Ignition System Circuit Diagram (1996-1999 Chevy/GMC Pick Jan 23, 2018$3 USD All of the information you need to diagnose a misfire or a no-start problem (caused by the ignition coil, the ignition module, or the crankshaft position sensor). Diagnostic manual comes with: Wiring diagram. Component pin outs. Connector pin outs. Ignition system component part numbers. Firing order. Complete step-by-step testing Part 3 -How to Test the Ford EGR Valve EGR Vacuum Solenoid Aug 02, 2011Let's get started: With the vacuum pump still connected to the EGR valve. Attach the red multimeter test lead (using an appropriate tool) to the wire labeled with the number 1 in the image viewer that corresponds to the type of DPFE sensor installed on your vehicle.; Connect the black multimeter test lead to a good Ground point on the engine or to the battery negative terminal.