FUEL SYSTEM (DFI) 3-61

Subthrottle Sensor (Service Code 32)

Subthrottle Sensor Removal/Adjustment

CAUTION

Do not remove or adjust the subthrottle 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.

Subthrottle Sensor Connector (black) [B]

Input Voltage Inspection

NOTE

•Turn the ignition switch OFF.

•Disconnect the subthrottle sensor (black) [A] and connect

•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.○Be sure the battery is fully charged.

•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] ←→ Subthrottle 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).

3-62 FUEL SYSTEM (DFI)

Subthrottle Sensor (Service Code 32)

Output• Voltage Inspection

Remove the throttle body assy (see Throttle Body Assy

•Removal).

Measure the output voltage at the subthrottle sensor in the same way as input voltage inspection. Note the fol-

•lowing.

Disconnect the subthrottle sensor (black) [A] and (black) connect the harness adapter [B] between these connectors.

•Measure the output voltage of the sensor with the engine

•stopped, and with the connector joined.

•Turn the ignition switch ON.

Measure the output voltage when the subthrottle valve is fully opened or completely closed by hand.

Main Throttle Sensor Output Voltage Connections to Adapter

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

Standard :

0.48 0.52 V DC (at idle throttle opening)

3.6 3.8 V DC (at full throttle opening)

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

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

Wiring Connection

ECU Connector [A] ←→ Subthrottle Sensor Connector [B]

BR lead (ECU terminal 3) BR/BK lead (ECU terminal 14)

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