Toyota RAV4 manuals

Toyota Sienna Service Manual: Throttle / Pedal Position Sensor / Switch "A/B" Circuit

Toyota Sienna Service Manual / 2GR-FE Engine control system / SFI system / Diagnostic trouble code chart / Throttle / Pedal Position Sensor / Switch "A/B" Circuit

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

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

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

The Throttle Position (TP) sensor is mounted on the throttle body, 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 as well as very low speeds.

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 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

DESCRIPTION

DTC No.

DTC Detection Condition

Trouble Area

P0120 Output voltage of VTA1 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic)
  • Throttle Position (TP) sensor (built into throttle body)
  •  ECM
P0122 Output voltage of VTA1 is 0.2 V or less for 2 seconds (1 trip detection logic)
  • TP sensor (built into throttle body)
  •  Short in VTA1 circuit
  •  Open in VC circuit
  •  ECM
P0123 Output voltage of VTA1 is 4.535 V or more for 2 seconds (1 trip detection logic)
  • TP sensor (built into throttle body)
  •  Open in VTA1 circuit
  •  Open in E2 circuit
  •  Short between VC and VTA1 circuits
  •  ECM
P0220 Output voltage of VTA2 quickly fluctuates beyond lower and upper malfunction thresholds for 2 seconds (1 trip detection logic)
  • TP sensor (built into throttle body)
  •  ECM
P0222 Output voltage of VTA2 is 1.75 V or less for 2 seconds (1 trip detection logic)
  • TP sensor (built into throttle body)
  • Short in VTA2 circuit
  • Open in VC circuit
  • ECM
P0223 Output voltage of VTA2 is 4.8 V or more, and VTA1 is between 0.2 V and 2.02 V, for 2 seconds (1 trip detection logic)
  • TP sensor (built into throttle body)
  • Open in VTA2 circuit
  • Open in E2 circuit
  • Short between VC and VTA2 circuits
  • ECM
P2135 Either condition (a) or (b) is met (1 trip detection logic):
  1.  Difference between output voltages of VTA1 and VTA2 is 0.02 V or less for 0.5 seconds or more
  2.  Output voltage of VTA1 is 0.2 V or less, and VTA2 is 0.5 V or less, for 0.4 seconds or more
  • Short between VTA1 and VTA2 circuits
  • TP sensor (built into throttle body)
  • ECM

HINT:

Reference (Normal Condition)

Reference (Normal Condition)

MONITOR DESCRIPTION

The ECM uses the Throttle Position (TP) sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the TP sensor.

If the malfunction is not repaired successfully, a DTC is set 2 seconds after the engine is next started.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

P0120:

TYPICAL MALFUNCTION THRESHOLDS

P0122:

TYPICAL MALFUNCTION THRESHOLDS

P0123:

TYPICAL MALFUNCTION THRESHOLDS

P0220:

TYPICAL MALFUNCTION THRESHOLDS

P0222:

TYPICAL MALFUNCTION THRESHOLDS

P0223:

TYPICAL MALFUNCTION THRESHOLDS

P2135:

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

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 6.5 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 slowly, 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

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1 READ VALUE OF INTELLIGENT TESTER (THROTTLE POS AND THROTTLE POS #2)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position and turn the intelligent tester on.
  3.  Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS and THROTTLE POS #2.
  4.  Check the values displayed on the tester.

Result

Result

Result

HINT:

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

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

  1. Disconnect the T2 throttle body connector.
  2.  Disconnect the E9 ECM connector.
  3.  Measure the resistance according to the value(s) in the table below.

Standard resistance: Check for open

Standard resistance

Check for short

Standard resistance

  1. Reconnect the throttle body connector.
  2.  Reconnect the ECM connector

3 INSPECT ECM (VC VOLTAGE)

INSPECT ECM (VC VOLTAGE)

  1. Disconnect the T2 throttle body connector.
  2.  Turn the ignition switch to the ON position.
  3.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

  1. Reconnect the throttle with motor body connector.

4 REPLACE THROTTLE BODY

  1. Replace the throttle body

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

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position and turn the tester on.
  3.  Clear the DTCs.
  4.  Start the engine.
  5.  Allow the engine to idle for 15 seconds or more.
  6.  Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
  7.  Read the DTCs.

Result

Result

REPLACE ECM

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