K 3500 Truck 4WD V8-454 7.4L (1994)
Chart Test Description:
Numbers below refer to circled numbers on the diagnostic chart.
1.
Checks to see if a vacuum source is present, along with certain conditions before the purge solenoid is commanded "ON". Also shows a
change of vacuum as purge solenoid is being cycled.
2.
Checks for power to the solenoid, the ground circuit, the connections at the purge solenoid and the solenoid itself.
3.
Checks for open or grounded CKT 439.
4.
Checks for open CKT 428 or faulty control module.