Question about 1993 Ford Ranger SuperCab

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On my 1993 ford ranger i ran a self Diagnostic on it and came up with error code 512 which is Keep alive memory test failed. Could someone explain in detail thanks in advance

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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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Instead of guessing as to what the problem is or expecting someone on here having a magical fix , take it to a qualified repair shop. Before assuming the worst an wanting to condem the PCM - powertrain control module . Will a scan tool communicate with it ? If your pulling codes it is .
DTC P0603 Control Module Long Term Memory Reset
The PCM has a memory area where it stores certain data it needs to save when the key is turned OFF. This area is called Keep Alive Memory. This diagnostic test monitors the PCM's keep alive memory for a loss or unintended change of data. If such a condition occurs, DTC P0603 will set.
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Have you disconnected the battery ?
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Ford Ranger/Explorer/Mountaineer 1991-1999
Clearing Codes

Print


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.


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REPLACED STEERING COLUM


You May need to Use The Old Ignition Lock & Key ,Due to the Chip In the Key.


Circuit Description

The PCM has a memory area where it stores certain data it needs to save when the key is turned OFF. This area is called Keep Alive Memory. This diagnostic test monitors the PCM's keep alive memory for a loss or unintended change of data. If such a condition occurs, DTC P0603 will set.

Conditions for Setting the DTC

Test Condition


Test continuously.

Failure Condition

Keep alive memory checksum does not match previous checksum.

Action Taken When the DTC Sets

  • Clear all keep alive memory locations.
  • The Malfunction Indicator Lamp (MIL) will not illuminate.
  • No message will be displayed.
Conditions for Clearing the DTC

  • A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
  • A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
  • PCM battery voltage is interrupted.
  • Using a Scan tool.
Diagnostic Aids

If the battery has been disconnected for any reason DTC P0603 will set. The PCM keeps a running check on the memory; if memory changes it resets. An intermittent loss of power or ground to the PCM will cause a reset.

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