DTC P0604, DTC P0606, DTC P0607 Or DTC P0657: Notes
WARNING: This page is about a different car, the 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
Code Definition
- DTC P0604: Internal Control Module Ram Error
- DTC P0606: ECM/PCM Processor
- DTC P0607: Control Module Performance
- DTC P0657: Actuator Supply Voltage Circuit/Open
CAUTION:
If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. On models equipped with engine immobilizer, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES - TOYOTA
article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.