ETA) - Body ground Always 10 kΩ or higher
      B28-6 (VTA) or B25-14 (VTA1) - B28-3 (VC) or B25-57 (VC) Always 10 kΩ or higher
      B28-5 (VTA2) or B25-15 (VTA2) - B28-3 (VC) or B25-57 (VC) Always 10 kΩ or higher

    4. Reconnect the throttle body assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK TERMINAL VOLTAGE (THROTTLE BODY ASSEMBLY CONNECTOR)


    1. A01384XE06

      Disconnect the throttle body assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B28-3 (VC) - B28-2(E2) Ignition switch ON 4.5 to 5.5 V

    3. Reconnect the throttle body assembly connector.


    NG

    REPLACE ECM Click here

    OK

  3. REPLACE THROTTLE BODY ASSEMBLY


    1. Replace the throttle body assembly Click here.

    2. Perform electronic throttle learning Click here.


    NEXT

    END