#
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.

  • If within the specification, perform the "Circuit Open/Short Inspection".
  • If not within the specification, replace the EGR valve.

EGR valve (DC motor) resistance

  1.7-3.2 ohms

## 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).

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