Detection Condition
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
- DTC P0603 and P1605 indicates PCM has experienced a power interrupt in Keep Alive Power (KAPWR) circuit or an internal memory test failure. However, there are external items that can cause this DTC.
- DTC P0605 indicates PCM read only memory (ROM) has been corrupted.
- DTC P0606 indicates PCM internal communications error.
- DTC P1633 indicates KAPWR circuit has experienced a power interrupt.
- DTC P1639 indicates PCM programmable parameters are corrupted or not programmed correctly.
PCM receives information from a variety of sensor and switch inputs. Based on strategy and calibration stored within the memory chip, PCM generates an appropriate output. The system is designated to minimize emissions and optimize fuel economy and driveability.
Software Strategy
- Allows for Flash Electronically Erasable Programmable Read Only Memory (FEEPROM).
- Communicates through the Data Link Connector (DLC).
- Controls basic operation of engine and transaxle.
- Controls Failure Mode Effects Management (FMEM).
- Controls Malfunction Indicator Light (MIL).
- Provides idle air and fuel trim.
- Provides OBD-II strategy.