Powertrain Control Module
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The PCM has a "learning" ability which allows it to make minor corrections for fuel system variations. PCM is mounted on top radiator support. See Fig 1 . If battery power is interrupted, a vehicle performance change may be noticed. PCM module corrects itself, and normal performance returns if vehicle is allowed to "relearn" optimum control conditions. "Relearning" occurs when vehicle is driven at normal operating temperature under part throttle, moderate acceleration and idle conditions.