With Automatic Transaxle (ATX)

PURPOSE
The heart of the engine control system is the powertrain control module engine (PCME).
The PCME receives input signals from a series of sensors, makes computations based on these inputs, and sends (output) signals to various devices which control functions such as air/fuel mixture, ignition timing, and certain emission control devices. On automatic transaxle (ATX) equipped vehicles, the PCME also receives inputs from the powertrain control module, transaxle (PCMT).

PCME Inputs
- Air conditioning sensor.
- Barometric absolute pressure sensor
- Braking signal (Stop light switch)
- Crankshaft position sensor No.1 SGC & SGT signals (in distributor)
- SGC signal represents TDC for cylinders No.1 & No.4
- SGT signal represents crankshaft angle in 60° intervals
- Crankshaft position sensor No.2 NE signal (near crank pulley)
- NE signal also represents crankshaft angle in 60° intervals
- Data link connector TEN terminal (initial set signal, for self diagnosis initiation)
- E/L operation (represents electrical load)
- Coolant fan relay
- Headlights
- Blower motor
- Rear window defroster
- EGR function sensor
- Engine coolant temperature sensor
- Heated oxygen sensors
- Ignition switch
- START position signal
- ON position signal
- Intake air temperature sensor (in volume airflow sensor)
- Knock sensor
- Park/Neutral Position Switch (ATX)
- Steering pressure sensor
- Throttle position sensor
- Throttle valve opening (TVO) signal
- Idle switch (closed throttle position signal)
- Transaxle operation signals (from ATX powertrain control module transaxle)
- Vehicle speed sensor (signal buffer)
- Volume airflow sensor

PCME Outputs
- Air conditioner relay (A/C cut off)
- Coolant fan relay
- Condenser fan relay
- Data link connector terminals:
- FEN (output to self diagnosis checker)
- MEN (output from switch monitor function and heated oxygen sensors)
- IG tachometer signal
- EGR control system (EGR solenoid valves)
- Malfunction indicator light (MIL) (output to malfunction indicator light)
- Fuel injectors
- Fuel pump relay
- Idle speed control system (idle air control valve)
- Igniter (ignition system control)
- Powertrain control module transaxle (engine coolant temperature signal)
- Purge control system (purge solenoid valve)
- Pressure regulator control (PRC) system (PRC solenoid valve)
- Variable resonance induction system (VRIS) (VRIS solenoid valves)