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Old 09-26-2017, 12:26 AM   #10
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,601
 

2003 L-Series 3.0L Sedan
Default Re: hard starting 2001 SL1

^ Correct. At ignition on time, engine off, the PCM program sends a two second command to the pump relay to run the pump then shuts off pumping. When the starter engages and turns over the engine, crank sensor signals are sent to the pcm to allow it to run the EFI system: turn on fuel pump, initiate the ignition system for spark and pulse injectors. The same signal from the pcm is used in two situations to power the pump relay that sends 12v power to the pump.

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