Toyota RAV4 manuals

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

Throttle / Pedal Position Sensor / Switch "A"

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.

Throttle / Pedal Position Sensor / Switch "A"

Throttle / Pedal Position Sensor / Switch "A"

Throttle / Pedal Position Sensor / Switch "A"

HINT:

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

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)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position and turn the intelligent tester on.

(c) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS and THROTTLE POS #2.

(d) Check the values displayed on the tester.

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

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

HINT:

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

CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM)

(a) Disconnect the T2 throttle body connector.

(b) Disconnect the E9 ECM connector.

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

Standard resistance:

(d) Reconnect the throttle body connector.

(e) Reconnect the ECM connector.

3 INSPECT ECM (VC VOLTAGE)

INSPECT ECM (VC VOLTAGE)

(a) Disconnect the T2 throttle body connector.

(b) Turn the ignition switch to the ON position.

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

Standard voltage

(d) Reconnect the throttle with motor body connector.

4 REPLACE THROTTLE BODY

(a) Replace the throttle body (See page ES-493).

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

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch to the ON position and turn the tester on.

(c) Clear the DTCs (See page ES-39).

(d) Start the engine.

(e) Allow the engine to idle for 15 seconds or more.

(f) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

(g) Read the DTCs.

Result

REPLACE ECM (See page ES-498)

Engine Coolant Temperature / Intake Air Temperature Correlation
DESCRIPTION The ECM calculates the difference between the readings of the coolant temperature sensor and intake air temperature sensor. If the difference is greater than 20°C (68°F), the ECM ...

Throttle / Pedal Position Sensor / Switch "A" Circuit Range / Performance Problem
HINT: This DTC relates to the Throttle Position (TP) sensor. DESCRIPTION Refer to DTC P0120 (See page ES-145). MONITOR DESCRIPTION The ECM uses the TP sensor to monitor the throttle valve ...

Other materials:

Abnormal Temperature Inside ID1 Tire
DESCRIPTION Each tire pressure warning valve and transmitter measures the internal temperature of its tire as well as tire pressure, and transmits the information to the tire pressure warning ECU along with the transmitter ID. If the measured temperature is out of the specified range, t ...

Installation
HINT: Install the RH side by the same procedure as the LH side. 1. INSTALL FRONT DISC BRAKE CYLINDER SLIDE BUSH (a) Apply the lithium soap base glycol grease to a new front disc brake cylinder slide bush. (b) Install the cylinder slide bush to the bottom side of the front disc brake cyli ...

Security Indicator Light Circuit
DESCRIPTION Even when the theft deterrent system is in the disarmed state, the security indicator blinks due to a signal output from the immobiliser system. The security indicator blinks continuously due to a continuous signal received from the immobiliser system while in the armed state. ...

© 2011-2019 Copyright www.tsienna.net