MX-6 L4-1991cc 2.0L DOHC (1993)
constant, the PCME controls air/fuel ratio adjustments by varying injector "ON" time.
FAIL-SAFE MODE
To provide a margin of safety by maintaining driveability in the event of certain system failures, the PCME has a fail-safe mode of preprogrammed
values. PCME output will automatically switch to fail-safe mode if a fault is detected in any of these components and/or systems:
^ Crankshaft Position Sensor
^ Vehicle Speed Sensor
^ Airflow Sensor
^ Engine Coolant Temperature Sensor (CIS)
^ Engine Coolant Temperature Sensor (Fan)
^ Intake Air Temperature Sensor
^ Throttle Position Sensor
^ Barometric Atmospheric Presure Sensor
^ Heated Oxygen Sensor
^ Closed Loop System (Oxygen Sensor Output)
^ Vehicle Speed Pulse Generator (A/T)
^ ATF Thermosensor
^ A/T Control Solenoids
ON-BOARD DIAGNOSTICS
The system incorporates self-diagnostic capability monitored via a dash mounted malfunction indicator lamp (MIL). When the system detects a
fault in a monitored component and/or circuit, the lamp will light ("CHECK") and stay on (while engine is running), alerting the driver to seek
service. The technician can then extract trouble codes from the PCME to aid in the performance of efficient troubleshooting and repair.
Components can be grouped as PCME input and output devices. Not all devices are monitored by the on-board diagnostic system.
DECHOKE CONTROL SYSTEM
Facilitates starting should spark plugs become fouled, such as when engine is flooded.
If throttle valve is held wide open during cranking, fuel injection is cut, purging excess fuel from cylinders and allowing plugs to dry.