Clearing Codes; Continuous Memory Codes; Keep Alive Memory; Diagnostic Trouble Code Charts - Ford Ranger Maintaince And Repair Manual

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Clearing 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.

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.

Clearing Codes

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