With Automatic Transaxle (ATX)

GENERAL SYSTEM OPERATION
The Powertrain Control System consists of various sensors, switches, Powertrain Control Module Engine (PCME) and Powertrain Control Module Transaxle (PCMT). The sensors and switches act as inputs to the Control Modules.

The sensors and switches (inputs) send the Control Modules data concerning engine and transaxle operating conditions. The Control Modules share and interpret this data in order to control various output devices. The output devices control air intake amounts, the amount of fuel injection, fuel injection timing, evaporative emissions, idle-up, deceleration, ignition timing, automatic transaxle (ATX) shifting and torque converter lockup operation. The Control Modules have varying amounts of control over these (outputs).

By controlling these outputs, the Control Modules can meet the different operational and driveability needs of the engine and transaxle as they experience different operating conditions and requirements.

Engine Control System 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

Engine Control System 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 lamp (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)