186
DTC 522699 Redundant Watchdog Failure
Conditions for Setting the DTC
Engine Control Module
Check Condition-Ignition ON
Fault Condition-Internal microprocessor error
MIL-On
Circuit Description
The ECM has several internal checks that must be satisfied each time an instruction is executed. Sev-
eral different things can happen within the microprocessor that will cause this fault. This diagnostic applies
to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic al-
so addresses if the ECM is not programmed or the program checksum does not match or has become
corrupted. Always verify that the ECM was flashed with the proper calibration files before using the follow-
ing diagnostic chat.
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