Engine Control Module: Notes
See PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article and ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS in ELECTRICAL for ECM connector and wire terminal identification.
Engine Control Module (ECM) monitors system inputs and controls system outputs accordingly to obtain optimal fuel economy and engine performance, while maintaining acceptable exhaust emission levels. In event of an input or output failure, ECM will memorize and store information as a Diagnostic Trouble Code (DTC). DTCs can be used by technician to diagnose various driveability and emission related problems. DTCs are accessed through On-Board Diagnostics II (OBD II) Data Link Connector (DLC) with use of a Suzuki scan tool or other OBD II compatible scan tool. DLC is located under instrument panel, accessible from driver's side. See Fig 1 .
ECM incorporates a fail-safe (limp-in) mode. If a fault occurs during vehicle operation, ECM will substitute a predetermined value and/or signal for continued operation. Driving performance will be affected, but vehicle may still be driven. When ECM detects a system fault, Malfunction Indicator Light (MIL) will flash or illuminate steadily to notify driver of a developing problem.