Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1990XT-6 4WD L6-2.7L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSSERVICE PRECAUTIONSVEHICLE DAMAGE WARNINGSPROPER TOOLS AND TESTING PROCEDURES
1990 Subaru XT-6 4WD L6-2.7L SOHC
Proper Tools and Testing Procedures
1990 Subaru XT-6 4WD L6-2.7L SOHCSECTION Proper Tools and Testing Procedures
WHEN TESTING A CONTROL UNIT OR RELATED ELECTRONIC COMPONENTS;
To obtain accurate measurements and to avoid damaging low voltage circuits and components, use a Digital Volt-Ohm Meter (DVOM) with a minimum 10 mega-ohms internal impedance (unless use of an analog meter is specified by a test procedure).
Analog meters have lower internal impedance and will "load" low voltage circuits, resulting in inaccurate measurements and possible damage to circuits and components.
TEST PROCEDURES
Always follow recommended testing procedures;
^ Never ground or apply voltage to a circuit unless specified by a testing procedure.
^ The control unit provides some circuits with a regulated, constant, low voltage source which may require a minimum resistance (impedance) to operate.
^ Directly grounding or applying battery power to these circuits could damage the control unit, causing system failure.
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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.