Input Devices

Vehicles are equipped with different combinations of input devices. Not all devices are used on all models. Available input signals include the following:

Accelerator Pedal Position Sensor (Land Cruiser, 2001 MR2 With Sequential Manual Transaxle, Sequoia, Tundra 4.7L

2001 ENGINE PERFORMANCE Theory & Operation

V8 & 4Runner)

Accelerator pedal position sensor is used with Electronic Throttle Control System (ETCS) for controlling of throttle operation. See ELECTRONIC THROTTLE CONTROL SYSTEM under AIR INDUCTION SYSTEMS for additional information.

Accelerator Pedal Position Sensor (Prius)

Accelerator pedal position sensor converts accelerator pedal angle into an electrical signal and delivers output signal to Hybrid Vehicle (HV) control Electronic Control Unit (ECU). Hybrid vehicle control ECU is referred to as HV ECU. The HV ECU communicates with the ECM for controlling the Electronic Throttle Control System (ETCS) for throttle operation. See ELECTRONIC THROTTLE CONTROL SYSTEM under AIR INDUCTION SYSTEMS for additional information.

A/C Compressor Lock Sensor (Camry 2.2L 4-Cyl. CNG Models, Camry 2.2L 4-Cyl. Gasoline Models With Manual A/C, Camry Solara 2.2L 4-Cyl. With Manual A/C, Celica, Highlander, MR2 & RAV4)

A/C compressor lock sensor delivers a one pulse input signal per engine revolution to ECM. If number ratio of A/C compressor speed divided by engine speed is smaller than a predetermined value, ECM will turn off A/C compressor. A/C lock sensor is located near front of A/C compressor.

A/C Evaporator Temperature Sensor (Camry 2.2L 4-Cyl. CNG Models, Camry 2.2L 4-Cyl. Gasoline Models With Manual A/C & Camry Solara 2.2L 4-Cyl. With Manual A/C)

A/C evaporator temperature sensor detects temperature inside A/C cooling unit and delivers input signal to Engine Control Module (ECM). A/C evaporator temperature sensor is located inside A/C cooling unit, near A/C evaporator core.

A/C Switch (Avalon, Camry, Camry Solara, Celica, Corolla, ECHO, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra & 4Runner)

When A/C is turned on, input signal is delivered to Engine Control Module (ECM). ECM may use input signal for controlling engine operation. Input signal may be delivered from A/C switch, A/C amplifier, A/C control assembly or A/C clutch depending on model application.

Air/Fuel Sensor (Avalon, Camry 2.2L 4-Cyl. CNG & Gasoline Models, Camry 3.0L V6 With A/T, Camry Solara 2.2L 4-Cyl., Camry Solara 3.0L V6 With A/T, Highlander, RAV4, Sienna, Tacoma, Tundra 3.4L V6 & 4Runner)

Air Fuel (A/F) sensor may also be referred to as A/F ratio sensor. Heated A/F sensor monitors exhaust gas oxygen content and delivers an input signal to Engine Control Module (ECM). ECM may use input signal to control fuel injection system. For A/F sensor location, see A/F SENSOR LOCATION table.

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