ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-188
(16) Internal Processor Diagnostics (DTC 601, 604, 606, 1612 to 1616, 1673)
DTC 601-Microprocessor Failure-FLASH
• Hardware: Engine Control Module-Flash Memory
• Enabling Conditions: Key on
• Set Conditions: Internal microprocessor error
• Corrective Action(s): Illuminate MIL, disable fuel adaptive learn for remainder of key cycle, activate power derate
2 and never forget code (code must be manually erased by technician with DST)
• Non-emissions related fault
• Possible Causes: Faulty ECM
The ECM has checks that must be satisfied each time an instruction is executed. Several different things can
happen within the microprocessor that will cause this fault.
If this fault sets, the ECM will reset itself and log the code. A fault of flash memory can occur for any calibration
variable set and thus could cause undesirable operation.
DTC 604-Microprocessor Failure-RAM
• Hardware: Engine Control Module-Random Access Memory
• Enabling Conditions: Key on
• Set Conditions: Internal ECM microprocessor memory access failure
• Corrective Action(s): Illuminate MIL, disable fuel adaptive learn for remainder of key cycle, activate power derate
2 and never forget code (code must be manually erased by technician with a DST)
• Non-emissions related fault
• Possible Causes: Faulty ECM
Random Access Memory is located within the microprocessor and can be read from or written to at any time. Data
stored in RAM include DTCs (when fault configuration is set to "Battery Power Retained"), adaptive fuel learn tables,
octane adaptation table, misfire adaptaion tables, and closed loop fuel multipliers. The ECM has checks that must be
satisfied each time an instruction is executed.
This fault will set if the ECM detects a problem accessing or writing information to RAM. If this fault sets, the ECM
will reset itself and log the code. This fault should be erased by a technician after diagnostics are performed.
DTC 606-Microprocessor Failure-COP
• Hardware: Engine Control Module
• Enabling Conditions: Key on
• Set Conditions: Internal microprocessor error
• Corrective Action(s): Illuminate MIL, disable fuel adaptive learn for remainder of key cycle, activate power derate
2 and never forget code (code must be manually erased by technician with a DST)
• Non-emissions related fault
• Possible Causes: Faulty ECM
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