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.
1991 Geo Tracker LSi, AutomaticFACTORY OEM SERVICE PROCEDURE
EFI Main Relay
NOTE:
The EFI main relay may be referred to as the main relay.
- The EFI main relay is mounted on the ECM, located under left side of instrument panel, near kick panel. See Fig 1 . Disconnect electrical connector from EFI main relay.
- Using ohmmeter, ensure continuity exists between Black/White wire and Blue wire terminals of EFI main relay. Apply battery voltage to Black/White wire terminal and ground Blue wire terminal. Continuity should exist between Black/Red and Blue/Black wire terminals. Replace EFI main relay if continuity is not as specified.
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.
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