EGR Valve: Testing and Inspection

EGR VALVE INSPECTION [L3]

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 EGR valve connector. Service and Repair

2. 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. Service and Repair
Standard





Circuit Open/Short Inspection

1. Disconnect the PCM connector. Service and Repair

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 2BA
- EGR valve terminal B and PCM terminal 2AT
- EGR valve terminal C and main relay terminal C
- EGR valve terminal D and main relay terminal C
- EGR valve terminal E and PCM terminal 2AX
- EGR valve terminal F and PCM terminal 2AW

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