Toronado V6-231 3.8L (1986)
Circuit Description:
EGR SYSTEM FAULT
The EGR Vacuum Control is operated by an Electronic Vacuum Regulator Valve (EVRV). The EVRV is comprised of an EGR Vacuum Control
Solenoid and a EGR Diagnostic Vacuum Switch. The EGR Solenoid is Pulse Width Modulated by the ECM and controls the vacuum to the EGR valve.
The Solenoid is vented and is equipped with a filter. The normally open EGR Diagnostic Vacuum Switch monitors the vacuum to the EGR Valve and
signals the ECM when control vacuum is applied to the valve (switch closes). The ECM will not energize the solenoid in "Park", "Neutral", or at idle.
The ECM cycles the EGR valve "ON" and "OFF" (Pulse Width Modulation). For this reason, the EGR valve is never continuously open but always
"pulsed" which may be monitored by observing the ECM input EI60 (EVRV Switch) during normal EGR operation. "HI" indicates the EGR is off and
"LO" indicates it is on. Code E032 will set if the vacuum switch closes at idle, or if it does not close under load (less than WOT).
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Engine running.
