FUEL SYSTEM (DFI) 3-93

Subthrottle Valve Actuator (Service Code 62)

Subthrottle Valve Actuator Removal

CAUTION

Do not remove the subthrottle valve actuator [A] since it has been adjusted and set with precision at the factory.

Never drop the throttle body assy especially on a hard surface. Such a shock to the subthrottle valve actuator can damage it.

Subthrottle Valve Actuator Inspection

NOTE

○Be sure the battery is fully charged.

•Remove the air cleaner housing (see Air Cleaner Housing Removal).

•Turn the ignition switch ON.

•Check to see that all the subthrottle valves [A] open and close smoothly.

•Turn the ignition switch OFF.

If the subthrottle valves do not operate, check the subthrottle valve actuator resistance (see Subthrottle Valve Actuator Resistance Inspection).

Subthrottle Valve Actuator Resistance Inspection

•Turn the ignition switch OFF.

•Remove the air cleaner housing (see Air Cleaner Housing Removal).

•Disconnect the subthrottle valve actuator connector [A].

•Connect a digital meter to the subthrottle valve actuator connector [A].

•Measure the subthrottle valve actuator resistance.

Subthrottle Valve Actuator Resistance

Connections: Y/R lead [1] ←→ R/Y lead [2]

	W/R lead [3] ←→ R/W lead [4]
Standard:	About 5.2 7.8 Ω

If the reading is out of the standard, replace the throttle body assy (see Throttle Body Assy Removal/Installation). If the reading is within the standard, check the input voltage (see Subthrottle Valve Actuator Input Voltage Inspection).

3-94 FUEL SYSTEM (DFI)

Subthrottle Valve Actuator (Service Code 62)

Subthrottle Valve Actuator Input Voltage

Inspection

NOTE

○Be sure the battery is fully charged.

•Turn the ignition switch OFF.

•Disconnect the subthrottle valve actuator connector and connect the harness adapter [A] between these connectors as shown in the figure.

Main Harness [B]

Subthrottle Valve Actuator [C]

Special Tool - Measuring Adapter: 57001-1700

•Connect the peak voltage adapter [D] and a digital meter [E] to the harness adapter leads.

Special Tool - Peak Voltage Adapter: 57001-1415

Type: KEK-54-9-B

Subthrottle Valve Actuator Input Voltage

Connections to Adapter:

(I)Digital Meter (+) → R (actuator Y/R) lead Digital Meter (–) → BK (actuator R/Y) lead

(II)Digital Meter (+) → W (actuator W/R) lead Digital Meter (–) → Y (actuator R/W) lead

•Measure the actuator input voltage with the engine stopped and with the connector joined.

•Turn the ignition switch ON.

Input Voltage

Standard: About DC 8.5 10.5 V

•Turn the ignition switch OFF.

If the reading is in specification, but the actuator does not operate, replace the throttle body assy (see Throttle Body Assy Removal/Installation).

If the reading is out of the specification, remove the ECU and check the wiring for continuity between main harness connectors.

Special Tool - Hand Tester: 57001-1394

○Disconnect the ECU and actuator connectors.

Wiring Continuity Inspection

ECU Connector [A] ←→

Subthrottle Valve Actuator Connector [B]

R/Y lead (ECU terminal 1) [C]

R/W lead (ECU terminal 2) [D]

Y/R lead (ECU terminal 18) [E]

W/R lead (ECU terminal 19) [F]

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

If the ground and power supply are good, replace the ECU (see ECU Removal/Installation).

FUEL SYSTEM (DFI) 3-95

Subthrottle Valve Actuator (Service Code 62)

Subthrottle Valve Actuator Circuit

1.Subthrottle Valve Actuator

2.ECU