2003 focus, ztec. PCM draw

Asked by Jul 01, 2013 at 10:23 PM about the 2003 Ford Focus ZX5

Question type: Maintenance & Repair

2003 focus, ztec. new alt. new batt. parasitic draw when the pcm fuse in place. draw goes away when the fuse is removed. tried 'soaking', unplugged all relays and fuses, draw still there. removed gem module, draw still there. nothing aftermarket on the car.  help?

4 Answers

...well let's look at what the PCM is connected to---will have to pull up an electrical diagram~

2 of 2 people found this helpful.
71,645

All PCMs, BCMs, EBCMs draw power from the battery all of the time. Even when you turn off the ignition. But, if you frequently use the car and it's killing the battery. Then you've got a problem. On the other hand, if the car sits for extended periods, say more than 2 weeks. A dead battery can be expected. Disconnect the negative (-) battery cable when you plan on not using it. HTH. -Jim

all I could get into was functional 'block' diagrams which will tell us nothing~

if you could bother to get the diagnostics....invest twenty or so bucks to find out what the computer thinks is happening here~

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