Scanner tool won't connect to PCM when engine off - Kia Forum
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#1 (permalink) Old 09-06-2011, 07:20 AM
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Default Scanner tool won't connect to PCM when engine off

Scanner tool OBO 11 instructions read Turn key to on position but ( Don't) start engine, I get no codes and it keeps tring to complete a scan but can't every 15 sec ? When i start engine I get a PO560 code ? Any ideas. Thanks
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#2 (permalink) Old 09-06-2011, 09:28 AM
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mcdee...
We ask you fill out the "cp" section about yourself so we can base our answers on your location, year, engine type (gas/diesel), weather. As a mod I see you are around Winnipeg, Manitoba. Canada...so that's a start. Pretty common is problems with wiring corrosion. Ground wire from battery to frame of car or more common the wiring from the positive terminal of the battery to the under hood fuse box, Check UNDER the fuse box for corroded connections. The code P0560 relates to "system voltage problem" meaning "probably" low voltage going to the ECM (engine control module). The ECM cannot/will not operate with low battery voltage. A corroded connection will act like a resistor in a circuit and low voltage may result. These can be very intermittent and cause all kinds of problems. If you find bad connections from corrosion you will need to clean off the oxidation and then apply silicon grease (get at auto parts store) to keep the oxidation from re-occurring.
Be sure to check the ground wires from the ECM to the body/frame of the car. They can be located under the sloped section of the front carpet/mats and/or behind the foot kick panels.
Good Luck and keep us posted on what you find.
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#3 (permalink) Old 09-08-2011, 08:04 AM
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Default 2004 kia optima 2.4

All grounds seem fine ? No rust or corrosion anyhwere .( Florida Car) . PO560 code still coming up . Cleared code but when i shut down engine and restarted it Service engine light came back on ? RPM's are a little high at idle in neutral when warmed up (1100)
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#4 (permalink) Old 09-08-2011, 08:31 AM
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What are the battery voltages (across the (+) and (-) terminals with the engine off and with the engine on and at idle? P0560 is saying the system voltages are incorrect. The battery may have a bad cell or the alternator may be putting out lower than normal voltage. The scanner and the ECM are probably not getting enough voltage to function properly and the ECM is setting the code and engine light.
Being a Florida car means it may have been subject to salt water (or salt in the air) and again possible corrosion. You may have a bad ECM but it seems unlikely.
I'm about out of ideas..I hope someone else can chip in..
Dave
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#5 (permalink) Old 09-08-2011, 10:07 AM
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Might be that 120 amp alternator fuse that sits right next to my + on my battery ! Can't pull it out ? Must be melted in place ? I'll test voltage . Thanks
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#6 (permalink) Old 09-12-2011, 02:51 PM
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Problem solved ! Was a faulty 120 amp alternator fuse on the positive battery post . Cleared the code PO560 with the scanner and no more service engine light flashing .
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