DTC P0604, DTC P0606, DTC P0607 Or DTC P0657: Notes
WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
Code Definition
- P0604: Internal Control Module Random Access Memory (RAM) Error
- P0606: ECM/PCM Processor
- P0607: Control Module Performance
- P0657: Actuator Supply Voltage Circuit/Open
NOTE:
For information on engine immobilizer system, see COMPUTERIZED ENGINE CONTROLS
in THEORY & OPERATION article.
CAUTION:
If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES - LEXUS
article.