3-76 FUEL SYSTEM (DFI)

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 throttle body assy especially on a hard surface. Such a shock to the subthrottle sensor can damage it.

Subthrottle Sensor Input Voltage Inspection

NOTE

○Be sure the battery is fully charged.

•Turn the ignition switch OFF.

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

•Disconnect the subthrottle sensor connector and connect the harness adapter [A] between these connectors.

Special Tool - Throttle Sensor Setting Adapter: 57001 -1538

•Connect a digital meter to the harness adapter leads.

Subthrottle Sensor Input Voltage Connections to Adapter:

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

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

•Turn the ignition switch ON.

Input Voltage

Standard: DC 4.75 5.25 V

•Turn the ignition switch OFF.

If the reading is within the standard, check the output voltage (see Subthrottle Sensor Output Voltage Inspection).

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

Special Tool - Hand Tester: 57001-1394

○Disconnect the ECU and sensor connectors.

Wiring Continuity Inspection

ECU Connector [A] ←→

Subthrottle Sensor Connector [B]

BL lead (ECU terminal 10) [C]

BR/BK lead (ECU terminal 28) [D]

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) 3-77

Subthrottle Sensor (Service Code 32)

Subthrottle Sensor Output Voltage Inspection

•Measure the output voltage at the subthrottle sensor in the same way as input voltage inspection, note the following.

○Disconnect the subthrottle sensor connector and connect the harness adapter [A] between these connectors.

Special Tool - Throttle Sensor Setting Adapter: 57001

-1538

Subthrottle Sensor Output Voltage

Connections to Adapter:

Digital Meter (+) → R (sensor BR) lead

Digital Meter (–) → BK (sensor BR/BK) lead

•Disconnect the subthrottle valve actuator connector [A].

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

•Turn the ignition switch ON.

•Measure the output voltage when the subthrottle valves are fully opened by hand.

Output Voltage

Standard: DC 1.08 1.12 V at subthrottle valve full close position

DC 4.48 4.52 V at subthrottle valve full open position (for reference)

NOTE

○Close the subthrottle valves, confirm the output voltage will be lower.

○The standard voltage refers to the value when the voltage reading at the Input Voltage Inspection shows 5 V exactly.

○When the input voltage reading shows other than 5 V, derive a voltage range as follows.

Example:

In the case of a input voltage of 4.75 V. 1.08 × 4.75 ÷ 5.00 = 1.026 V

1.12 × 4.75 ÷ 5.00 = 1.064 V

Thus, the valid range is 1.026 1.064 V

•Turn the ignition switch OFF.

If the reading is out of the standard, check the subthrottle sensor resistance (see Subthrottle Sensor Resistance Inspection).

3-78 FUEL SYSTEM (DFI)

Subthrottle Sensor (Service Code 32)

If the reading is within the standard, remove the ECU and check the wiring for continuity between main harness connectors.

Special Tool - Hand Tester: 57001-1394

○Disconnect the ECU and sensor connectors.

Wiring Continuity Inspection

ECU Connector [A] ←→

Subthrottle Sensor Connector [B]

BR lead (ECU terminal 24) [C]

BR/BK lead (ECU terminal 28) [D]

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).

Subthrottle Sensor Resistance Inspection

•Turn the ignition switch OFF.

•Disconnect the subthrottle sensor connector.

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

•Measure the subthrottle sensor resistance.

Subthrottle Sensor Resistance

Connections: BL lead [C] ←→ BR/BK lead [D]

Standard:

4 6 kΩ

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, but the problem still exists, replace the ECU (see ECU Removal/Installation).

Subthrottle Sensor Circuit

1.Subthrottle Sensor

2.ECU