Question about 1993 Ford Ranger SuperCab
Keep alive memory is required to save all the adjustments the coputer has made to compensate for engine wear/drive habbits/altitude/fuel system problems like vac leaks etc.
there is a base program in the read only memory that cant be erased by loosing power to computer this program is designed to start and run a brand new vehicle good enough to let it make its minor adjustments as it sees fit.sort of like an electronic fine tune.
that code you have means the coomputer is loosing its power supplie it needs to keep the random acces memory from being erased.
check the fuse ALL fuses some fuses feed other fuses they are not labeled as such on the fuse boxes.i would go for the cig lighter fuse first but like i said check them all.if no blown fuses then your gonna have to trace keep alive memory [or b+]wire from computer on back untill you find the broken wire etc.could even be a bad computer but i dought it
Posted on May 09, 2010
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Posted on Jan 02, 2017
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Ford Ranger/Explorer/Mountaineer 1991-1999
CONTINUOUS MEMORY CODES
These codes are retained in memory for 40 warm-up cycles. To clear the codes for the purposes of testing or confirming repair, perform the code reading procedure. When the fault codes begin to be displayed, de-activate the test by either disconnecting the jumper wire (meter, MIL or message center) or releasing the test button on the hand scanner. Stopping the test during code transmission will erase the Continuous Memory. Do not disconnect the negative battery cable to clear these codes; the Keep Alive memory will be cleared and a new code, 19, will be stored for loss of PCM power.
KEEP ALIVE MEMORY
The Keep Alive Memory (KAM) contains the adaptive factors used by the processor to compensate for component tolerances and wear. It should not be routinely cleared during diagnosis. If an emissions related part is replaced during repair, the KAM must be cleared. Failure to clear the KAM may cause severe driveability problems since the correction factor for the old component will be applied to the new component.
To clear the Keep Alive Memory, disconnect the negative battery cable for at least 5 minutes. After the memory is cleared and the battery reconnected, the vehicle must be driven at least 10 miles so that the processor may relearn the needed correction factors. The distance to be driven depends on the engine and vehicle, but all drives should include steady-throttle cruise on open roads. Certain driveability problems may be noted during the drive because the adaptive factors are not yet functioning
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