2008 - MX-5 - Engine

EGR VALVE INSPECTION [LF]

NOTE:

• Perform the following procedure only when directed.

On-vehicle Inspection

1. Verify that the buzzing sound (valve operation sound) is heard from the EGR valve when engine cranking.

• If the buzzing sound is not heard, perform the resistance inspection.

Resistance Inspection

1. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION [LF].)

2. Disconnect the battery cover.

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

4. Disconnect the EGR valve connector. (See EGR VALVE REMOVAL/INSTALLATION [LF].)

5. Measure the resistance between the EGR valve terminals.

• If within the specification, perform out the “Circuit Open/Short Inspection”.

• If not within the specification, replace the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [LF].)

Standard

Terminal	Resistance (ohm)
C—E C—A D—B D—F	12—16

Circuit Open/Short Inspection

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

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

Open circuit

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

• EGR valve terminal A and PCM terminal 2G

• EGR valve terminal B and PCM terminal 2L

• EGR valve terminal E and PCM terminal 2K

• EGR valve terminal F and PCM terminal 2H

• EGR valve terminal C and main relay

• EGR valve terminal D and main relay

Short circuit

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

• EGR valve terminal A and body ground

• EGR valve terminal A and power supply

• EGR valve terminal B and body ground

• EGR valve terminal B and power supply

• EGR valve terminal C and body ground

• EGR valve terminal D and body ground

• EGR valve terminal E and body ground

• EGR valve terminal E and power supply

• EGR valve terminal F and body ground

• EGR valve terminal F and power supply