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HOMESERVICE MANUALSSUBARU1990XT-6 4WD L6-2.7L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONSYSTEM DESCRIPTION
1990 Subaru XT-6 4WD L6-2.7L SOHC

System Description

1990 Subaru XT-6 4WD L6-2.7L SOHCSECTION System Description

Computerized Engine Controls:





PURPOSE
The vehicle ECU and sensor and output systems control virtually all aspects of engine operation. This combined control allows the engine to function at optimum performance while maintaining exceptable emission and fuel economy levels.

OPERATION
During normal vehicle operation, the ECU controls fuel, spark and emission systems. In the event of a sensor failure or inconsistency the unit switches to "Fail-Safe" mode. In this mode, certain sensor and output parameters become "fixed" allowing limited operation of the vehicle. In most cases the "Check Engine" lamp is illuminated and trouble codes are recorded in the ECU long term memory. These alert the operator that a system requires attention and guides the technician towards the failed system.

RENDER: 1.0x

NO RELATED

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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.