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.

1989 Geo Tracker Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Aids

Code 31 will be stored if circuit No. 469 is open or if circuit No. 432 is shorted to voltage or to circuit No. 416. If Code 31 is intermittent, see TESTS W/O CODES article.

Fig 1: Code 31, Circuit Wiring Diagram & Flow Chart

Courtesy of GENERAL MOTORS CORP.

Chapter Navigation

Return to Chapter: Code 31, Map Signal High

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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.