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.

1997 Geo Tracker LSi, RWDFACTORY OEM SERVICE PROCEDURE

Powertrain Control Module (Pcm)

NOTE: See PIN VOLTAGE CHARTS article and appropriate wiring diagrams in WIRING DIAGRAMS article for PCM connector and wire terminal identification.

PCM is located under left side of instrument panel. On models with manual transmission, PCM power is sent from main relay to PCM connector "C", terminals No. 12 and 13. PCM backup power is received from fuse box to PCM connector "C", terminal No. 1. On models with automatic transmission, PCM power is sent from main relay to PCM connector "A", terminals No. 3 and 16. PCM backup power is received from fuse box to PCM connector "A", terminal No. 4.

NOTE: Components are grouped into 2 categories. First category is INPUT DEVICES, which are components that control or produce voltage signals monitored by PCM. Second category is OUTPUT SIGNALS, which are components controlled by PCM.

Chapter Navigation

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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.