Main Throttle Sensor (Service Code 11)

Output Voltage Inspection

• Measure the output voltage at the ECU in the same way as input voltage inspection. Note the following.

Digital Voltmeter [A]

Connector [B]

Special Tool - Needle Adapter Set: 57001-1457

Main Throttle Sensor Output Voltage Connections to ECU Meter (+) -> Y/W lead (terminal 2)

Meter (-) -> BR/BK lead (terminal 14)

• Start the engine and warm it up thoroughly.

• Check idle speed to ensure throttle opening is correct.

Idle Speed

Standard: 1 300 r/min (rpm)

• If the idle speed is out of the specified range, adjust the idle speed (see Idle Speed Inspection in Periodic Mainte- nance chapter).

• Turn the ignition switch OFF.

• Measure the output voltage with the engine stopped, and with the connector joined.

• Turn the ignition switch ON.

• Measure the output voltage when the throttle is fully opened or completely closed.

Output Voltage at ECU

Standard: 1.02 - 4.62 V DC (at idle throttle opening

to full throttle opening)

NOTE

o The throttle sensor is operating correctly if the following voltages are obtained:

•1.02 VDC (or slightly higher) with the throttle at the idle position.

• 4.62 VDC (or slightly lower) with the throttle at the fully open position.

CAUTION ~

Do not remove or adjust the main throttle sensor.

It has been adjusted and set with precision at the factory.

Never drop the sensor can especially on a hard sur­face. A shock to the sensor can damage it. ^{* •}

• If the output voltage is within the standard range, check the ECU for a good ground, and power supply (see this chapter). If the ground and power supply are good, re­place the ECU.

• If the output voltage is far out of the standard range (e.g. when the wiring is open, the reading is 0 V), check the output voltage again at the sensor connector.

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Main Throttle Sensor (Service Code 11)

• Disconnect the main throttle sensor connector [A] and connect the harness adapter [B] between the harness connector and main throttle sensor connector.

• Connect a digital meter to the harness adapter leads. Special Tool - Throttle Sensor Harness Adapter :

57001-1538

Throttle Sensor Output Voltage Connections to Sensor Meter (+) -> Y/W lead Meter (-) -> BR/BK lead

• Measure the sensor output voltage with the engine stopped, and with the connector joined.

• Turn the ignition switch ON.

• Measure the output voltage when the throttle is fully opened or completely closed.

Output Voltage at Sensor

Standard: 1.02 - 4.62 V DC (at idle throttle

opening to full throttle opening)

NOTE

O The throttle sensor is operating correctly if the following voltages are obtained:

• 1.02 VDC (or slightly higher) with the throttle at the idle position.

• 4.62 VDC (or slightly lower) with the throttle at the fully open position.

CAUTION

Do not remove or adjust the main throttle sensor. It has been adjusted and set with precision at the factory.

Never drop the sensor, especially on a hard surface. A shock to the sensor can damage it.

NOTE

O The standard voltage marked with an asterisk refers to the value when the voltage reading at the Input Voltage Inspection shows 5V exactly. o When the input voltage reading shows other than 5V, derive a voltage range as follows.

Example:

In the case of a input voltage of 4.75 V.

1.02 x 4.75 + 5.00 = 0.97 V 4.62 * 4.75 + 5.00 = 4.39 V Thus, the valid range is 0.97 - 4.39 V

• After throttle sensor voltage inspection, remove the har­ness adapter.

• If the reading is out of the standard range, inspect the throttle sensor resistance.

• If the output voltage is normal, check the wiring for conti­nuity (see next diagram).

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Main Throttle Sensor (Service Code 11)

Resistance Inspection

• Turn the ignition switch OFF.

• Disconnect the main throttle sensor connector.

• Connect a digital meter [A] to the main throttle sensor connector [B].

• Measure the main throttle sensor resistance.

Main Throttle Sensor Resistance

Connections: BL lead [C] <—> BR/BK lead [D]

Standard: 4 - 6 kfi

• If the reading is out of the range, replace the throttle body assy.

• If the reading is within the range, but the problem still exists, replace the ECU (see this chapter).

2. Subthrottle Valve Actuator

3. Subthrottle Sensor

4. Main Throttle Sensor

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Inlet Air Pressure Sensor (Service Code 12)

CAUTION

Never drop the sensor, especially on a hard surface. Such a shock to the part can damage it.

Removal

• Turn the ignition switch off.

• Remove:

Air Cleaner Housing (see Air Cleaner Housing Removal) Inlet Air Pressure Sensor Connector [A]

Inlet Air Pressure Sensor Screw [B]

Inlet Air Pressure Sensor [C]

Vacuum Hose [D]

Installation

NOTE

O The inlet air pressure sensor is the same part as the at­mospheric sensor except that the sensor has a vacuum hose and different wiring.

• Install:

Vacuum Hose [A]

Inlet Air Pressure Sensor [B]

Torque-Inlet Air Pressure Sensor Screw: 4.9 N-m (0.50 kgf-m, 43 in-lb)

[C] Vacuum Hoses

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