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.
1984 Subaru Brat AutomaticFACTORY OEM SERVICE PROCEDURE
ECC Diagnosis: Notes
Diagnosis of the ECC system is done in the following order:
- Ensure that all engine systems NOT related to ECC are fully operational. DO NOT proceed with testing unless you are sure that all other problems have been corrected.
- ECC diagnosis is performed in 2 modes: Regular mode and test mode. Most of the trouble codes can be activated in regular mode test. Some codes require that the test mode option be entered to activate display of codes. To enter test mode, the test mode connector must be connected together. See Fig 1
.NOTE: The test mode connector must not be connected together unless specific tests require that it be connected. Connector must be disconnected after performing any tests.
Factory Service Tools
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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.