SFI SYSTEM, Diagnostic DTC:P012011,P012015,P01201C,P022011,P022015 and P21352B

DTC Code DTC Name
P012011 Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground
P012015 Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open
P01201C Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range
P022011 Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground
P022015 Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open
P21352B Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled

DESCRIPTION

Tip:

These DTCs relate to the throttle position sensor.

The throttle position sensor is mounted on the throttle body with motor assembly and detects the opening angle of the throttle valve. This sensor is a non-contact type sensor. It uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds.

The throttle position sensor has 2 sensor circuits, VTA1 and VTA2 each of which transmits a signal. 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 in proportion to the throttle valve opening angle, and are transmitted to the VTA1 and VTA2 terminals of the ECM.

As the valve closes, the sensor output voltage decreases and as the valve opens, the 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. These signals are also used in calculations such as air fuel ratio correction, power increase correction and fuel-cut control.

A293043E49

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P012011

Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground

The output voltage of VTA1 is less than 0.56 V for 2 seconds or more (1 trip detection logic).

  • Throttle position sensor (throttle body with motor assembly)

  • Short in VTA1 circuit

  • Open in VCTA circuit

  • ECM

Comes on

DTC stored

SAE Code:

P0122

P012015

Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open

The output voltage of VTA1 is higher than 4.535 V for 2 seconds or more (1 trip detection logic).

  • Throttle position sensor (throttle body with motor assembly)

  • Open in VTA1 circuit

  • Open in ETA circuit

  • Short between VCTA and VTA1 circuits

  • ECM

Comes on

DTC stored

SAE Code:

P0123

P01201C

Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range

The difference between the output voltage of VTA1 and VTA2 is less than 0.8 V, or higher than 1.6 V for 2 seconds or more (1 trip detection logic).

  • Throttle position sensor (throttle body with motor assembly)

  • Throttle position sensor circuit

  • ECM

Comes on

DTC stored

SAE Code:

P0121

P022011

Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Ground

The output voltage of VTA2 is less than 2.05 V for 2 seconds or more (1 trip detection logic).

  • Throttle position sensor (throttle body with motor assembly)

  • Short in VTA2 circuit

  • Open in VCTA circuit

  • ECM

Comes on

DTC stored

SAE Code:

P0222

P022015

Throttle/Pedal Position Sensor/Switch "B" Circuit Short to Battery or Open

The output voltage of VTA2 is higher than 4.75 V, and VTA1 is less than 2.367 V for 2 seconds or more (1 trip detection logic).

  • Throttle position sensor (throttle body with motor assembly)

  • Open in VTA2 circuit

  • Short between VCTA and VTA2 circuits

  • ECM

Comes on

DTC stored

SAE Code:

P0223

P21352B

Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation Signal Cross Coupled

The difference between the output voltages of VTA1 and VTA2 is 0.02 V or less for 2 seconds or more (1 trip detection logic).

  • Throttle position sensor (throttle body with motor assembly)

  • Short between VTA1 and VTA2 circuits

  • Open in ETA circuit

  • ECM

Comes on

DTC stored

SAE Code:

P2135
Tip:

  • When any of these DTCs are output, check the throttle valve opening angle using the GTS. Enter the following menus: Powertrain / Engine / Data List / All Data / Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage.

  • Throttle Position Sensor No.1 Voltage is the VTA1 signal, and Throttle Position Sensor No.2 Voltage is the VTA2 signal.

    Reference (Normal Condition)

    GTS Display

    Accelerator Pedal Fully Released

    Accelerator Pedal Fully Depressed (Engine Running)

    Throttle Position Sensor No.1 Voltage

    0.6 to 1.1 V

    3.2 to 4.8 V

    Throttle Position Sensor No.2 Voltage

    2.1 to 3.1 V

    4.6 to 4.98 V

MONITOR DESCRIPTION

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the throttle position sensor.

  • P012011, P012015, P022011, P022015 and P21352B:

  • A specific voltage difference is expected between the sensor terminals, VTA1 and VTA2, for each throttle valve opening angle. If the difference between VTA1 and VTA2 is incorrect, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

  • VTA1 and VTA2 each have a specific voltage range. If VTA1 or VTA2 is outside the normal operating range, the ECM interprets this as a malfunction in the sensor circuit, and stores a DTC.

  • VTA1 and VTA2 should never be close to the same voltage level. If VTA1 is within 0.02 V of VTA2, the ECM determines that there is a short circuit in the sensor circuit, and stores a DTC.

  • P01201C:

  • This sensor transmits two signals: VTA1 and VTA2. VTA1 is used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. The ECM performs several checks to confirm the proper operation of the throttle position sensor and VTA1.

    For each throttle opening angle, a specific voltage difference is expected between the outputs of VTA1 and VTA2. If the output voltage difference between the two signals deviates from the normal operating range, the ECM interprets this as a malfunction in the throttle position sensor. In this case the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

A198824E61

  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

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

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the GTS on [A].

  6. Start the engine.

  7. With the vehicle stationary, fully depress and release the accelerator pedal [B].

  8. Idle the engine for 2 seconds or more [C].

  9. Enter the following menus: Powertrain / Engine / Trouble Codes [D].

  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 / Utility / All Readiness.

  12. Input the DTC: P012011, P012015, P01201C, P022011, P022015 or P21352B.

  13. Check the DTC judgment result.

    GTS 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
    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 N/A, perform steps [B] through [D] again.

FAIL-SAFE

When any of these DTCs or other DTCs relating to Electronic Throttle Control System (ETCS) 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 8° throttle valve opening 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 angle, to allow the vehicle to continue running 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 turned off.

WIRING DIAGRAM

A282199E22

CAUTION / NOTICE / HINT

Tip:

Read freeze frame data using the GTS. 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. READ VALUE USING GTS (THROTTLE POSITION SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (or start the engine).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / All Data / Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage.

      Powertrain > Engine > Data List

      Tester Display

      Throttle Position Sensor No.1 Voltage

      Throttle Position Sensor No.2 Voltage

    5. Read the values displayed on the GTS.

      Result

      When Accelerator Pedal Fully Released

      When Accelerator Pedal Fully Depressed (Engine Running)

      Trouble Area

      Proceed to

      Throttle Position Sensor No.1 Voltage (VTA1)

      Throttle Position Sensor No.2 Voltage (VTA2)

      Throttle Position Sensor No.1 Voltage (VTA1)

      Throttle Position Sensor No.2 Voltage (VTA2)

      0 to 0.2 V

      0 to 0.2 V

      0 to 0.2 V

      0 to 0.2 V

      VCTA circuit open

      A

      4.5 to 4.98 V

      4.5 to 4.98 V

      4.5 to 4.98 V

      4.5 to 4.98 V

      ETA circuit open

      0 to 0.2 V, or 4.5 to 4.98 V

      2.1 to 3.1 V (Fail-safe)

      0 to 0.2 V, or 4.5 to 4.98 V

      2.1 to 3.1 V (Fail-safe)

      VTA1 circuit open or shorted to ground

      0.6 to 1.4 V (Fail-safe)

      0 to 0.2 V, or 4.5 to 4.98 V

      0.6 to 1.4 V (Fail-safe)

      0 to 0.2 V, or 4.5 to 4.98 V

      VTA2 circuit open or shorted to ground

      0.6 to 1.1 V

      2.1 to 3.1 V

      3.2 to 4.8 V (Not fail-safe)

      4.6 to 4.98 V (Not fail-safe)

      Throttle position sensor circuit normal

      B
      Tip:

      • The throttle actuator does not operate if the accelerator pedal is depressed while the vehicle is stopped with the ignition switch is ON. Therefore, make sure to start the engine before reading the values displayed on the GTS.

      • DTC P01201C is stored when the VTA1 and VTA2 output voltages are not consistent with the sensor characteristics. Therefore, check the freeze frame data when this DTC is stored. Use the following formula to confirm the relative differences in voltage.

        Characteristic Sensor Output

        VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V

        VTA1: Throttle Position Sensor No.1 Voltage

        VTA2: Throttle Position Sensor No.2 Voltage

      • If DTC P01201C is output, proceed to "Check Harness And Connector (Throttle Position Sensor - ECM)".

    B

    CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)Click here

    A

  2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

    1. Disconnect the throttle body with motor assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      B25-5 (VC) - B208-121 (VCTA)

      Always

      Below 1 Ω

      B25-6 (VTA) - B208-122 (VTA1)

      Always

      Below 1 Ω

      B25-4 (VTA2) - B208-88 (VTA2)

      Always

      Below 1 Ω

      B25-3 (E2) - B208-120 (ETA)

      Always

      Below 1 Ω

      B25-5 (VC) or B208-121 (VCTA) - Body ground and other terminals

      Always

      10 kΩ or higher

      B25-6 (VTA) or B208-122 (VTA1) - Body ground and other terminals

      Always

      10 kΩ or higher

      B25-4 (VTA2) or B208-88 (VTA2) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR)

    A194103C96

    *a

    Front view of wire harness connector

    (to Throttle Body with Motor Assembly)

    1. Disconnect the throttle body with motor assembly connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      B25-5 (VC) - B25-3 (E2)

      Ignition switch ON

      4.5 to 5.5 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ECM

    Click hereClick here

    OK

  4. REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY

    1. Replace the throttle body with motor assembly.

      Click here

      Tip:

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS (THROTTLE POSITION SENSOR DTCS)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for at least 30 seconds.

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine / Trouble Codes.

    10. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P012011, P012015, P01201C, P022011, P022015 and/or P21352B are output

      A

      DTCs are not output

      B
    A

    REPLACE ECM

    Click hereClick here

    B

    END