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.
1990 Geo Tracker Base, StandardFACTORY OEM SERVICE PROCEDURE
Chart A-8, Control Relay Circuit Check
The control relay is involved in many of the circuits that the ECM uses to control the starting of the vehicle. The fuel pump circuit and the starter operation depend on the function of the control relay.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- This test checks on the ignition side of the control relay.
- This test checks the ECM and fuel pump circuit.
NOTE:
For circuit schematic, see Figure
.
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.