Dynasty L4-153 2.5L SOHC VIN K TBI (1992)
Engine Control Module: Description and Operation
General Operation
The PCM determines current engine operating conditions by interpreting inputs from various sensors and switches.
The PCM then actuates various output devices to achieve the best compromise between power, fuel consumption, and emissions.
MODES OF OPERATION
Open Loop Modes
Note:
In OPEN LOOP modes the PCM receives input signals and controls outputs according to preset programming. The PCM Ignores Oxygen
(HO2S) sensor input during OPEN LOOP modes.
- Ignition Switch ON (Zero RPM)
- Engine Start-Up
- Engine Warm-Up
- Wide Open Throttle (WOT)
- Ignition Switch OFF
- Limp In Mode
Closed Loop Modes
Note:
In CLOSED LOOP modes the PCM monitors the Oxygen Sensor (HO2S), input, and adjusts injector pulse width to compensate for operating
conditions.
- Warm Idle
- Cruise
- Acceleration (Except Wide Open Throttle)
- Deceleration
SELF DIAGNOSIS OPERATION
The PCM also monitors many of its input and output circuits for faults, and if a fault is detected:
