Possible Causes
Faulty Powertrain Control Module (PCM)
Powertrain Control Module (PCM) Harness is open or shorted
Powertrain Control Module (PCM) Circuit poor electrical connection
Powertrain Control Module (PCM) outdated program
الأسباب المحتملة
Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
الأعراض المحتملة
Description
The Powertrain Control Module (PCM) has a built-in ignition off timer that measures the duration of time from ignition off to the next ignition on. The measured duration is used for evaporative emission (EVAP) leak detection and temperature assumption of the catalytic converter. The CPU in the PCM accesses the ignition off timer when reading the measured duration. When the access process fails, a malfunction is detected and a DTC is stored. When an abnormality is found in the read data, a malfunction is detected and a DTC is stored.
