Exhaust Gas Recirculation: Testing and Inspection

SYSTEM INSPECTION




1. Connect the special service tool (SST) new generation star tester (NGS).
2. Start the engine and let it idle.
3. Select the SIMULATION TEST function on the NGS display.
4. Increase the duty value of the EGR solenoid valve (vacuum) from 0% to 100% by using the "EGRVAC". Operate the EGR solenoid valve (vacuum) and check if the engine speed becomes unstable or the engine stalls.
5. If the engine speed will not change, stop the engine and do as follows.
(1) Turn the ignition switch to ON.
(2) Increase the duty value of the EGR solenoid valve (vacuum) from 0% to 100% by using the "EGRVAC". Operate the EGR solenoid valve (vacuum) and check if operation sound of the solenoid valve is heard.
I. If the operation sound is heard, check the following.
- Loose or damaged vacuum hose
- EGR valve
- EGR solenoid valve (vent)
II. If the operation sound is not heard, check the following.
- EGR solenoid valve (vacuum)
- Wiring between EGR solenoid valve (vacuum) and ECM terminal 4K.