Join Date: Mar 2003
Location: Calgary, Alberta
Looked at the photo of your Stealth Vic, awsome looking!!
Well I'm not an expert by any means, but this go around has me starting to use the three letter codes like pro. Truth be known, I've picked up enough knowledge to be dangerous.
Powertrain Control Module (PCM)
PCM monitors engine operating conditions by inputs received from engine sensors. Control of output actuators determines fuel mixture and idle speed. The engine control system consists of the PCM, relays, modules, sensors, switches and actuators. The PCM sends out electrical reference signals to engine sensors and then analyzes the return signals. The engine sensors supply the PCM with specific information, in the form of electrical signals, to determine engine-operating conditions. In the event of a sensor or actuator failure, the PCM initiates an alternative strategy called Failure Mode Effects Management (FMEM) to allow the vehicle to remain driveability. The Malfunction Indicator Light (MIL), or Check Engine Light (CEL), will remain on whenever FMEM is in operation. FMEM substitutes a fixed sensor signal and continues to monitor the failed sensor. If signals from a faulty sensor return to within operating limits, PCM will resume using the sensor’s signal.
In my case the Idle Air Control failed and at the same time the IAC circuit within the PCM failed as well. For some reason the PCM was unable to detect these failures so the PCM did not generate any codes or to switch into FMEM mode.