Mazda 6 Service Manual: Egr valve inspection

Mazda 6 Service Manual / Fuel and emission control systems / Emission system / Egr valve inspection

Operation Test

Carry out the EGR Control Inspection. (See EGR Control System Inspection.

If not as specified, perform the further inspection for the EGR valve.

Resistance Inspection

Note

Perform the following test only when directed.

1. Disconnect the negative battery cable.

2. Inspect resistance of the EGR valve coils.

If not as specified, replace the EGR valve.
If as specified, carry out the Circuit Open/Short Inspection.

Circuit Open/Short Inspection

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

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

Open circuit

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

- EGR valve terminal E (harness-side) and PCM terminal 4E

- EGR valve terminal A (harness-side) and PCM terminal 4H

- EGR valve terminal B (harness-side) and PCM terminal 4K

- EGR valve terminal F (harness-side) and PCM terminal 4N

- EGR valve terminal C or D (harness-side) and main relay terminal C (harness-side)

Short circuit

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

- EGR valve terminal E (harness-side) and GND

- EGR valve terminal A (harness-side) and GND

- EGR valve terminal B (harness-side) and GND

- EGR valve terminal F (harness-side) and GND

- EGR valve terminal C or D (harness-side) and power supply

3. Remove the EGR valve, and inspect for any damage or clogging.

If there is no damage or no clogging, replace the EGR valve.

Egr valve removal/installation

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