DTC P0604, DTC P0606, DTC P0607 Or DTC P0657: Notes

WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

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 in GENERAL INFORMATION.

Code Definition

DTC P0604: Internal Control Module Random Access Memory (RAM) Error
DTC P0606: ECM/PCM Processor
DTC P0607: Control Module Performance
DTC P0657: Actuator Supply Voltage Circuit/Open