What is the purpose of the PCM Diode located in the underhood fuse box. How can you tell if its good. I know it sends the voltage for the secondary air injection pump

Asked by Jun 03, 2015 at 10:01 PM about the 2000 Lincoln LS V6

Question type: Maintenance & Repair

Im only getting 2.81 volts to my Air Pump and thats what im getting when the pcm diode
is in its place. I would like to know what role it plays for making my air pump work.2000
Lincoln LS V6

1 Answer

your only going to get minimal voltage until the solid state relay boost it up to 12. so if your only getting minimal voltage check the solid state relay for yur problem

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