With With Automatic Transmission
DESCRIPTION
The 5E-FE engine is equipped with a Toyota Computer Controlled System (TCCS) which centrally controls the Multiport Electronic Fuel Injection (EFI) System, Electronic Spark Advance (ESA), Transmission Control System, Diagnosis systems etc. by means of an Engine Control Module (ECM) employing a microcomputer.
OPERATION
ELECTRONIC ENGINE CONTROL SYSTEM
PTM System Connections - Schematic View:
Multiport Electronic Fuel Injection (EFI)
The ECM receives signals from various sensors indicating changing engine operating conditions such as intake manifold pressure, intake air temperature, engine coolant temperature, engine speed and exhaust oxygen content.
The signals are utilized by the ECM to determine the injection duration necessary for an optimum air-fuel ratio.
Electronic Spark Advance (ESA)
The ECM is programmed with data for optimum ignition timing under all operating conditions.
Using data provided by sensors which monitor various engine functions (RPM, ECT, etc.), the ECM triggers the spark at precisely the right instant.
Exhaust Gas Recirculation (EGR) System
The ECM, based on engine speed, load and coolant temperature, controls the Vacuum Switching Valve (VSV) which passes or blocks vacuum to the Exhaust Gas Recirculation valve.
"CHECK" ENGINE LAMP Or Malfunction Indicator Light Location:
Diagnostic
The ECM detects any malfunctions and abnormalities in the sensor network and lights a Malfunction Indicator Lamp (MIL) in the combination meter. At the same time, trouble is identified and a Diagnostic Trouble Code (DTC) is recorded by the ECM. The DTC can be read by the number of blinks of the MIL when terminals TE1 and E1 of the Data Link Connector 1 (DLC1) are connected.
Self-Correction Function
If any sensor malfunctions, an average value recorded in the back-up circuit is substituted to make driving possible. If danger is predicted, the engine is stopped and the MIL will light up.
Fail-Safe Function
In the event of certain ECM malfunctions, a back-up circuit (or "limp home mode") will take over to provide minimal driveability, and the MIL will illuminate.
TRANSMISSION ELECTRONIC CONTROL SYSTEM
Shift Control
The electronic control system for the A244E automatic transaxle provides extremely precise control of the shift timing and lock-up timing in response to driving conditions and engine running conditions as sensed by various sensors. ECM control also reduces vehicle squat and gear shift shock.
Read ECT Diagnostic Codes Using The O/D OFF Light:
Diagnostic
The electronic control system also contains a self diagnosis system which records abnormalities in the vehicle Speed Sensor (SPD) and control solenoid circuits. The "O/D OFF" light on the dash will illuminate, even when the Overdrive Switch is set to ON, to indicate the presence of a fault code.
Fail-Safe Function
Additionally, a fail-safe mode is provided by means of a back-up circuit to allow minimal driving operation in the event of a malfunction.