Hello, sorry for the delay. My last response got erased by accident. Here is a wiring diagram of the ignition switch. As you can see the 20amp IGN fuse and the 10amp PCM/IGN fuse are on a shared circuit along with the 10amp Alarm fuse which you said had power. These fuses are all under the dash to the left on the drivers side fuse box. They are all fed by the Pink wire coming out of the ignition switch. Check this pink wire at the ignition switch for power with the key in the Start and Run position. If you don't have any power (12Volts) then the ignition switch is bad (but since you said you have power at the Alarm fuse, there should be power there). If there is power running on the Pink wire down to the fuse box, then you need to check out the box itself for any corrosion or damage on the back side of it. The IGN fuse runs to the ignition control module and the PCM/IGN fuse runs to the PCM. This would explain your no spark or fuel pump relay power. You can see on the diagram how the Alarm, IGN and PCM/IGN all share that power circuit in the fuse box. The PCM/IGN fuse power comes out of the fuse box on a Pink/White wire that changes to just a Pink wire and runs to Pin#19 at the PCM. So check the pink wire coming out at the ignition switch first for 12volts and make sure its getting down to that inside fuse box, the check the box next. My cavalier had a bad ignition switch causing a no start like this, and also the plug for the ignition switch is on the opposite side of the steering column then the key/tumbler assembly.
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Thursday, September 29th, 2016 AT 4:18 AM