Powertrain Control Module
WARNING: This page is about a different car, the 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Powertrain control module (PCM) receives information from various input devices and TCM through Controller Area Network (CAN). PCM monitors transaxle operation and contains a self-diagnostic system which will store Diagnostic Trouble Codes (DTC) if a failure or problem exists in electronic control system. If a problem exists, a DTC is set and PCM will deliver a signal to illuminate Malfunction Indicator Light (MIL), and/or O/D OFF indicator on instrument panel to warn driver. If either MIL or O/D OFF indicators are illuminated, stored DTCs can be retrieved to determine problem area. See SELF-DIAGNOSTIC SYSTEM . PCM is located behind glove compartment. PCM and TCM are mounted together.