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HOMESERVICE MANUALSSUBARU1998FORESTER L, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETHEORY AND OPERATIONENGINE CONTROLS - THEORY & OPERATIONCOMPUTERIZED ENGINE CONTROLSELECTRONIC CONTROL MODULE (ECM)
1998 Subaru Forester L, Standard

Electronic Control Module (ECM)

1998 Subaru Forester L, StandardSECTION Electronic Control Module (ECM)

If a system malfunction occurs, a back-up system within ECM controls fuel and ignition system functions according to preprogrammed values (limp-in mode). This allows vehicle to be driven, but performance may not be optimal.

A self-diagnostic function allows ECM to store Diagnostic Trouble Codes (DTCs) in its memory. If a system fault occurs, Malfunction Indicator Light (MIL) will illuminate to inform driver of system problems and the appropriate DTC will be stored in memory. For further self-diagnostic system information, see TESTS W/CODES article in this section.

NOTE: Components are grouped into 2 categories. First category is INPUT DEVICES, which are components that control or produce signals monitored by ECM. Second category is OUTPUT SIGNALS, which are components controlled by ECM.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.