What does the Check Engine light on EGR mean?
Check Engine Light comes on. Another symptom of a potential problem with the EGR vacuum modulator is an illuminated Check Engine Light. If the computer detects a problem with the EGR vacuum modulator signal or circuit it will set off the Check Engine Light to alert the driver of an issue.
How to check for vacuum at the EGR valve?
If you have a scan tool capable of controlling actuators or pids you can command the EVR on and check for vacuum at the EGR valve as the regulator opens. If you do not notice vacuum at the EGR valve as the EVR is commanded on and you do have supply vacuum at the EVR connector then check the EVR,…
What happens when the EGR control solenoid is activated?
When the EGR control solenoid is activated, a passage is opened up that allows exhaust gases into the intake manifold. The EGR solenoid is controlled by the engine computer, and activated at very specific times in order to achieve the best performance, efficiency, and emissions from the engine.
How is exhaust gas circulated in an EGR system?
Most EGR systems have a by-pass valve integrated with the EGR cooler. When the engine is cold, the exhaust gas is circulated directly into the engine.
What’s the code for an EGR valve throw?
What code will an EGR valve throw have? The P0401 trouble code is related to your car’s exhaust gas recirculation (EGR) system, which controls an engine and reduces emissions. Suppose a computer-controlled valve gives a certain amount of gases back into your engine to be burnt with the air-fuel mixture.
What are the signs of an EGR problem?
Common signs include engine performance issues, the Check Engine Light coming on, and failing an emissions test. 1. Engine performance issues 2. Check Engine Light comes on 3. Failed emissions test The EGR vacuum modulator is a component found on some EGR systems.
What happens to the EGR when the vacuum is high?
When the vacuum is high, combustion temperatures and airflow are naturally lower so the diaphragm will close and restrict flow, when vacuum is low airflow and combustion temperatures are higher, so EGR flow must be increased. For vehicles equipped with them, the EGR vacuum modulator is one of the most important components of the EGR system.
How to check check engine light on Saturn?
Saturn Check Engine Light Codes 1 Connect scan tool to the 16-pin data link connector (DLC) located underneath the steering column. The connector may have a removable cover. 2 Turn the ignition on. 3 Follow scan tool manufacturer’s operating instructions to access the Diagnostic Trouble Codes (DTC’s).