6000 V6-173 2.8L VIN Z 2-bbl HP (1984)
EGR Vacuum Solenoid Valve: Technical Service Bulletins
EGR Vacuum Control - Code 53 Set
Number 84-6 (Gasoline)-13
Date 11/83
Subject:
CODE 53, EXHAUST GAS RECIRCULATION (EGR) VACUUM CONTROL - 1984 CCC EQUIPPED VEHICLES
The EGR Vacuum Control is an ECM controlled solenoid that pulses ported manifold vacuum to the EGR valve. The ECM controls the EGR vacuum by
completing the ground to energize a normally closed solenoid. The EGR is "pulse width modulated"; that is the ECM varies the amount of EGR by the
amount of time the solenoid is "ON" or "OFF". Part of the control includes a Vacuum Diagnostic Control Switch. Its purpose is to signal the ECM when
vacuum is actually being applied to the EGR valve. The EGR vacuum diagnostic control switch is serviced separately.
1984 CCCTROUBLE CODE 53 EGR VACUUM CONTROL CHART
Code 53 will be set if the EGR diagnostic switch senses vacuum when the ECM signals no EGR or does not sense vacuum when the ECM signals for
EGR. It is a normally open switch which is closed by vacuum. When the switch closes, the ECM senses that EGR (vacuum) is applied.
