B4000 Regular Cab 4WD V6-4.0L OHV (1997)
Exhaust Pressure Regulator Vacuum Valve: Description and Operation
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If the EGR vacuum regulator solenoid or circuit has an open or short, Diagnostic Trouble Code No. P1409 is output.
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If the circuit is open, no driveability symptom will be noticed.
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If the circuit is shorted, the EGR valve will remain open, causing engine stalling and hard starting.
