3-40 FUEL SYSTEM (DFI)

Main Throttle Sensor (Service Code 11)

Main Throttle Sensor Removal/Adjustment

CAUTION

Do not remove or adjust the main throttle sensor [A] since it has been adjusted and set with precision at the factory.

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

Main Throttle Sensor Connector (gray) [B]

Input Voltage Inspection

NOTE

Be sure the battery is fully charged.

•Turn the ignition switch OFF.

•Disconnect the main throttle sensor (gray) [A] and con-

•nect the harness adapter [B] between these connectors. Connect a digital meter to the harness adapter lead.

Special Tool - Throttle Sensor Harness Adapter : 57001–1538

•Measure the sensor input voltage with the engine stopped

•and with the connector joined. Turn the ignition switch ON.○

•Turn the ignition switch OFF.

If the input voltage is normal, check the sensor output voltage.

If the input voltage is less than the standard, remove the ECU and check the wiring between these connectors.

○Disconnect the ECU and sensor connectors.

Wiring Connection

ECU Connector [A] ←→ Throttle Sensor Connector [B] BL lead (ECU terminal 1)

BR/BK lead (ECU terminal 14)

If the wiring is good, check the ECU for its ground and power supply (see ECU section).

FUEL SYSTEM (DFI) 3-41

Main Throttle Sensor (Service Code 11)

Output• Voltage Inspection

Measure the output voltage at the main throttle sensor in the same way as input voltage inspection, Note the

•following.

Disconnect the main throttle sensor (gray) [A] and connect the harness adapter [B] between these connectors.

Special Tool - Throttle Sensor Harness Adapter :

•Start the engine and warm it up thoroughly.

•Check idle speed to ensure the throttle opening is correct.

Idle Speed

Standard: 1 100 ±50 r/min (rpm)

If the idle speed is out of the specified range, adjust it (see Idle Speed Inspection in the Periodic Maintenance

•chapter).

•Turn off the ignition switch.

Measure the output voltage of the sensor with the engine

•stopped, and with the connector joined. Turn the ignition SW ON.57001–1538

Main Throttle Sensor Output Voltage Connections to Adapter

Meter (+) → W (sensor Y/W) lead Meter (–) → BK (sensor BR/BK) lead

Standard :

0.99 1.03 V DC (at idle throttle opening)

4.19 4.39 V DC (at full throttle opening)

If the output voltage is out of the standard, inspect the main throttle sensor resistance.

If the output voltage is normal, check the wiring for continuity.

Wiring Connection

ECU Connector [A] ←→ Throttle Sensor Connector [B] Y/W lead (ECU terminal 2)

BR/BK lead (ECU terminal 14)

If the wiring is good, check the ECU for its ground and power supply (see ECU section).