Sfi System - P2135

Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Fail-safe

  3. Wiring diagram

  4. Inspection procedure

  5. Read value using intelligent tester (throttle position no. 1 and throttle position no. 2)

  6. Check harness and connector (throttle position sensor - ecm)

  7. Inspect ecm (vc voltage)

  8. Replace throttle body assembly

  9. Check whether dtc output recurs (throttle position sensor dtcs)

DTC P0120 Throttle / Pedal Position Sensor / Switch "A" Circuit Malfunction

DTC P0121 Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem

DTC P0122 Throttle / Pedal Position Sensor / Switch "A" Circuit Low Input

DTC P0123 Throttle / Pedal Position Sensor / Switch "A" Circuit High Input

DTC P0220 Throttle / Pedal Position Sensor / Switch "B" Circuit

DTC P0222 Throttle / Pedal Position Sensor / Switch "B" Circuit Low Input

DTC P0223 Throttle / Pedal Position Sensor / Switch "B" Circuit High Input

DTC P2135 Throttle / Pedal Position Sensor / Switch "A" / "B" Voltage Correlation

HINT:
These DTCs relate to the Throttle Position (TP) sensor.

DESCRIPTION

The Throttle Position (TP) sensor is mounted on the throttle body assembly, and detects the opening angle of the throttle valve. This sensor is a non-contact type, and uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds and very low speeds.
The TP sensor has two sensor circuits which each transmit 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 in proportion to the throttle valve opening angle, and are transmitted to the VTA 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.

Throttle Position (TP) sensor (built into throttle body assembly) Yaris


DTC No.
DTC Detection Conditions
Trouble Areas
P0120
Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. Throttle Position (TP) sensor (built into throttle body assembly)
  2. ECM
P0121
Difference between VTA1 and VTA2 voltages less than 0.8 V, or more than 1.6 V for 2 seconds
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  2. TP sensor circuit
  3. ECM
P0122
Output voltage of VTA1 0.2 V or less for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  2. Short in VTA1 circuit
  3. Open in VC circuit
  4. ECM
P0123
Output voltage of VTA1 4.535 V or more for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  2. Open in VTA1 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA1 circuit
  5. ECM
P0220
Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  2. ECM
P0222
Output voltage of VTA2 1.75 V or less for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  2. Short in VTA2 circuit
  3. Open in VC circuit
  4. ECM
P0223
Output voltage of VTA2 4.8 V or more, and VTA1 between 0.2 V and 2.02 V, for 2 seconds when accelerator pedal depressed
(1 trip detection logic)
  1. TP sensor (built into throttle body assembly)
  2. Open in VTA2 circuit
  3. Open in E2 circuit
  4. Short between VC and VTA2 circuit
  5. ECM
P2135
Either condition (a) or (b) met (1 trip detection logic):
(a) Difference between output voltages of VTA1 and VTA2 0.02 V or less for 0.5 seconds or more
(b) Output voltage of VTA1 0.2 V or less, and VTA2 1.75 V or less, for 0.4 seconds or more
  1. Short between VTA1 and VTA2 circuit
  2. TP sensor (built into throttle body assembly)
  3. ECM
HINT:
  1. When any of these DTCs are set, check the throttle valve opening angle by selecting the following menu items on an intelligent tester: Powertrain / Engine and ECT / Data List / Throttle Position No. 1 and Throttle Position No. 2.
  2. Throttle Position No. 1 denotes the VTA1 signal, and Throttle Position No. 2 denotes the VTA2 signal.

    Reference (Normal Condition):

    Tester Display
    		Accelerator Pedal Fully Released
    		Accelerator Pedal Fully Depressed
    Throttle Position No. 1
    		0.5 to 1.1 V
    		3.2 to 4.8 V
    Throttle Position No. 2
    		2.1 to 3.1 V
    		4.6 to 5.0 V

FAIL-SAFE

When any of these DTCs, as well as other DTCs relating to ETCS (Electronic Throttle Control System) malfunctions, are set, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° 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


Connect an intelligent tester to the DLC3. Yaris


INSPECTION PROCEDURE

HINT:
Read freeze frame data using an intelligent tester. Freeze frame data record 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.
1.READ VALUE USING INTELLIGENT TESTER (THROTTLE POSITION NO. 1 AND THROTTLE POSITION NO. 2)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Throttle Position No. 1 and Throttle Position No. 2.

  1. Read the values displayed on the tester.

    Result:

    TP No. 1 (VTA1)
    When Accelerator pedal Released
    		TP No. 2 (VTA2)
    When Accelerator pedal Released
    		TP No. 1 (VTA1)
    When Accelerator pedal Depressed
    		TP No. 2 (VTA2)
    When Accelerator pedal Depressed
    		Trouble Areas
    		Proceed To
    0 to 0.2 V
    		0 to 0.2 V
    		0 to 0.2 V
    		0 to 0.2 V
    		VC circuit open
    		A
    4.5 to 5.0 V
    		4.5 to 5.0 V
    		4.5 to 5.0 V
    		4.5 to 5.0 V
    		E2 circuit open
    0 to 0.2 V,
    or 4.5 to 5.0 V
    		2.1 to 3.1 V
    (Fail-safe)
    		0 to 0.2 V,
    or 4.5 to 5.0 V
    		2.1 to 3.1 V
    (Fail-safe)
    		VTA1 circuit open or ground short
    0.6 to 1.4 V
    (Fail-safe)
    		0 to 0.2 V,
    or 4.5 to 5.0 V
    		0.6 to 1.4 V
    (Fail-safe)
    		0 to 0.2 V,
    or 4.5 to 5.0 V
    		VTA2 circuit open or ground short
    0.5 to 1.1 V
    		2.1 to 3.1 V
    		3.2 to 4.8 V
    (Not fail-safe)
    		4.6 to 5.0 V
    (Not fail-safe)
    		TP sensor circuit normal
    		B
HINT:
  1. TP No. 1 denotes Throttle Position No. 1, and TP No. 2 denotes Throttle Position No. 2.
  2. DTC P0121 is stored when the voltages output from VTA1 and VTA2 are not consistent with the characteristics of the sensors. Therefore, check the Freeze Frame Data when this DTC is output. Use the following formula to confirm relative fluctuations in voltage.
    Features of sensor output:
    VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V
    VTA1: Throttle Position No. 1.
    VTA2: Throttle Position No. 2.
  3. If DTC P0121 is output, proceed to "CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)".


Bnext
Go to step 5
A
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2.CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)
Disconnect the C17 throttle body connector. Yaris

  1. Disconnect the C17 throttle body connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    VC (C17-5) - VCTA (C20-67)
    		Below 1 Ω
    VTA (C17-6) - VTA1 (C20-115)
    VTA2 (C17-4) - VTA2 (C20-114)
    E2 (C17-3) - ETA (C20-91)
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    VC (C17-5) or VCTA (C20-67) - Body ground
    		10 kΩ or higher
    VTA (C17-6) or VTA1 (C20-115) - Body ground
    VTA2 (C17-4) or VTA2 (C20-114) - Body ground

  1. Reconnect the throttle body connector.

  1. Reconnect the ECM connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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3.INSPECT ECM (VC VOLTAGE)
Disconnect the C17 throttle body connector. Yaris

  1. Disconnect the C17 throttle body connector.

  1. Turn the ignition switch to ON.

  1. Measure the voltage between the terminals of the throttle body connector.

    Standard voltage:
    Tester Connections
    		Specified Conditions
    VC (C17-5) - E2 (C17-3)
    		4.5 to 5.5 V

  1. Reconnect the throttle body connector.



NGnext
REPLACE ECM (Click here)
OK
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4.REPLACE THROTTLE BODY ASSEMBLY

  1. Replace the throttle body assembly (Click here).


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

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear DTCs (Click here).

  1. Start the engine.

  1. Allow the engine to idle for 15 seconds or more.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed To
    P0120, P0121, P0122, P0123, P0220, P0222, P0223, and/or P2135
    		A
    No output
    		B


Bnext
SYSTEM OK
A
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REPLACE ECM (Click here)