Engine Controls - Self-Diagnostics: Overview Saab 9-5 I

SYSTEM OVERVIEW

Trionic engine management system uses an Electronic Control Module (ECM) located behind a partition on passenger side of engine compartment. (Scheme 1), (Scheme 3) or (Scheme 4).

If any monitored malfunction is detected by ECM, Malfunction Indicator Light (MIL) will display CHECK ENGINE on instrument cluster and a Diagnostic Trouble Code (DTC) may be stored in ECM memory. MIL may also be referred to as CHECK ENGINE light. DTCs can be retrieved or erased using a scan tool connected to Data Link Connector (DLC). See RETRIEVING DIAGNOSTIC TROUBLE CODES.

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

MALFUNCTION INDICATOR LIGHT (MIL) OPERATION

MIL illuminates with ignition switch in ON position. MIL should go off shortly after engine is started. If MIL does not illuminate, see MALFUNCTION INDICATOR LIGHT (MIL) INSPECTION.

See also:
• WIRING DIAGRAMS
• IGNITION DISCHARGE MODULE (IDM)
• FUEL INJECTORS
• TURBOCHARGER