The power control module (PCM) is the main on-board computer for the Ford Freestar. The PCM controls the engine and transmission management systems on the minivan. As the spark plugs break down over time, the PCM undergoes an adaptive strategy to optimise the Freestar's performance under less than optimal conditions. Once you've replaced the spark plugs, you'll need to reset the PCM in order for the Freestar to return to normal operating conditions. If you have a scan tool, you can clear the PCM's adaptive strategy during a quick test; however, you can also perform the reset by simply disconnecting the battery.
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Things you need
- Battery wrench
Open the Freestar's bonnet and support it with the prop rod.
Disconnect the negative battery cable from the battery with your battery wrench.
Reconnect the negative battery cable to the battery after one hour or more has passed.
The power control module for your Ford Freestar is now reset.
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