Freestar V6-4.2L VIN 2 (2004)
The ETC monitor system is distributed across two processors within the PCM: the main powertrain control processor unit (CPU) and a monitoring
processor called an Enhanced-Quizzer (E-Quizzer) processor. The primary monitoring function is performed by the Independent Plausibility Check
(IPC) software, which resides on the main processor. It is responsible for determining the driver-demanded torque and comparing it to an estimate of
the actual torque delivered. If the generated torque exceeds driver demand by specified amount, the IPC takes appropriate mitigating action.
ETC System Failure Mode And Effects Management, Part 1
ETC System Failure Mode And Effects Management, Part 2
Since the IPC and main controller share the same processor, they are subject to a number of potential, common failure modes. Therefore, the
E-Quizzer processor was added to redundantly monitor selected PCM inputs and to act as an intelligent watchdog and monitor the performance of the
IPC and the main processor. If it determines that the IPC function is impaired in any way, it takes appropriate Failure Mode and Effects Management
(FMEM) actions.
Electronic Throttle Monitor Operation:
