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Old 09-09-2021, 08:25 PM   #4
fdryer
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Join Date: Jan 2006
Location: NYC
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2003 L-Series 3.0L Sedan
Default Re: 2002 Saturn SC1 coupe has security issue

There may be several problems here. At the least, seeing security blink 5x is unusual. Service manuals are my reference for GMs Passlock program and as accurate as I can describe it if not reprinting parts of it throughput the years here.

Acc(essory) position does not enable fuel pump operation. When the ign switch is turned to the ON/RUN position, this powers up all electronics with the pcm initially going thru its own power-up self tests then sending a fuel signal to the pump relay to run it for several seconds. If the ign switch isn't turned to START, the pcm turns off pump operation. If ign switch is turned to START, the starting circuit is enabled to power up the starter to crank the engine. During starting, the pcm relies on the crank sensor to provide precise timing signals (pulse train) to allow the pcm to turn on fuel pump, initiate timing for spark, and pulse injectors. Under normal everyday situations, the engine starts up and car driven. Damaging the ignition switch/lock cylinder/Passlock sensors presents several issues.

If we can presume Passlock isn't interfering with starting the engine with the security indicator always on, the nexts steps are to test for spark and fuel. Even after replacing the spark plugs and still no start, remove plugs again for two reasons; checking for fuel then checking for spark. Did you try suggestions given previously? Fuel should be injected with raw fuel smell on plugs to verify injector operation. Depressing the fuel test valve on the fuel rail should emit a strong spray of fuel too after ignition is turned on as fuel pressure should remain high whether or not starting occurs. A fuel pressure gauge connected to the test valve should display between 39-50 psi. Test for spark as suggested.
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