damaged PCM?
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damaged PCM?
I have a 94 f150 302 5 speed. My check engine light is one and giving me 11 codes (112, 117,122, 1266, 327, 513, 552, 553, 556, 558, 565,). I've removed the PCM and repaired 3 blown capacitors. This did not solve the issue. I've replaced the TPS sensor and ran diagnostics on the IAT sensor, MAP sensor, inspected the PCV, Idle air control sensor....none of these seem to be or fix the issue. Truck will start but idles incredibly rough, excessive gas consumption, can't get enough power to shift into second gear. Is my PCM fried? I'm out of ideas....Thanks in advance for any input
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Nobody could say for sure without hands on testing of your module but chances are other components on the circuit board have been damaged by the corrosive contents of those electrolytic caps.
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alright, in your opinion, would it be best to purchase a refurbished PCM replacement? and if i did, other than matching up the part number, is there any other useful information that goes into selecting a specific replacement or will the local auto part store have what i need?
FTE Chapter Leader
Joined: May 2006
Posts: 12,317
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From: Central Mississippi
These guys repaired my Fox's ECU for $161.49 & as long as I don't open it up, it has a lifetime warranty.
Had no problem for the last few months.
https://www.ebay.com/itm/1986-2004-M...ht_10477wt_758
They do ANY 12A650 engineering #
$89.99 if there is nothing wrong with it, & $13 if un-repairable.
Or there's always a Cardone unit form rockauto. I've gotten a couple of those which have done me fine, but seem to be a crap-shoot for some.
Had no problem for the last few months.
https://www.ebay.com/itm/1986-2004-M...ht_10477wt_758
They do ANY 12A650 engineering #
$89.99 if there is nothing wrong with it, & $13 if un-repairable.
Or there's always a Cardone unit form rockauto. I've gotten a couple of those which have done me fine, but seem to be a crap-shoot for some.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
code 513 is replace PCM (internal failure) If buying locally all I gave them was the code on the old PCM. Then read the description of it to make sure. I have bought two Cardone PCM's and they have been just fine. I went with O'Riley because they have a one year warranty and I can get a replacement in a day as opposed to sending it off. Not saying a PCM is your issue but it sure seems to be. Sandy
Fleet Mechanic
Joined: Aug 2011
Posts: 1,569
Likes: 258
code 513 is replace PCM (internal failure) If buying locally all I gave them was the code on the old PCM. Then read the description of it to make sure. I have bought two Cardone PCM's and they have been just fine. I went with O'Riley because they have a one year warranty and I can get a replacement in a day as opposed to sending it off. Not saying a PCM is your issue but it sure seems to be. Sandy
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
DTC 513 indicates that the internal voltage of the PCM is not in specification.
Possible causes:
-- Battery voltage is too low.
-- Damaged PCM.
Key on, engine off.
Measure voltage across battery terminals.
Is voltage greater than 10.5 volts?
Yes
REPLACE the PCM. RERUN «Quick Test».
No
SERVICE discharged battery. REFER to Charging/Electrical Group in Service Manual. RERUN «Quick Test».
Possible causes:
-- Battery voltage is too low.
-- Damaged PCM.
Key on, engine off.
Measure voltage across battery terminals.
Is voltage greater than 10.5 volts?
Yes
REPLACE the PCM. RERUN «Quick Test».
No
SERVICE discharged battery. REFER to Charging/Electrical Group in Service Manual. RERUN «Quick Test».
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New User
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replaced the old PCM with a referbished one from NAPA. Truck is running like its previous self. thanks all for the advice and responses
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