2008 - MX-5 - Engine

THROTTLE BODY INSPECTION [LF]

NOTE:

• Perform the following inspection only when directed.

Resistance Inspection

1. Remove the battery cover.

2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)

3. Disconnect the throttle body connector.

4. Measure the resistance between throttle actuator terminals A and B.

• If not as specified, replace the throttle body. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [LF].)

• If as specified, carry out the “Circuit Open/Short Inspection”.

Specification

Ambient temperature (°C {°F})	Resistance (ohm)
Approx. 20 {68}	0.3—100

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF].)

2. Inspect the following wiring harnesses for open or short (continuity check).

Open circuit

• If there is no continuity, the circuit is open. Repair or replace the wiring harness.

• Throttle valve actuator terminal A and PCM terminal 2B

• Throttle valve actuator terminal B and PCM terminal 2A

Short circuit

• If there is continuity, the circuit is shorted. Repair or replace the wiring harness.

• Throttle valve actuator terminal A and power supply

• Throttle valve actuator terminal A and ground

• Throttle valve actuator terminal B and power supply

• Throttle valve actuator terminal B and ground