EGR VALVE INSPECTION [MZR-CD (RF Turbo)]

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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.  Disconnect the negative battery cable.

2.  Remove the engine cover.

3.  Disconnect the EGR valve connector.

4.  Measure the resistance between the EGR valve terminals B and F.

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

•  If not within the specification, replace the EGR valve.

Circuit Open/Short Inspection

1.  Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)

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

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Open circuit

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

―  EGR valve terminal B and PCM terminal 8

―  EGR valve terminal F and PCM terminal 7

Short circuit

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

―  EGR valve terminal B and power supply

―  EGR valve terminal B and body ground

―  EGR valve terminal F and power supply

―  EGR valve terminal F and body ground