EGR Vacuum Solenoid Valve Testing and Inspection for Diesel Electronic Control System
Fig. 030 - WIRING DIAGRAM for Chart C-3 EGR Solenoid Check. VIN N, VIN T
CHART C-3
EGR SOLENOID CHECK
(FROM CODE 53 EGR CONTROL ERROR)
4.3L VIN "T"
5.7L VIN "N"
The EGR solenoid controls vacuum to the EGR valve. The signal from the ECM is Pulse Width Modulated (PWM), which changes the cycle ("ON"
time) from 0% to 100%. As the EGR solenoid cycles, control vacuum to the EGR valve is metered. The solenoid operates on 12V, supplied by the
ignition to the solenoid. The ground is completed by the ECM to turn the solenoid "ON", allowing vacuum to the EGR valve. A vacuum error will set
Code 53 and could be the result of a faulty EGR solenoid. When a vacuum error is sensed by the ECM, EGR is turned "OFF". It takes approximately 10
seconds for the ECM to sense a vacuum error, and the CEL will not go "OFF" until the key is turned "OFF".
