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Keep Alive Power voltage too low??

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  #1  
Old 11-09-2002, 03:51 AM
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Join Date: Jan 2001
Location: Pearland, TX USA
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Unhappy Keep Alive Power voltage too low??

I have a '01 Screw w/ 55K miles. Recently the Service Engine Soon light came on and stayed on for a week. Autozone read this code P1633 which means "Keep alive power voltage too low."
No one there knew what this code meant nor did they have a service manual for my vehicle. Would someone translate this and tell me the best solution for this problem??
Thanks...
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  #2  
Old 11-10-2002, 12:20 AM
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Join Date: Jun 2002
Location: Under the flightpath of old ORD 22R
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From the Ford 2001 Service Manual

DTC : P1633 - Keep Alive Power Voltage Too Low
Description :
Indicates that the Keep Alive Power (KAPWR) circuit has experienced a power interrupt.

Possible Causes :
Open KAPWR circuit
Damaged PCM
Intermittent KAPWR Circuit

Diagnostic Aides :
None

This is from the Service manual, I have not seen this myself, nor do I know how well the poss causes are.

The only part I see in the electrical diagram for the KAPWR ckt is on pg 25-9, the PCM. It is pin 55 ckt 729 red / white stripe.
If you don't know the PCM is located under the hood, pass. side, between the firewall, and the battery ( page 151-21, C174 )..
Sounds like something serious to me, the electrical manual gives no additional wiring locations for this, so it might be internal to the PCM.

Sorry it might not be much help.

Good luck

Good luck.

Last edited by SSCULLY; 11-10-2002 at 12:33 AM.
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  #3  
Old 10-01-2008, 12:03 AM
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Join Date: Sep 2008
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i have a 2001 ford f-150 with engine light on. p1633. i tried a couple mechanics but know one has a clue how to fix it. its a vehicle with flood damage and has over 100k miles. does any one maybe have a solution to this problem. i checked the battery and some other minor things. help would be appreciated! thanks
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  #4  
Old 11-02-2015, 12:54 AM
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Join Date: Nov 2015
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PCM, P1633, fuse 2, 5 amp

I bought a used 03, the 4.6 with 87,000 miles. The code came up within a week of the sale. After reading the code I went back to the dealer and didn't get much help. So I dug in and read everything online. Sscully is correct it is pin 55 and the wire is red with a white stripe at the pcm connector. There was another post someplace, I think it was a mustang form, but somebody said to check the thru firewall connectors on the driver side. There are 3 and the poster said to look at the bottom one. 6 inches up that harness i noticed a sharp bend in the harness at the bracket for the power distribution box. Also someone had been in there before me because I noticed the harness had been taped back together. Thats where the short was. The wire was separated/burnt so it was an easy one to find, red with a thin white stripe. Someone put a 20 amp fuse in the number 2 spot.
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