CODE P1633

Tiny
CBSANJUAN
  • MEMBER
  • 2004 FORD TAURUS
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 75,000 MILES
I have a 2004 Ford Taurus (DOHC Engine). Recently, I blew a fuse, located in the engine compartment. My OBDII scanner read a DTC P1633 (Keep Alive memory voltage too low) and a freeze frame data.
.
Fuel System 1 OL
Fuel System 2 CL-Fault
.
The fuse that blew up, Fuse 22, serves the AC clutch relay, Idle Air Control valve and VBATT (vehicle battery supply) for the PCM (power control module). I already replaced the IAC and have isolated the AC circuit and still, the fuse kept blowing up. I also checked for short-circuit in wires and found wires are good.

Does anyone knows what the above freeze frame data means?

I am certain that the PCM is intermittently pulling in high current. If I replace the fuse, I can drive the car and the PCM will clear self tests then all of a sudden, the fuese will blow again.

. My next step is to replace the PCM. But it's quite expensive ($800.). I am not sure if the fault is inside PCM or outside. I want to confirm that PCM is bad. Any suggestion. Thank you.
Thursday, December 27th, 2007 AT 6:08 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Freeze Frame Data -you have a fuel loopng control problem see below

FUEL STAT 1 = Fuel System 1 Status: Fuel system status will display more than just Closed Loop (CL) or Open Loop (OL). You might find one of the following messages: OL-Drive, indicating an open-loop condition during power enrichment or deceleration enleanment; OL-Fault, indicating the PCM is commanding open-loop due to a system fault; CL-Fault, indicating the PCM may he using a different fuel control strategy due to an oxygen sensor fault.

Hope this helps
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Friday, December 28th, 2007 AT 2:11 AM
Tiny
WILL SHAFFER
  • MEMBER
  • 1 POST
Dealing with the same problem on a friends car. Would like to know if and how you fixed this.
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Saturday, August 18th, 2018 AT 12:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,245 POSTS
Usually this code comes up when you have a bad battery or bad connection. Here are two guides that should help:

https://www.2carpros.com/articles/car-battery-load-test

and

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Please run down these guides and report back.

Cheers, Ken
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Saturday, August 18th, 2018 AT 6:14 PM

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